ENVIROGEN INC
SC 13D, 1997-04-18
HAZARDOUS WASTE MANAGEMENT
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<PAGE>

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934



                                 Envirogen, Inc.
         -------------------------------------------------------------
                                (Name of Issuer)


                          Common Stock, par value $.01
         -------------------------------------------------------------
                         (Title of Class of Securities)


                                    294040100
         -------------------------------------------------------------
                      (CUSIP Number of Class of Securities)


                               Reuben S. Leibowitz
                         E.M. Warburg Pincus & Co., LLC
                              466 Lexington Avenue
                            New York, New York 10017
                                 (212) 878-0600
         -------------------------------------------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                   Copies to:

                                Steven J. Gartner
                            Willkie Farr & Gallagher
                              153 East 53rd Street
                               New York, NY 10022
                                 (212) 821-8000

                                 April 10, 1997
         -------------------------------------------------------------
                         (Date of Event which Requires
                            Filing of this Schedule)

                  If the filing person has previously filed a statement on
         Schedule 13G to report the acquisition which is the subject of this
         Schedule 13D, and is filing this schedule because of Rule 13d-1(b)(3)
         or (4), check the following: |_|

                  Check the following box if a fee is being paid with this
         statement:







<PAGE>


                                  SCHEDULE 13D



- -------------------------------                 --------------------------------
CUSIP No.  294040100                             Page _____ of ____ Pages
           ---------
- -------------------------------                 --------------------------------


- --------------------------------------------------------------------------------
 1   NAME OF REPORT PERSON
     S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

     Warburg, Pincus Ventures, L.P.                I.D. #13-3784037
- --------------------------------------------------------------------------------
 2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                  (a) [ ]
                                                                       (b) [X]

- --------------------------------------------------------------------------------
 3   SEC USE ONLY

- --------------------------------------------------------------------------------
 4   SOURCE OF FUNDS*

     WC
- --------------------------------------------------------------------------------
 5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDING IS REQUIRED PURSUANT TO
     ITEMS 2(d) or 2(e)   [ ]
- --------------------------------------------------------------------------------
 6   CITIZENSHIP OR PLACE OF ORGANIZATION

     Delaware
- --------------------------------------------------------------------------------
                7   SOLE VOTING POWER
                    0 shares of Common Stock
               -----------------------------------------------------------------
  NUMBER OF     8   SHARED VOTING POWER
   SHARES
BENEFICIALLY        6,095,238 shares of Common Stock
  OWNED BY     -----------------------------------------------------------------
    EACH        9   SOLE DISPOSITIVE POWER
 REPORTING          0 shares of Common Stock
PERSON WITH    -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER
                    6,095,238 shares of Common Stock
- --------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH PERSON

     6,095,238 shares of Common Stock
- --------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
     CERTAIN SHARES*  [ ]

- --------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

     26.3%
- --------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     PN
- --------------------------------------------------------------------------------


                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
      (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.


<PAGE>



                                 SCHEDULE 13D



- -------------------------------                 --------------------------------
CUSIP No.  294040100                             Page _____ of ____ Pages
           ---------
- -------------------------------                 --------------------------------


- --------------------------------------------------------------------------------
 1   NAME OF REPORT PERSON
     S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

     Warburg, Pincus & Co.                   I.D. #13-6358475
- --------------------------------------------------------------------------------
 2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                  (a) [ ]
                                                                       (b) [X]

- --------------------------------------------------------------------------------
 3   SEC USE ONLY

- --------------------------------------------------------------------------------
 4   SOURCE OF FUNDS*

     N/A
- --------------------------------------------------------------------------------
 5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDING IS REQUIRED PURSUANT TO
     ITEMS 2(d) or 2(e)   [ ]
- --------------------------------------------------------------------------------
 6   CITIZENSHIP OR PLACE OF ORGANIZATION
     New York
- --------------------------------------------------------------------------------
                7   SOLE VOTING POWER
                    0 shares of Common Stock
               -----------------------------------------------------------------
  NUMBER OF     8   SHARED VOTING POWER
   SHARES
BENEFICIALLY        6,095,238 shares of Common Stock
  OWNED BY     -----------------------------------------------------------------
    EACH        9   SOLE DISPOSITIVE POWER
 REPORTING          0 shares of Common Stock
PERSON WITH    -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER

                    6,095,238 shares of Common Stock
- --------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH PERSON

     6,095,238 shares of Common Stock
- --------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
     CERTAIN SHARES*    [ ]

- --------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

     26.3%
- --------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     PN
- --------------------------------------------------------------------------------


                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
      (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.


<PAGE>



                                 SCHEDULE 13D



- -------------------------------                 --------------------------------
CUSIP No.  294040100                             Page _____ of ____ Pages
           ---------
- -------------------------------                 --------------------------------


- --------------------------------------------------------------------------------
 1   NAME OF REPORT PERSON
     S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

    E.M. Warburg, Pincus & Co., LLC         I.D. #13-3536050
- --------------------------------------------------------------------------------
 2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                  (a) [ ]
                                                                       (b) [X]

- --------------------------------------------------------------------------------
 3   SEC USE ONLY

- --------------------------------------------------------------------------------
 4   SOURCE OF FUNDS*

     N/A
- --------------------------------------------------------------------------------
 5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDING IS REQUIRED PURSUANT TO
     ITEMS 2(d) or 2(e)   [ ]
- --------------------------------------------------------------------------------
 6   CITIZENSHIP OR PLACE OF ORGANIZATION
     New York
- --------------------------------------------------------------------------------
                7   SOLE VOTING POWER
                    0 shares of Common Stock
               -----------------------------------------------------------------
  NUMBER OF     8   SHARED VOTING POWER
   SHARES
BENEFICIALLY        6,095,238 shares of Common Stock
  OWNED BY     -----------------------------------------------------------------
    EACH        9   SOLE DISPOSITIVE POWER
 REPORTING          0 shares of Common Stock
PERSON WITH    -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER

                    6,095,238 shares of Common Stock
- --------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH PERSON

     6,095,238 shares of Common Stock
- --------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
     CERTAIN SHARES*   [ ]

- --------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

     26.3%
- --------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     OO
- --------------------------------------------------------------------------------


                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
      (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.






<PAGE>


    This Schedule 13D is being filed on behalf of Warburg, Pincus Ventures,
L.P., a Delaware limited partnership ("Ventures"), Warburg, Pincus & Co., a New
York general partnership ("WP"), and E.M. Warburg, Pincus & Co., LLC, a New York
limited liability company ("EMW"), relating to the common stock, par value $.01
per share (the "Common Stock"), of Envirogen, Inc., a Delaware corporation (the
"Company"). Of the Reporting Entities (as defined below), only Ventures has
acquired direct ownership of the Common Stock.

Item 1. Security and Issuer.

    This statement on Schedule 13D relates to the Common Stock, par value $.01
per share, of the Company, and is being filed pursuant to Rule 13d-1 under the
Securities Exchange Act of 1934, as amended (the "Exchange Act"). The address of
the principal executive offices of the Company is Princeton Research Center,
4100 Quakerbridge Road, Lawrenceville, NJ 08648.

Item 2. Identity and Background.

    (a) This statement is filed by Ventures, WP and EMW. The sole general
partner of Ventures is WP. EMW manages Ventures. Lionel I. Pincus is the
managing partner of WP and the managing member of EMW and may be deemed to
control both WP and EMW. WP has a 15% interest in the profits of Ventures as the
general partner, and also owns approximately 1.5% of the limited partnership
interests in Ventures. Ventures, WP and EMW are hereinafter collectively
referred to as the "Reporting Entities."





                                      -4-



<PAGE>




The general partners of WP and the members of EMW are described in Schedule I
hereto.

    (b) The address of the principal business and principal office of each of
the Reporting Entities is 466 Lexington Avenue, New York, New York 10017.

    (c) The principal business of Ventures is that of a partnership engaged in
making venture capital and related investments. The principal business of WP is
acting as general partner of Ventures, Warburg Pincus Investors, L.P., Warburg,
Pincus Capital Company, L.P. and Warburg, Pincus Capital Partners, L.P. The
principal business of EMW is acting as manager of Ventures, Warburg, Pincus
Investors, L.P., Warburg, Pincus Capital Company, L.P. and Warburg, Pincus
Capital Partners, L.P.

    (d) None of the Reporting Entities, nor, to the best of their knowledge, any
of the directors, executive officers, general partners or members referred to in
paragraph (a) has, during the last five years, been convicted in a criminal
proceeding (excluding traffic violations or similar misdemeanors).

    (e) None of the Reporting Entities nor, to the best of their knowledge, any
of the directors, executive officers, general partners or members referred to in
paragraph (a) above has, during the last five years, been a party to a civil
proceeding of a judicial or administrative body of competent jurisdiction and as
a result of such proceeding was or is subject to a judgment, decree or final
order enjoining future violations of, or prohibiting or





                                      -5-



<PAGE>



mandating activities subject to, federal or state securities laws or finding any
violation with respect to such laws.

    (f) Except as otherwise indicated on Schedule I hereto, each of the
individuals referred to in paragraph (a) above is a United States citizen.

Item 3.  Source and Amount of Funds or Other Consideration.

    The total amount of funds required by Ventures to purchase the Shares (as
defined below), pursuant to the Purchase Agreement described in Item 4, was
$15,999,999.75, and was furnished from the working capital of Ventures.

Item 4.  Purpose of Transaction.

    On January 14, 1997, the Company entered into a Stock Purchase Agreement
(the "Purchase Agreement") with Ventures pursuant to which Ventures agreed to
purchase 6,095,238 shares of Common Stock (the "Shares") for an aggregate
purchase price of $15,999,999.75 (the "Purchase"). Pursuant to the Purchase
Agreement, the Company agreed to issue the Shares to Ventures in consideration
of the purchase price and certain rights under the Purchase Agreement and the
Registration Rights Agreement (as defined), as described below. The closing of
the Purchase occurred on April 10, 1997 (the "Closing Date").

    Registration Rights. Pursuant to a Registration Rights Agreement (the
"Registration Rights Agreement"), dated April 10, 1997, between Ventures, the
Company and the former shareholders of Fluid Management, Inc., a Wisconsin
corporation ("FMI"), the







                                      -6-


<PAGE>


Company has agreed to file and cause to be declared effective, as soon as
practicable after the Closing Date, but in any event within nine months after
the Closing Date, a registration statement (the "Shelf Registration Statement")
pursuant to Rule 415 under the Securities Act of 1933, as amended (the
"Securities Act"), relating to the offer and sale of (i) the Shares by Ventures
and (ii) the shares (the "Merger Shares") of Common Stock acquired by the former
shareholders of FMI pursuant to the Merger Agreement (as defined).

    The obligation of the Company to continue the effectiveness of the Shelf
Registration Statement shall terminate when, in the opinion of counsel to the
Company, all of the Shares and the Merger Shares could be sold by the holders
thereof in any 90-day period pursuant to Rule 144 under the Securities Act
(without giving effect to the provisions of Rule 144(k)).

    Transfer of Shares. Pursuant to the terms of the Purchase Agreement,
Ventures has agreed that it will not sell or otherwise transfer any Shares
without the prior written consent of the Company for a period of one year after
the Closing Date.

    Board Representation. Under the Purchase Agreement, for so long as Ventures
owns beneficially (within the meaning of Rule 13d-3 under the Exchange Act) at
least 7.5% of the issued and outstanding shares of the Common Stock, the Company
will nominate and use its best efforts to elect and to cause to remain as a
director on the Company's Board of Directors one individual as





                                      -7-



<PAGE>




Ventures may designate. Any vacancy created by the death, disability, retirement
or removal of any such individual may be filled by Ventures. The initial
designee of Ventures was Robert S. Hillas, who is a general partner of WP and a
member of EMW. Mr. Hillas was elected on April 9, 1997 to the Company's Board of
Directors.

    Merger Agreement. The proceeds of the Purchase were used by the Company
primarily to finance the acquisition of all the voting securities of FMI,
pursuant to a certain Agreement and Plan of Merger, dated January 14, 1997 (the
"Merger Agreement"), among the Company, FMI, and the shareholders of FMI. The
closing of the transactions contemplated by the Merger Agreement occurred
simultaneously with the closing of the Purchase.

    The foregoing descriptions of the Purchase Agreement and the Registration
Rights Agreement are qualified in their entirety by reference to the Purchase
Agreement and the Registration Rights Agreement, which are attached hereto as
Exhibit 1 and Exhibit 2, respectively, and are incorporated herein by reference.

    The purchase was effected because of the Reporting Entities' belief that the
Company represents an attractive investment. As contemplated by the terms of the
Purchase Agreement, Robert S. Hillas, who is a general partner of WP and a
member of EMW, was elected on April 9, 1997 to the Company's Board of Directors.
Mr. Hillas disclaims beneficial ownership (within the meaning of Rule 13d-3
under the Exchange Act) of the Common Stock owned by






                                      -8-



<PAGE>


Ventures. The Reporting Entities presently expect to limit their involvement in
the management of the Company to representation on the Board of Directors.

    The Reporting Entities may from time to time acquire additional shares of
Common Stock or dispose of shares of Common Stock through open market or
privately negotiated transactions or otherwise, depending on existing market
conditions and other considerations discussed below. The Reporting Entities
intend to review their investment in the Company on a continuing basis and,
depending upon the price and availability of shares of Common Stock, subsequent
developments affecting the Company, the Company's business and prospects, other
investment and business opportunities available to the Reporting Entities,
general stock market and economic conditions, tax considerations and other
factors considered relevant, may decide at any time not to increase, or to
decrease, the size of their investment in the Company.

    Except as set forth herein or in Item 6, none of the Reporting Entities nor,
to the best of their knowledge, any person listed in Schedule I hereto, has any
plans or proposals which relate to or would result in: (a) the acquisition by
any person of additional securities of the Company, or the disposition of
securities of the Company; (b) an extraordinary corporate transaction, such as a
merger, reorganization or liquidation, involving the Company or any of its
subsidiaries; (c) a sale or






                                      -9-




<PAGE>


transfer of a material amount of assets of the Company or any of its
subsidiaries; (d) any change in the present Board of Directors or management of
the Company, including any plans or proposals to change the number or term of
directors or to fill any existing vacancies on the board; (e) any material
change in the present capitalization or dividend policy of the Company; (f) any
other material change in the Company's business or corporate structure; (g)
changes in the Company's charter, By-Laws or instruments corresponding thereto
or other actions which may impede the acquisition of control of the Company by
any person; (h) causing a class of securities of the Company to be delisted from
a national securities exchange or to cease to beauthorized to be quoted in an
inter-dealer quotation system of a registered national securities association;
(i) a class of equity securities of the Company becoming eligible for
termination of registration pursuant to Section 12(g)(4) of the Exchange Act; or
(j) any action similar to any of those enumerated above.

Item 5.  Interest in Securities of the Issuer.

         (a) As of April 11, 1997, Ventures beneficially owned 6,095,238 shares
of Common Stock. By reason of their respective relationships with Ventures, each
of the Reporting Entities may be deemed under Rule 13d-3 under the Exchange Act
to own beneficially all of the shares of Common Stock which Ventures
beneficially owns. As of April 11, 1997, the shares of Common Stock held by the
Reporting Entities represented approximately 26.3% of the






                                      -10-




<PAGE>


outstanding shares of Common Stock, based on 23,161,135 shares of Common Stock
reported to be outstanding as disclosed in the Company's report on Form 10-C to
The Nasdaq Stock Market, dated April 10, 1997.

    (b) The Reporting Entities together share the power to vote or to direct the
vote, and to dispose or to direct the disposition of the Shares held by them.

    (c) Except for the Purchase, none of the Reporting Entities nor, to the best
of their knowledge, any person listed in Schedule I hereto, has effected any
transactions in the Common Stock during the preceding 60 days.

    (d) Except as set forth in this Item 5, no person other than each respective
record owner referred to herein of securities is known to have the right to
receive or the power to direct the receipt of dividends from, or the proceeds
from the sale of, such securities.

    (e) Not applicable.

Item 6.  Contracts, Arrangements, Understandings or
         Relationships With Respect to Securities of the Issuer.

    Pursuant to Rule 13d-1(f) promulgated under the Exchange Act, the Reporting
Persons have entered into an agreement with respect to the joint filing of this
statement, and any amendment or amendments hereto, which is being filed as
Exhibit 3 to this Schedule 13D and is incorporated herein by reference.

    As described in Item 4, Ventures and the Company have agreed, pursuant to
the Purchase Agreement and the Registration Rights








                                      -11-





<PAGE>

Agreement, to certain terms with respect to registration and sale of shares of
the Common Stock, as well as to rights of representation on the Company's Board
of Directors. The information set forth in Item 4 above is incorporated herein
by reference.

    Except as described herein and by reference to Item 4 above, there are no
contracts, arrangements, understandings or relationships among the persons named
in Item 2 or between such persons and any other person with respect to any
securities of the Company.

    By virtue of the relationships among the Reporting Entities as described in
Item 2, the Reporting Entities may be deemed to be a "group" under the Federal
securities laws. Lionel I. Pincus disclaims any beneficial ownership of the
Shares reported herein as being beneficially owned by the Reporting Entities.


















                                      -12-



<PAGE>

Item 7.  Material to be Filed as Exhibits.

    1. Securities Purchase Agreement, dated January 14, 1997, by and between the
Company and Ventures.

    2. Registration Rights Agreement, dated as of April 10, 1997, by and among
the Company, Ventures and the former shareholders of FMI.

    3. Joint Filing Agreement, dated April 18, 1997, by and among the Reporting
Entities.





















                                      -13-



<PAGE>




                                   SIGNATURES


    After reasonable inquiry and to the best of our knowledge and belief, the
undersigned certify that the information set forth in this statement is true,
complete and correct.



Dated: April 18, 1997                WARBURG, PINCUS VENTURES, L.P.

                                     By: Warburg, Pincus & Co.,
                                          General Partner



                                     By:/s/ Robert S. Hillas
                                        -------------------------------
                                        Robert S. Hillas
                                        Partner



Dated: April 18, 1997                WARBURG, PINCUS & CO.



                                     By:/s/ Robert S. Hillas
                                        -------------------------------
                                        Robert S. Hillas
                                        Partner



Dated: April 18, 1997                E.M. WARBURG, PINCUS & CO., LLC



                                     By:/s/ Robert S. Hillas
                                        -------------------------------
                                        Robert S. Hillas
                                        Member










                                      -14-





<PAGE>




                                   SCHEDULE I

    Set forth below is the name, position and present principal occupation of
each of the general partners of Warburg, Pincus & Co. ("WP") and each of the
members of E.M. Warburg, Pincus & Co., LLC ("EMW"). The sole general partner of
Warburg, Pincus Ventures, L.P. ("Ventures") is WP. WP, EMW and Ventures are
hereinafter collectively referred to as the "Reporting Entities." Except as
otherwise indicated, the business address of each of such persons is 466
Lexington Avenue, New York, New York 10017, and each of such persons is a
citizen of the United States.


                             General Partners of WP
                             ----------------------

                                               Present Principal Occupation
Name                                           in Addition to Position with WP
- ----                                           -------------------------------

Susan Black                                    Managing Director and Member,
                                               EMW

Christopher W. Brody                           Managing Director and Member,
                                               EMW

Harold Brown                                   Senior Managing Director and
                                               Member, EMW

Errol M. Cook                                  Managing Director and Member,
                                               EMW

W. Bowman Cutler                               Managing Director and Member,
                                               EMW

Elizabeth B. Dater                             Managing Director and Member,
                                               EMW

Stephen Distler                                Managing Director, Member and
                                               Treasurer, EMW

Harold W. Ehrlich                              Managing Director and Member,
                                               EMW

Louis G. Elson                                 Managing Director and Member,
                                               EMW

John L. Furth                                  Vice Chairman of the Board and
                                               Member, EMW





                                      S-1



<PAGE>






Stewart K.P. Gross                             Managing Director and Member,
                                               EMW

Patrick T. Hackett                             Managing Director and Member,
                                               EMW

Jeffrey A. Harris                              Managing Director and Member,
                                               EMW

Robert S. Hillas                               Managing Director and Member,
                                               EMW

A. Michael Hoffman                             Managing Director and Member,
                                               EMW

William H. Janeway                             Managing Director and Member,
                                               EMW

Douglas M. Karp                                Managing Director and Member,
                                               EMW

Charles R. Kaye                                Managing Director and Member,
                                               EMW

Henry Kressel                                  Managing Director and Member,
                                               EMW

Joseph P. Landy                                Managing Director and Member,
                                               EMW

Sidney Lapidus                                 Managing Director and Member,
                                               EMW

Kewsong Lee                                    Managing Director and Member,
                                               EMW

Reuben S. Leibowitz                            Managing Director and Member,
                                               EMW

Brady T. Lipp                                  Managing Director and Member,
                                               EMW







                                      S-2



<PAGE>






Stephen J. Lurito                              Managing Director and Member,
                                               EMW

Spencer S. Marsh III                           Managing Director and Member,
                                               EMW

Lynn C. Martin                                 Managing Director and Member,
                                               EMW

Edward J. McKinley                             Managing Director and Member,
                                               EMW

Rodman W. Moorhead III                         Senior Managing Director and
                                               Member, EMW

Howard H. Newman                               Managing Director and Member,
                                               EMW

Gary D. Nusbaum                                Managing Director and Member,
                                               EMW

Anthony G. Orphanos                            Managing Director and Member,
                                               EMW

Dalip Pathak                                   Managing Director and Member,
                                               EMW

Daphne D. Philpson                             Managing Director and Member,
                                               EMW

Lionel I. Pincus                               Chairman of the Board, CEO, and
                                               Managing Member, EMW; and
                                               Managing Partner, Pincus & Co.

Eugene L. Podsiadlo                            Managing Director and Member,
                                               EMW

Ernest H. Pomerantz                            Managing Director and Member,
                                               EMW

Brian S. Posner                                Managing Director and Member,
                                               EMW

Arnold M. Reichman                             Managing Director and Member,
                                               EMW

Roger Reinlieb                                 Managing Director and Member,
                                               EMW










                                      S-3



<PAGE>





John D. Santoleri                              Managing Director and Member,
                                               EMW

Sheila N. Scott                                Managing Director and Member,
                                               EMW

Peter Stalker III                              Managing Director and Member,
                                               EMW

David A. Tanner                                Managing Director and Member,
                                               EMW

James E. Thomas                                Managing Director and Member,
                                               EMW

John L. Vogelstein                             Vice Chairman of the Board and
                                               Member, EMW

Elizabeth H. Weatherman                        Managing Director and Member,
                                               EMW

Joanne R. Wenig                                Managing Director and Member,
                                               EMW

George U. Wyper                                Managing Director and Member,
                                               EMW

Pincus & Co.*

NL & Co.**

* Pincus & Co. is a New York limited partnership whose primary activity is
ownership interest in WP and EMW.

** NL & Co. is a New York limited partnership whose primary activity is
ownership interest in WP.










                                      S-4


<PAGE>




                                 Members of EMW
                                 --------------

                                               Present Principal Occupation in
Name                                           Addition to Position with EMW
- ----                                           -------------------------------

Susan Black                                    Partner, WP

Christopher W. Brody                           Partner, WP

Harold Brown                                   Partner, WP

Dale C. Christensen (1)

Errol M. Cook                                  Partner, WP

W. Bowman Cutter                               Partner, WP

Elizabeth B. Dater                             Partner, WP

Stephen Distler                                 Partner, WP

P. Nicholas Edwards(2)

Harold W. Ehrlich                              Partner, WP

Louis G. Elson                                 Partner, WP

John L. Furth                                  Partner, WP

Stewart K.P. Gross                             Partner, WP

Patrick T. Hackett                             Partner, WP

Jeffrey A. Harris                              Partner, WP

Robert S. Hillas                               Partner, WP

A. Michael Hoffman                             Partner, WP

William H. Janeway                             Partner, WP

Douglas M. Karp                                Partner, WP



____________________________

(1)  Citizen of Canada

(2)  Citizen of United Kingdom








                                      S-5



<PAGE>




Charles R. Kaye                                Partner, WP

Richard H. King (2)

Henry Kressel                                  Partner, WP

Joseph P. Landy                                Partner, WP

Sidney Lapidus                                 Partner, WP

Kewsong Lee                                    Partner, WP

Reuben S. Leibowitz                            Partner, WP

Brady T. Lipp                                  Partner, WP

Stephen J. Lurito                              Partner, WP

Spencer S. Marsh III                           Partner, WP

Lynn C. Martin                                 Partner, WP

Edward J. McKinley                             Partner, WP

Rodman W. Moorhead III                         Partner, WP

Howard H. Newman                               Partner, WP

Gary D. Nusbaum                                Partner, WP

Anthony G. Orphanos                            Partner, WP

Dalip Pathak                                   Partner, WP

Philip C. Percival (2)

Daphne D. Philipson                            Partner, WP

Lionel I. Pincus                               Managing Partner, WP; and
                                               Managing Partner, Pincus & Co.

Eugene L. Podsiadlo                            Partner, WP

Ernest H. Pomerantz                            Partner, WP

Brian S. Posner                                Partner, WP

Arnold M. Reichman                             Partner, WP











                                      S-6




<PAGE>



Roger Reinlieb                                 Partner, WP

John D. Santoleri                              Partner, WP

Sheila N. Scott                                Partner, WP

Dominic H. Shorthouse (2)

Peter Stalker III                              Partner, WP

Chang Q. Sun (3)

David A. Tanner                                Partner, WP

James E. Thomas                                Partner, WP

John L. Vogelstein                             Partner, WP

Elizabeth H. Weathermen                        Partner, WP

Joanne R. Wenig                                Partner, WP

George U. Wyper                                Partner, WP

Pincus & Co.*

* Pincus & Co. is a New York limited partnership whose primary activity is
ownership interest in WP and EMW.

















___________________________

(3)  Citizen of People's Republic of China










                                      S-7



<PAGE>



- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------



                          SECURITIES PURCHASE AGREEMENT


                                     between


                         WARBURG, PINCUS VENTURES, L.P.


                                       and


                                 ENVIROGEN, INC.





                                January 14, 1997





- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------



<PAGE>



                                TABLE OF CONTENTS

                                                                           PAGE

SECTION 1.  PURCHASE AND SALE OF SECURITIES....................................2
         1.1.  Issuance of Common Stock........................................2

SECTION 2.  REPRESENTATIONS AND WARRANTIES OF THE COMPANY......................2
         2.1.  Corporate Organization..........................................2
         2.2.  Subsidiaries....................................................3
         2.3.  Capitalization..................................................3
         2.4.  Corporate Proceedings, etc......................................4
         2.5.  Consents and Approvals..........................................4
         2.6.  Absence of Defaults, Conflicts, etc.............................4
         2.7.  SEC Reports.....................................................4
         2.8.  Absence of Certain Developments.................................6
         2.9.  Compliance with Law.............................................6
         2.10.  Litigation.....................................................7
         2.11.  Material Contracts.............................................7
         2.12.  Absence of Undisclosed Liabilities.............................7
         2.13.  Employees......................................................8
         2.14.  Tax Matters....................................................8
         2.15.  Employee Benefit Plans.........................................8
         2.16.  Patents, Licenses, etc.........................................9
         2.17.  Title to Tangible Assets......................................10
         2.18.  Condition of Properties.......................................10
         2.19.  Insurance.....................................................10
         2.20.  Transactions with Related Parties.............................10
         2.21.  Interest in Competitors.......................................11
         2.22.  Registration Rights...........................................11
         2.23.  Private Offering..............................................11
         2.24.  Environmental.................................................11
         2.25.  Fluid Management Agreement Representations....................12
         2.26.  Brokerage.....................................................13
         2.27.  Illegal or Unauthorized Payments; Political
                Contributions.................................................14
         2.28.  Takeover Statute..............................................14
         2.29.  Material Facts................................................14

SECTION 3.  REPRESENTATIONS AND WARRANTIES OF WARBURG.........................14

SECTION 4.  ADDITIONAL COVENANTS OF THE PARTIES...............................16
         4.1.  Resale of Securities...........................................16
         4.2.  Covenants Pending Closing......................................17
         4.3.  Further Assurance..............................................17
         4.4.  Board Nominee..................................................17
         4.5.  Hart-Scott-Rodino..............................................17

SECTION 5.  WARBURG'S CLOSING CONDITIONS......................................18
         5.1.  Representations and Warranties.................................18


                                       i
<PAGE>

         5.2.  Compliance with Agreement......................................18
         5.3.  Officer's Certificate..........................................18
         5.4.  Injunction.....................................................19
         5.5.  Counsel's Opinion..............................................19
         5.6.  Acquisition of Fluid Management................................19
         5.7.  Consents; Hart-Scott-Rodino....................................20
         5.8.  Election of Directors..........................................19
         5.9.  Registration Rights Agreement..................................19
         5.10.  Approval of Proceedings.......................................19

SECTION 6.  COMPANY CLOSING CONDITIONS........................................20
         6.1.  Representations and Warranties.................................20
         6.2.  Compliance with Agreement......................................20
         6.3.  Warburg's Certificate..........................................20
         6.4.  Consents; Hart-Scott-Rodino....................................20
         6.5.  Injunction.....................................................20
         6.6.  Acquisition of Fluid Management................................19

SECTION 7.  RESERVED..........................................................21

SECTION 8.  COVENANTS.........................................................21
         8.1.  Confidentiality................................................21
         8.2.  Lost, etc. Certificates Evidencing Shares of
               Common Stock; Exchange.........................................21

SECTION 9.  INTERPRETATION OF THIS AGREEMENT..................................22
         9.1.  Terms Defined..................................................22
         9.2.  Accounting Principles..........................................23
         9.3.  Directly or Indirectly.........................................23
         9.4.  Governing Law..................................................23
         9.5.  Paragraph and Section Headings.................................24

SECTION 10.  MISCELLANEOUS....................................................24
         10.1.  Notices.......................................................24
         10.2.  Expenses and Taxes............................................24
         10.3.  Reproduction of Documents.....................................25
         10.4.  Termination and Survival......................................25
         10.5.  Successors and Assigns........................................26
         10.6.  Entire Agreement; Amendment and Waiver........................26
         10.7.  Severability..................................................26
         10.8.  Limitation on Enforcement of Remedies.........................26
         10.9.  Counterparts..................................................26

EXHIBIT A                  Certificate of Incorporation of the Company
EXHIBIT B                  Bylaws of the Company
EXHIBIT C                  Form of Opinion of Company Counsel


                                       ii
<PAGE>



                                 ENVIROGEN, INC.

                          SECURITIES PURCHASE AGREEMENT

                          Dated as of January 14, 1997

Warburg, Pincus Ventures, L.P.
466 Lexington Avenue
New York, New York  10017

Dear Sirs:

                  Envirogen,  Inc.,  a  Delaware  corporation  (the  "Company"),
hereby  agrees  with  Warburg,   Pincus  Ventures,   L.P.,  a  Delaware  limited
partnership ("Warburg"), as follows:

SECTION 1.  PURCHASE AND SALE OF SECURITIES
            -------------------------------

            1.1. Issuance of Common Stock
                 ------------------------

            (a) Subject to the terms and  conditions set forth in this Agreement
and in reliance  upon the  Company's  and  Warburg's  representations  set forth
below, on the Closing Date (as defined below) the Company shall sell to Warburg,
and Warburg shall purchase from the Company,  6,095,238 shares (the "Shares") of
the Company's Common Stock,  par value $.01 per share (the "Common  Stock"),  at
the aggregate cash purchase price of $15,999,999.75 (the "Purchase Price"). Such
sale and purchase shall be effected on the Closing Date by the Company executing
and  delivering to Warburg,  duly  registered in its name, a duly executed stock
certificate  evidencing the Shares being  purchased by it,  against  delivery by
Warburg to the Company of the  Purchase  Price by wire  transfer of  immediately
available funds to such account as the Company shall designate.

            (b) The closing of such sale and purchase (the "Closing") shall take
place contemporaneously with the merger of Fluid Management,  Inc. with and into
the Company  pursuant to the Fluid Management  Agreement,  or such other date as
Warburg and the Company agree in writing (the "Closing Date"), at the offices of
Willkie Farr &  Gallagher,  153 East 53rd Street,  New York,  New York,  or such
other location as Warburg and the Company shall mutually select.




                                       1
<PAGE>



SECTION 2.  REPRESENTATIONS AND WARRANTIES OF THE COMPANY
            ---------------------------------------------

            The Company represents and warrants to Warburg that:

            2.1. Corporate Organization
                 ----------------------

            (a) The Company is a corporation  duly organized,  validly  existing
and in good standing under the laws of the State of Delaware. Attached hereto as
Exhibits A and B, respectively,  are true and complete copies of the Certificate
of  Incorporation  and Bylaws of the Company,  each as amended  through the date
hereof (collectively, the "Organizational Documents").

            (b) The Company has all  requisite  power and  authority and has all
necessary approvals,  licenses,  permits and authorization to own its properties
and to carry on its  business as now  conducted.  The Company has all  requisite
power and  authority  to execute and deliver this  Agreement  and to perform its
obligations hereunder.

            (c) The Company has filed all  necessary  documents to qualify to do
business as a foreign  corporation in, and the Company is in good standing under
the laws of, each jurisdiction in which the conduct of the Company's business or
the nature of the property owned requires such  qualification,  except where the
failure to so qualify would not have a material  adverse affect on the business,
properties,  prospects,  profits or condition  (financial  or  otherwise) of the
Company and its subsidiaries taken as a whole (a "Material Adverse Effect").

            2.2. Subsidiaries
                 ------------

            Except as set forth on Schedule 2.2, the Company has no subsidiaries
and no interests or  investments  in any  partnership,  trust or other entity or
organization.  Each  subsidiary  of the Company  listed on Schedule 2.2 has been
duly  incorporated,  is validly existing as a corporation in good standing under
the laws of the jurisdiction of its  incorporation,  has the corporate power and
authority  to own  its  properties  and to  conduct  its  business  and is  duly
registered,  qualified  and  authorized  to  transact  business  and is in  good
standing in each jurisdiction in which the conduct of its business or the nature
of its properties  requires such  registration,  qualification or authorization,
except where the failure to so register, qualify or be authorized would not have
a Material  Adverse Effect;  all of the issued and outstanding  capital stock of
each subsidiary has been duly  authorized and validly issued,  is fully paid and
non-assessable,  and is owned by the  Company  free and  clear of any  mortgage,
pledge, lien, encumbrance, security interest, claim or equity.



                                       2
<PAGE>



            2.3. Capitalization
                 --------------

            (a) On the date hereof,  the authorized capital stock of the Company
consists of 20,000,000  shares of its Common Stock and  2,000,000  shares of its
preferred  stock,  par value $.01 per share (the "Preferred  Stock").  As of the
Closing  Date,  the  authorized  capital  stock of the Company  will  consist of
50,000,000  shares of its Common  Stock and  2,000,000  shares of its  Preferred
Stock. The issued and outstanding  shares of capital stock of the Company on the
date hereof consist of 12,872,440 shares of Common Stock.

            (b) All the outstanding  shares of capital stock of the Company have
been duly and  validly  issued and are fully paid and  non-assessable,  and were
issued in accordance with the registration or qualification  requirements of the
Securities  Act and any  relevant  state  securities  laws or  pursuant to valid
exemptions therefrom.  Upon issuance,  sale and delivery as contemplated by this
Agreement,  the Shares will be duly authorized,  validly issued,  fully paid and
non-assessable  shares of the Company, free of all preemptive or similar rights,
and entitled to the rights therein described.

            (c) Except for the  conversion  rights which attach to the warrants,
options and convertible  securities which are listed on Schedule 2.3 hereto,  on
the Closing Date there will be no shares of Common Stock, Preferred Stock or any
other equity security of the Company issuable upon conversion or exchange of any
security  of the  Company  nor will there be any  rights,  options  or  warrants
outstanding  or other  agreements to acquire shares of Common Stock or Preferred
Stock nor will the Company be  contractually  obligated to  purchase,  redeem or
otherwise  acquire any of its  outstanding  shares.  Schedule 2.3 sets forth the
exercise price, vesting provisions,  expiration date and other material terms of
all warrants,  options and convertible securities listed therein. No stockholder
of the Company is entitled to any  preemptive or similar rights to subscribe for
shares of capital stock of the Company.

            2.4. Corporate Proceedings, etc.
                 --------------------------

            The Board of Directors of the Company has  authorized the execution,
delivery,  and  performance of this Agreement and each of the  transactions  and
agreements   contemplated   hereby.   No  other  corporate  action  (other  than
stockholder  approval) is necessary to authorize  such  execution,  delivery and
performance  of this  Agreement,  and this Agreement  constitutes  the valid and
binding obligation of the Company, enforceable against the Company in accordance
with its terms,  except  that such  enforcement  may be  subject to  bankruptcy,



                                       3
<PAGE>



insolvency, reorganization, moratorium or other similar laws now or hereafter in
effect relating to creditors' rights and general principles of equity. The Board
of  Directors  of the Company has  authorized  the  issuance and delivery of the
Shares in accordance with this Agreement.

            2.5. Consents and Approvals
                 ----------------------

            The  execution  and delivery by the Company of this  Agreement,  the
performance by the Company of its obligations  hereunder and the consummation by
the Company of the transactions  contemplated  hereby do not require the Company
or any of its subsidiaries to obtain any consent, approval or action of, or make
any filing  with or give any notice to, any  corporation,  person or firm or any
public, governmental or judicial authority, except such approvals,  consents, or
filings that have been made or obtained or as disclosed on Schedule 2.5.

            2.6. Absence of Defaults, Conflicts, etc.
                 -----------------------------------

            The  execution  and  delivery  of this  Agreement  do  not,  and the
fulfillment  of the terms hereof by the Company,  and the issuance of the Shares
will not,  result in a breach of any of the terms,  conditions or provisions of,
or constitute a default  under,  or permit the  acceleration  of rights under or
termination  of,  any  material  indenture,  mortgage,  deed  of  trust,  credit
agreement,  note or other evidence of indebtedness,  or other material agreement
of the Company or any of its subsidiaries  (collectively the "Key Agreements and
Instruments"), or the Organizational Documents, or any rule or regulation of any
court or federal,  state or foreign  regulatory board or body or  administrative
agency having  jurisdiction  over the Company or any of its subsidiaries or over
their  respective  properties  or  businesses.  No  event  has  occurred  and no
condition  exists  which,  upon notice or the  passage of time (or both),  would
constitute a default under any such Key  Agreements  and  Instruments  or in any
license,  permit or  authorization  to which the Company or any  subsidiary is a
party or by which any of them may be bound.

            2.7. SEC Reports
                 -----------

            The Company has previously  furnished Warburg with true and complete
copies of its (i) Annual  Report on Form 10-K,  as amended,  for the fiscal year
ended December 31, 1995, as filed with the SEC, (ii)  Quarterly  Reports on Form
10-Q for the quarters  ended March 31,  1996,  June 30, 1996 and  September  30,
1996, as filed with the SEC, (iii) proxy  statements  related to all meetings of
its stockholders  (whether annual or special) since January 1, 1996 and (iv) all
other reports or registration statements filed by the Company with the SEC since
January 1,



                                       4
<PAGE>



1996,  except  registration  statements on Form S-8 relating to employee benefit
plans,  which are all the documents (other than  preliminary  material) that the
Company  was  required  to file  with the SEC since  that  date  (the  documents
described in clauses (i) through (iv) being referred to herein  collectively  as
the "SEC Reports").  As of their  respective  dates, the SEC Reports complied in
all  material  respects  with  the  requirements  of the  Securities  Act or the
Exchange  Act,  as the case may be,  and the  rules and  regulations  of the SEC
thereunder applicable to such SEC Reports. As of their respective dates, the SEC
Reports did not contain any untrue statement of a material fact or omit to state
a  material  fact  required  to be  stated  therein  or  necessary  to make  the
statements  therein,  in light of the circumstances  under which they were made,
not  misleading.  The audited  consolidated  financial  statements and unaudited
interim  financial  statements of the Company included in the SEC Reports comply
as to form in all material respects with applicable accounting  requirements and
with the published  rules and regulations of the SEC with respect  thereto.  The
financial  statements  included  in the  SEC  Reports:  have  been  prepared  in
accordance with generally accepted  accounting  principles ("GAAP") applied on a
consistent  basis (except as may be indicated  therein or in the notes thereto);
present fairly, in all material respects, the consolidated financial position of
the Company and its  subsidiaries  as at the dates thereof and the  consolidated
results of their operations and cash flow for the periods then ended subject, in
the case of the unaudited interim financial statements, to normal year-end audit
adjustments  and any  other  adjustments  described  therein  and the fact  that
certain  information and notes have been condensed or omitted in accordance with
the Exchange Act and the rules promulgated  thereunder;  and are in all material
respects, in accordance with the books of account and records of the Company.

            2.8. Absence of Certain Developments
                 -------------------------------

            Except as  disclosed  in the SEC Reports or on Schedule  2.8,  since
December  31,  1995,  there  has  been no (i)  material  adverse  change  in the
condition,  financial or otherwise, of the Company and its subsidiaries taken as
a whole or in their assets,  liabilities,  properties, or business or prospects,
(ii) declaration, setting aside or payment of any dividend or other distribution
with  respect to the capital  stock of the  Company,  (iii)  issuance of capital
stock (other than pursuant to the exercise of options,  warrants, or convertible
securities  outstanding at such date) or options,  warrants or rights to acquire
capital  stock  (other  than the  rights  granted to  Warburg  hereunder),  (iv)
material  loss,  destruction  or damage to any  property  of the  Company or any
subsidiary,  whether or not  insured,  (v)  acceleration  or  prepayment  of any
indebtedness for



                                       5
<PAGE>



borrowed  money or the refunding of any such  indebtedness,  (vi) material labor
trouble  involving the Company or any subsidiary or any material change in their
personnel  or the  terms  and  conditions  of  employment,  (vii)  waiver of any
valuable right, (viii) loan or extension of credit to any officer or employee of
the Company or any subsidiary or (ix) acquisition or disposition of any material
assets  (or  any  contract  or  arrangement  therefor),  or any  other  material
transaction  by the Company or any  subsidiary  otherwise than for fair value in
the ordinary course of business.

            2.9. Compliance with Law
                 -------------------

            (a) Neither the Company nor any of its  subsidiaries  is in material
violation of any laws, ordinances, governmental rules or regulations to which it
is subject,  including  without  limitation laws or regulations  relating to the
environment or to occupational  health and safety, and no material  expenditures
are or will be required in order to cause its current  operations  or properties
to comply with any such laws, ordinances, governmental rules or regulations.

            (b) The Company and its  subsidiaries  have all  licenses,  permits,
franchises or other  governmental  authorizations  necessary to the ownership of
their  property  or to the  conduct  of their  respective  businesses,  which if
violated or not obtained is reasonably likely to have a Material Adverse Effect.
Neither the Company nor any subsidiary  has finally been denied any  application
for any such licenses,  permits, franchises or other governmental authorizations
necessary to its business.

            2.10. Litigation
`                 ----------

            Except as disclosed in the SEC Reports or on Schedule 2.10, there is
no legal  action,  suit,  arbitration  or other legal,  administrative  or other
governmental investigation, inquiry or proceeding, whether federal, state, local
or foreign  (collectively "Legal  Proceedings"),  pending or, to the best of the
Company's  knowledge,  threatened  against  or  affecting  the  Company  or  any
subsidiary or any of their respective properties,  assets or businesses,  nor is
there  any  Legal  Proceeding  pending  or,  to the  knowledge  of the  Company,
threatened,  relating to this Agreement or the transactions contemplated hereby.
After reasonable  inquiry of its officers,  the Company is not aware of any fact
which  might  result in or form the basis for any Legal  Proceeding  which could
have a Material  Adverse  Effect.  Neither  the Company  nor any  subsidiary  is
subject to any order, writ, judgment, injunction, decree, determination or award
of any court or of any governmental agency or instrumentality  (whether federal,
state, local or foreign).



                                       6
<PAGE>



            2.11. Material Contract
                  -----------------

            Except as  disclosed in the SEC Reports or on Schedule  2.11,  there
are no  material  contracts,  agreements,  instruments,  commitments  and  other
arrangements  to which the  Company or any  subsidiary  is a party or  otherwise
relating to or  affecting  any of their  respective  assets,  including  without
limitation,  employment,  severance or consulting  agreements;  loan,  credit or
security agreements; joint venture agreements and distribution agreements (each,
a "Contract").  Each such Contract is valid, binding and enforceable against the
Company or such  subsidiary  and, to the  Company's  best  knowledge,  the other
parties thereto,  in accordance with its terms, except that such enforcement may
be  subject  to  bankruptcy,  insolvency,  reorganization,  moratorium  or other
similar  laws now or  hereafter  in effect  relating  to  creditors'  rights and
general principles of equity.  Each such Contract is in full force and effect on
the date hereof.

            2.12. Absence of Undisclosed Liabilities
                  ----------------------------------

            Except as disclosed in the SEC Reports or on Schedule 2.12,  neither
the Company nor any of its  subsidiaries  has any debt,  obligation or liability
(whether accrued, absolute, contingent,  liquidated or otherwise, whether due or
to  become  due,  whether  or not  known  to  the  Company)  arising  out of any
transaction  entered into at or prior to the Closing,  or any act or omission at
or prior to the  Closing,  or any  state  of facts  existing  at or prior to the
Closing,  including  taxes with  respect to or based  upon the  transactions  or
events occurring at or prior to the Closing, and including,  without limitation,
unfunded past service  liabilities under any pension,  profit sharing or similar
plan,  except current  liabilities  incurred,  and obligations  under agreements
entered  into,  in the usual and  ordinary  course  of  business,  none of which
(individually or in the aggregate) could have a Material Adverse Effect.

            2.13. Employees
                  ---------

            (a) The  Company and its  subsidiaries  are in  compliance  with all
applicable  foreign,  federal,  state and local laws and  regulations  regarding
occupational safety and health standards except to the extent that noncompliance
will not have a Material Adverse Effect, and has received no complaints from any
foreign,  federal,  state or local agency or regulatory body alleging violations
of any such laws and regulations.

            (b) The Company is not aware that any of its  employees is obligated
under any contract (including licenses,  covenants or commitments of any nature)
or other agreement, or subject to any



                                       7
<PAGE>



judgment,  decree or order of any court or  administrative  agency,  that  would
interfere with the use of such  employee's best efforts to promote the interests
of the Company or that would conflict with the Company's business as proposed to
be conducted.

            (c) The  Company is not aware that any officer or key  employee,  or
that any group of key employees,  intends to terminate their employment with the
Company,  nor does  the  Company  have a  present  intention  to  terminate  the
employment of any of the foregoing.

            2.14. Tax Matters
                  -----------

            There are no federal,  state,  county or local taxes due and payable
by the  Company  or any of its  subsidiaries  which  have  not  been  paid.  The
provisions for taxes on the audited and unaudited  balance  sheets  contained in
the SEC  Reports  are  sufficient  for the  payment  of all  accrued  and unpaid
federal, state, county and local taxes of the Company whether or not assessed or
disputed as of the respective dates of such balance sheets.  The Company and its
subsidiaries  have duly filed all federal,  state,  county and local tax returns
required  to have  been  filed by it and  there  are in  effect  no  waivers  of
applicable  statutes of limitations with respect to taxes for any year.  Neither
the Company nor any of its  subsidiaries  has been subject to a federal or state
tax audit of any kind.

            2.15. Employee Benefit Plans
                  ----------------------

            Except  as  disclosed  on  Schedule   2.15,   the  Company  and  its
subsidiaries  have no employee  benefit plans (as defined in Section 3(3) of the
Employee  Retirement  Income  Security Act of 1974) covering  former and current
employees of the Company or any of its subsidiaries,  or under which the Company
or any of its  subsidiaries  has any obligation or liability.  True and complete
copies of all material plans, contracts, bonuses,  commissions,  profit-sharing,
savings,  stock  options,  insurance,  deferred  compensation,  or other similar
fringe or employee  benefits covering former or current employees of the Company
or any of its subsidiaries or under which the Company or any of its subsidiaries
has any  obligation  or  liability  (each,  a "Benefit  Arrangement")  have been
provided or made  available  to Warburg  prior to the date  hereof.  The Benefit
Arrangements  are and have  been  administered  in  compliance  in all  material
respects with their terms and with the requirements of applicable law. Except as
disclosed on Schedule 2.15,  all payments to current or former  employees of the
Company or any of its subsidiaries  pursuant to the Benefit Arrangements are and
have been fully deductible under the Code.



                                       8
<PAGE>



            2.16. Patents, Licenses, etc.
                  ----------------------

            Except as  provided  on  Schedule  2.16,  the  Company or one of its
subsidiaries  owns,  free and clear of all  encumbrances,  restrictions,  liens,
security  interests and charges,  and has good and marketable title to, or holds
adequate  licenses or otherwise  possess all such rights as are necessary to use
all patents (and applications therefor), patent disclosures, trademarks, service
marks,  trade  names,  copyrights  (and  applications   therefor),   inventions,
discoveries,   processes,  know-how,  scientific,   technical,  engineering  and
marketing  data,  formulae  and  techniques  used or proposed to be used,  in or
necessary  for the conduct of its business as now conducted or as proposed to be
conducted (collectively, "Intellectual Property").

            Except as provided on Schedule 2.16,  neither the Company nor any of
its  subsidiaries  has received  notice nor  otherwise has reason to know of any
conflict  or  alleged  conflict  with the  rights  of others  pertaining  to the
Intellectual  Property  described in this Section 2.16.  To the  Company's  best
knowledge,  the Company's business, as presently conducted and as proposed to be
conducted,  does not infringe upon or violate any patent rights or trade secrets
of others.  To the Company's best  knowledge,  the Company and its  subsidiaries
have the  unrestricted  right to use,  free and clear of any rights or claims of
others, all trade secrets,  processes,  customer lists and other rights incident
to their respective  businesses as now conducted or as proposed to be conducted.
Except as disclosed in the SEC Reports or on Schedule 2.16,  neither the Company
nor any of its  subsidiaries  is  currently  obligated  or  under  any  existing
liability  to make  royalty or other  payments to any owner of,  licensor of, or
other  claimant  to,  any  patent,   trademark,   service  names,  trade  names,
copyrights,  or other  intangible  asset,  with respect to the use thereof or in
connection  with the conduct of its business as now  conducted or as proposed to
be conducted,  or otherwise. To the Company's best knowledge, no employee of the
Company or any of its  subsidiaries  has  violated any  employment  agreement or
proprietary  information  agreement which he had with a previous employer or any
patent policy of such employer, or is a party to or threatened by any litigation
concerning any patents,  trademarks,  trade secrets, service names, trade names,
copyrights, licenses and the like.

            2.17. Title to Tangible Assets
                  ------------------------

            Except  as  disclosed  in the  SEC  Reports,  the  Company  and  its
subsidiaries  have good title to their  properties  and assets and good title to
all their leasehold estates, in each case



                                       9

<PAGE>


subject to no mortgage,  pledge, lien, lease,  encumbrance or charge, other than
or resulting from taxes which have not yet become delinquent and minor liens and
encumbrances  which do not in any case materially  detract from the value of the
property subject thereto or materially  impair the operations of the Company and
its subsidiaries and which have not arisen otherwise than in the ordinary course
of business.

            2.18. Condition of Properties
                  -----------------------

            All facilities,  machinery,  equipment, fixtures, vehicles and other
properties owned, leased or used by the Company and its subsidiaries are in good
operating  condition and repair,  are reasonably fit and usable for the purposes
for which they are being used,  are adequate and sufficient for the Company's or
such  subsidiary's  business  and  comply  in all  material  respects  with  all
applicable ordinances, regulations and laws.

            2.19. Insurance
                  ---------

            The Company and its subsidiaries and their respective properties are
insured in such  amounts,  against  such  losses and with such  insurers  as are
prudent when  considered in light of the nature of the properties and businesses
of the  Company  and its  subsidiaries.  Schedule  2.19  sets  forth a true  and
complete  listing of the insurance  policies of the Company and its subsidiaries
as in effect on the date hereof,  including in each case the applicable coverage
limits,   deductibles  and  the  policy  expiration  dates.  No  notice  of  any
termination or threatened  termination of any of such policies has been received
and such policies are in full force and effect.

            2.20. Transactions with Related Parties
                  ---------------------------------

            Except as disclosed in the SEC Reports or on Schedule 2.20,  neither
the  Company  nor any  subsidiary  is a party to any  agreement  with any of the
Company's directors,  officers or stockholders or any Affiliate or family member
of any of the foregoing under which it: (i) leases any real or personal property
(either to or from such  Person),  (ii) licenses  technology  (either to or from
such Person),  (iii) is obligated to purchase any tangible or  intangible  asset
from or sell such asset to such Person, (iv) purchases products or services from
such Person or (v) has borrowed money from or lent money to such Person.  Except
as set forth in Schedule 2.20, neither the Company nor any subsidiary employs as
an employee or engages as a consultant any family member of any of the Company's
directors, officers or stockholders. To the best knowledge of the Company, there
exist no  agreements  among  stockholders  of the Company to




                                       10
<PAGE>




act in concert with respect to their voting or holding of Company securities.

            2.21. Interest in Competitors
                  -----------------------

            Neither the Company nor any of its  officers  or, to the best of its
knowledge, any of its directors, has any interest,  either by way of contract or
by  way  of  investment  (other  than  as  holder  of not  more  than  2% of the
outstanding capital stock of a publicly traded Person) or otherwise, directly or
indirectly,  in any Person other than the Company that (i) provides any services
or designs,  produces  or sells any  product or product  lines or engages in any
activity  similar to or competitive with any activity  currently  proposed to be
conducted  by the Company or any of its  subsidiaries  or (ii) has any direct or
indirect  interest  in any asset or  property,  real or  personal,  tangible  or
intangible, of the Company.

            2.22. Registration Rights
                  -------------------

            Except as  disclosed  in the SEC  Reports or on  Schedule  2.22,  or
pursuant to the Registration  Rights Agreement,  the Company will not, as of the
Closing Date, be under any  obligation to register any of its  securities  under
the Securities Act of 1933, as amended (the "Securities Act").

            2.23. Private Offering
                  ----------------

            Neither the Company nor anyone  acting on its behalf has sold or has
offered  any of the  Shares  for sale to, or  solicited  offers to buy from,  or
otherwise  approached or negotiated  with respect  thereto with, any prospective
purchaser,  other than  Warburg.  Neither the  Company nor anyone  acting on its
behalf  shall  offer the Shares  for issue or sale to, or  solicit  any offer to
acquire  any of the same from,  anyone so as to bring the  issuance  and sale of
such Shares within the provisions of Section 5 of the Securities Act. Based upon
the  representations of Warburg set forth in Section 3, the offer,  issuance and
sale of the Shares are exempt  from the  registration  and  prospectus  delivery
requirements  of the Securities  Act, and have been  registered or qualified (or
are exempt from registration and qualification)  under the registration,  permit
or qualification requirements of all applicable state securities laws.

            2.24. Environmental
                  -------------

            Except as disclosed in the SEC Reports or on Schedule 2.24,



                                       11
<PAGE>



            (a) except for such noncompliance  which would not,  individually or
in the aggregate,  result in losses,  costs, or liability in excess of $100,000,
the Company and its  operations  are in  compliance  with all  applicable  laws,
regulations and other requirements of governmental or regulatory  authorities or
duties under the common law relating to toxic or hazardous  substances,  wastes,
pollution  or  to  the   protection  of  health,   safety  or  the   environment
(collectively,   "Environmental   Laws")  and  have  obtained  or  filed  timely
applications  for and  maintained  in effect  all  licenses,  permits  and other
authorizations or registrations (collectively  "Environmental Permits") required
under all Environmental  Laws and are in compliance with all such  Environmental
Permits.

            (b) the Company has not  performed  or suffered  any act which could
give rise to, or has otherwise incurred,  liability to any person  (governmental
or  not)  under  the  Comprehensive  Environmental  Response,  Compensation  and
Liability  Act,  42  U.S.C.  (beta)  9601  et  seq.  ("CERCLA"),  or  any  other
Environmental Laws, nor has the Company received notice of any such liability or
any claim therefor or submitted  notice pursuant to Section 103 of CERCLA to any
governmental agency with respect to any of its assets.

            (c) during the period of the  Company's  ownership or lease,  and to
the best of the Company's knowledge prior to that time, no hazardous  substance,
hazardous  waste,  contaminant,  pollutant or toxic substance (as such terms are
defined in any applicable  Environmental Law and collectively referred to herein
as "Hazardous Materials") has been released, placed, dumped or otherwise come to
be located on, at, or beneath any of the assets or properties owned or leased by
the Company or any surface waters or groundwaters thereon or thereunder.

            (d) the  Company  does not own or  operate,  and has never  owned or
operated,  aboveground  or  underground  storage  tanks or surface  improvements
containing Hazardous Materials.

            (e) with respect to any or all of the real properties  leased by the
Company:  (i)  there are no  asbestos-containing  materials,  urea  formaldehyde
insulation,  polychlorinated  biphenyls or lead-based paints present at any such
properties;  and (ii) there are no wetlands as defined  under any  Environmental
Law located on any such properties.

            (f) during the period of the  Company's  ownership or lease,  and to
the  best of the  Company's  knowledge  prior  to that  time,  none of the  real
properties  leased  by the  Company:  (i) has  been  used or is now used for the
generation,  transportation,  storage,  handling,  treatment  or disposal of any
Hazardous



                                       12
<PAGE>



Materials  except  in the  ordinary  course  of the  Company's  business  and in
compliance with  Environmental  Laws, except for noncompliance  which would not,
individually  or in the  aggregate,  result in losses,  costs,  or  liability in
excess of $100,000;  or (ii) is identified on a federal,  state or local listing
of sites which require or might require environmental investigation, mitigation,
remediation or corrective action.

            (g) no condition exists on any of the real properties  leased by the
Company  or,  to the  best of the  Company's  knowledge,  existed  prior  to the
Company's  lease of such property,  that upon the failure to act, the passage of
time or the giving of notice would give rise to liability or the imposition of a
lien under any Environmental Law.

            (h) there are no ongoing investigations or negotiations, pending or,
to the best of the Company's knowledge,  threatened administrative,  judicial or
regulatory  proceedings,  or consent decrees or other  agreements in effect that
relate to environmental  conditions or Hazardous  Materials in, on, under, about
or related to the Company,  its operations or the real properties  leased by the
Company.

            (i) neither the Company nor its  operations  is subject to reporting
requirements  under the federal Emergency  Planning and Community  Right-to-Know
Act, 42 U.S.C.  (beta) 11001 et seq.,  or analogous  state  statutes and related
regulations.

            2.25. Fluid Management Agreement Representations
                  ------------------------------------------

            All  representations  and warranties of the Company and, to the best
of the Company's  knowledge,  all the  representations  and  warranties of Fluid
Management,  Inc.  contained  in the  Fluid  Management  Agreement  are true and
correct in all material respects.

            2.26. Brokerage
                  ---------

            There are no claims for  brokerage  commissions  or finder's fees or
similar  compensation in connection with the  transactions  contemplated by this
Agreement  based on any  arrangement  made by or on behalf of the Company (other
than Allen & Company  Incorporated,  whose fees and  expenses  shall be the sole
responsibility  of the  Company) and the Company  agrees to  indemnify  and hold
Warburg  harmless  against any costs or damages incurred as a result of any such
claim.



                                       13
<PAGE>



            2.27. Illegal or Unauthorized Payments; Political Contributions
                  ---------------------------------------------------------

            Neither the Company or any of its  subsidiaries  nor, to the best of
the  Company's   knowledge  (after  reasonable   inquiry  of  its  officers  and
directors),  any  of  the  officers,  directors,   employees,  agents  or  other
representatives  of the Company or any of its subsidiaries or any other business
entity or  enterprise  with which the Company or any  subsidiary  is or has been
affiliated or associated,  has,  directly or indirectly,  made or authorized any
payment, contribution or gift of money, property, or services, whether or not in
contravention of applicable law, (a) as a kickback or bribe to any Person or (b)
to any political organization,  or the holder of or any aspirant to any elective
or  appointive  public office except for personal  political  contributions  not
involving  the  direct or  indirect  use of funds of the  Company  or any of its
subsidiaries.

            2.28. Takeover Statute
                  ----------------

            Assuming  Warburg and its  "associates" and "affiliates" (as defined
in Section 203 of the  Delaware  Code)  collectively  beneficially  own and have
beneficially  owned at all times  during the three year period prior to the date
hereof less than fifteen percent (15%) of the Common Stock outstanding,  Section
203 of the Delaware Code is, and shall be,  inapplicable  to this  Agreement and
the transactions contemplated hereby.

            2.29. Material Facts
                  --------------

            This Agreement, the schedules furnished  contemporaneously herewith,
and  the  other  agreements,   documents,  certificates  or  written  statements
furnished or to be furnished to Warburg through the Closing Date by or on behalf
of the Company in connection with the transactions  contemplated hereby taken as
a whole, do not contain any untrue statement of a material fact or omit to state
a material fact necessary to make the statements contained therein or herein, in
light of the circumstances in which they were made, not misleading.  There is no
fact which is known to the  Company  (other  than  general  economic or industry
conditions) and which has not been disclosed  herein or otherwise by the Company
to Warburg  which may  materially  adversely  affect the  business,  properties,
assets or condition, financial or otherwise, of the Company and its subsidiaries
taken as a whole.



                                       14
<PAGE>



SECTION 3.  REPRESENTATIONS AND WARRANTIES OF WARBURG

            Warburg represents and warrants to the Company as follows:

            (a) It has full power and legal right to execute  and  deliver  this
Agreement and to perform its obligations hereunder.

            (b) It is a validly existing limited partnership, duly organized and
in good standing under the laws of Delaware.

            (c) It  has  taken  all  action  necessary  for  the  authorization,
execution,  delivery,  and  performance  of this  Agreement and its  obligations
hereunder.  This  Agreement has been duly and validly  executed and delivered by
Warburg and constitutes the valid and binding obligation of Warburg, enforceable
against Warburg in accordance with its terms,  except that such  enforcement may
be  limited  by  bankruptcy,  insolvency,  reorganization,  moratorium  or other
similar  laws now or  hereafter  in effect  relating  to  creditors'  rights and
general principles of equity.

            (d) There are no claims for brokerage  commissions  or finder's fees
or similar compensation in connection with the transactions contemplated by this
Agreement based on any  arrangement  made by or on behalf of Warburg (other than
Ivan  Burns  and  Alan  Craft,  whose  fees  and  expenses  shall  be  the  sole
responsibility  of Warburg) and Warburg agrees to indemnify and hold the Company
harmless against any costs or damages incurred as a result of any such claim.

            (e) The  execution  and delivery by Warburg of this  Agreement,  the
performance  by Warburg of its  obligations  hereunder and the  consummation  by
Warburg of the transactions contemplated hereby do not require Warburg to obtain
any  consent,  approval or action of, or make any filing with or give any notice
to, any  corporation,  person or firm or any  public,  governmental  or judicial
authority,  other  than  consents,  approvals,  actions,  filings  or notices in
connection with the HSR Act.

            (f) It  understands  (subject  to  the  express  obligations  of the
Company to register the Shares as provided in the Registration Rights Agreement)
that the issuance of the Shares is exempt from registration  pursuant to Section
4(2) of the Securities Act and/or  Regulation D promulgated under the Securities
Act ("Regulation D"), and that the reliance of the Company on such exemptions is
predicated   in  part  on  its   representations,   warranties,   covenants  and
acknowledgments set forth in this Section.



                                       15
<PAGE>



            (g) It is an  Accredited  Investor,  as  that  term  is  defined  in
Regulation D, and has such  knowledge  and  experience in financial and business
matters  that it is fully  capable  of  evaluating  the risks and  merits of its
investment in the Shares. The Shares will be acquired by it for its own account,
not as a nominee or agent, for investment and without a view to resale, transfer
or other distribution within the meaning of the Securities Act and the rules and
regulations  thereunder,  and it will not  distribute  nor  transfer  any of the
Shares in violation of the Securities  Act. It is a resident of the State of New
York for purposes of state securities laws.

            (h) It: (i)  acknowledges  that the Shares are not registered  under
the  Securities  Act and must be held  indefinitely  by it unless the Shares are
subsequently  registered  under  the  Securities  Act (in  accordance  with  the
Registration Rights Agreement or otherwise) or an exemption from registration is
available,  (ii) is aware that any  routine  sales of the Shares made under Rule
144 of the  Securities and Exchange  Commission  under the Securities Act may be
made only in limited  amounts and in accordance with the terms and conditions of
that Rule and that in such cases where the Rule is not applicable,  registration
or compliance with some other registration exemption will be required,  (iii) is
aware  that  Rule 144 is not  presently,  and for a period of at least two years
following the Closing Date hereof probably will not be,  available for use by it
for resale of the Shares, and (iv) is aware that the Company is not obligated to
register  any  sale,  transfer  or other  disposition  of the  Shares  except in
accordance with the provisions of the Registration Rights Agreement.

            (i) It  acknowledges  receipt  of the SEC  Reports  and  such  other
documents,  agreements  and  information  as it has  required  and  confirms and
acknowledges  that:  (i) the Company  has  afforded  it the  opportunity  to ask
questions of and receive  answers  from the  Company's  officers  and  directors
concerning  the terms and conditions of this Agreement and its investment in the
Shares and to obtain such additional  information as it has requested,  and (ii)
it has availed itself of such  opportunity to the extent it deems  necessary and
has received the information requested.

            (j) It acknowledges  and agrees that the  certificates  representing
the  Shares  issuable  to it  will  contain  a  restrictive  legend  noting  the
restrictions  on transfer  described in this Section 3 and Section 4.1(a) hereof
and under federal and applicable  state  securities  laws, and that  appropriate
"stop-transfer"  instructions  will be given  to the  Company's  stock  transfer
agent.



                                       16
<PAGE>



SECTION 4.  ADDITIONAL COVENANTS OF THE PARTIES

            4.1. Resale of Securities

            (a) Subject to the provisions of Section 3 hereof, Warburg covenants
that it will not sell or otherwise  transfer any Shares until one (1) year after
the Closing Date without the written consent of the Company.

            (b) In order to ensure  compliance  with the provisions of Section 3
hereof,  Warburg covenants and agrees that, after the Closing, it will not sell,
transfer  or  otherwise  dispose  of any of the Shares or any  interest  therein
(unless  such  sale,  transfer  or  disposition  has been  registered  under the
Securities  Act in  accordance  with the  provisions  of  Section  7  hereof  or
otherwise) or otherwise  without there first having been  compliance with either
of the following conditions:

                (i) the Company shall have received a written opinion of counsel
            in form and substance reasonably  satisfactory to the Company, which
            counsel  shall  include  Willkie  Farr &  Gallagher,  or a copy of a
            "no-action" or interpretive letter of the SEC, specifying the nature
            and  circumstances of the proposed  transfer and indicating that the
            proposed  transfer will not be in violation of any of the provisions
            of the  Securities  Act and the  rules and  regulations  promulgated
            thereunder; or

                (ii) the Company  shall have  received  an opinion  from its own
            counsel  to the effect  that the  proposed  transfer  will not be in
            violation of any of the  provisions  of the  Securities  Act and the
            rules and regulations promulgated thereunder.

            4.2. Covenants Pending Closing
                 -------------------------

            Pending the Closing the Company will not,  without  Warburg's  prior
written   consent,   take  any  action   which  would   result  in  any  of  the
representations or warranties  contained in this Agreement not being true at and
as of the  time  immediately  after  such  action,  or in  any of the  covenants
contained in this Agreement becoming incapable of performance.  The Company will
promptly  advise  Warburg of any action or event of which it becomes aware which
has the effect of making incorrect any of such  representations or warranties or
which  has  the  effect  of  rendering  any  of  such  covenants   incapable  of
performance.



                                       17
<PAGE>



            4.3. Further Assurance
                 -----------------

            Each of the parties  shall  execute such  documents and other papers
and take such  further  actions as may be  reasonably  required or  desirable to
carry out the provisions hereof and the transactions  contemplated  hereby. Each
such party shall use its reasonable efforts to fulfill or obtain the fulfillment
of the conditions to the Closing as promptly as practicable.

            4.4. Board Nominee
                 -------------

            For so long as Warburg owns beneficially (within the meaning of Rule
13d-3 under the Exchange Act) at least 7.5% of the issued and outstanding shares
of the  Company's  Common  Stock,  the Company  will  nominate  and use its best
efforts to elect and to cause to remain as a director on the Company's  Board of
Directors one  individual as Warburg may designate.  Any vacancy  created by the
death, disability, retirement or removal of any such individual may be filled by
Warburg. The initial nominee of Warburg shall be Robert S. Hillas.

            4.5. Hart-Scott-Rodino
                 -----------------

            As promptly as  practicable  following the execution and delivery of
this  Agreement by the parties,  the Company and Warburg  shall each prepare and
file,  or shall  cause its  "ultimate  parent"  (as  defined  in the HSR Act) to
prepare and file, any required  notification  and report form under the HSR Act,
in connection with the transactions  contemplated  hereby, each party paying its
own filing fees;  the Company and Warburg  shall,  or shall cause their ultimate
parents to, take or cause to be taken all actions and do or cause to be done all
things  necessary,  proper or  advisable  to obtain  prompt  termination  of the
waiting period under the HSR Act.

SECTION 5.  WARBURG'S CLOSING CONDITIONS

            The  obligation of Warburg to purchase and pay for the Shares on the
Closing  Date,  as  provided  in  Section  1  hereof,  shall be  subject  to the
performance  by  the  Company  of its  agreements  theretofore  to be  performed
hereunder and to the satisfaction,  prior thereto or concurrently  therewith, of
the following further conditions:

            5.1. Representations and Warranties

            The  representations and warranties of the Company contained in this
Agreement  shall be true on and as of the Closing Date as though such warranties
and  representations  were



                                       18
<PAGE>



made at and as of such date,  except as otherwise  affected by the  transactions
contemplated hereby.

            5.2. Compliance with Agreement
                 -------------------------

            The Company shall have  performed and complied with all  agreements,
covenants and conditions  contained in this  Agreement  which are required to be
performed or complied with by the Company prior to or on the Closing Date.

            5.3. Officer's Certificate
                 ---------------------

            Warburg shall have received a  certificate,  dated the Closing Date,
signed on behalf of the Company by each of the President  and the  Controller of
the Company,  certifying that the conditions specified in the foregoing Sections
5.1 and 5.2 hereof have been fulfilled.

            5.4. Injunction
                 ----------

            There  shall  be  no   effective   injunction,   writ,   preliminary
restraining  order or any order of any  nature  issued  by a court of  competent
jurisdiction  directing that the transactions provided for herein or any of them
not be consummated as herein provided.

            5.5. Counsel's Opinion
                 -----------------

            Warburg  shall have received  from the  Company's  counsel,  Drinker
Biddle & Reath, an opinion, dated the Closing Date, substantially in the form of
Exhibit C hereto.

            5.6. Acquisition of Fluid Management
                 -------------------------------

            All conditions to the consummation of the transactions  contemplated
by the Fluid  Management  Agreement shall have been satisfied or waived with the
consent of Warburg in its sole and absolute discretion.

            5.7. Consents; Hart-Scott-Rodino
                 ---------------------------

            All consents, approvals and actions which are listed on Schedule 2.5
hereto shall have been obtained or performed, and all applicable waiting periods
(and any  extensions  thereof) under the HSR Act shall have expired or otherwise
been terminated.



                                       19
<PAGE>



            5.8. Election of Directors
                 ---------------------

            Robert S. Hillas (in accordance with Section 4.4 hereof) and William
C. Smith  shall  have been  elected to the Board of  Directors  of the  Company,
effective upon the Closing.

            5.9. Registration Rights Agreement
                 -----------------------------

            The Company, Warburg and the shareholders of Fluid Management,  Inc.
shall have entered into the Registration  Rights  Agreement,  the terms of which
shall be satisfactory to the Company and Warburg.

            5.10. Approval of Proceedings
                  -----------------------

            All  proceedings  to be taken in  connection  with the  transactions
contemplated by this Agreement,  and all documents  incident  thereto,  shall be
satisfactory in form and substance to Warburg and its special  counsel,  Willkie
Farr & Gallagher;  and Warburg  shall have  received  copies of all documents or
other  evidence  which it and Willkie Farr & Gallagher may request in connection
with such transactions and of all records of corporate proceedings in connection
therewith  in form and  substance  satisfactory  to Warburg and  Willkie  Farr &
Gallagher.

SECTION 6.  COMPANY CLOSING CONDITIONS

            The obligation of the Company to issue and deliver the Shares on the
Closing  Date,  as  provided  in  Section  1  hereof,  shall be  subject  to the
performance by Warburg of its agreements  theretofore to be performed  hereunder
and to  the  satisfaction,  prior  thereto  or  concurrently  therewith,  of the
following further conditions:

            6.1. Representations and Warranties
                 ------------------------------

            The  representations  and  warranties  of Warburg  contained in this
Agreement  shall be true on and as of the Closing Date as though such warranties
and  representations  were  made at and as of such  date,  except  as  otherwise
affected by the transactions contemplated hereby.

            6.2. Compliance with Agreement
                 -------------------------

            Warburg  shall have  performed  and  complied  with all  agreements,
covenants and conditions  contained in this  Agreement  which are required to be
performed or complied with by it prior to or on the Closing Date.



                                       20
<PAGE>



            6.3. Warburg's Certificate
                 ---------------------

            The Company shall have received a  certificate  from Warburg,  dated
the  Closing  Date,  signed  by a duly  authorized  representative  of  Warburg,
certifying that the conditions  specified in the foregoing  Sections 6.1 and 6.2
hereof have been fulfilled.

            6.4. Consents; Hart-Scott-Rodino
                 ---------------------------

            All consents, approvals and actions which are listed on Schedule 2.5
hereto shall have been obtained or performed, and all applicable waiting periods
(and any  extensions  thereof) under the HSR Act shall have expired or otherwise
been terminated.

            6.5. Injunction
                 ----------

            There  shall  be  no   effective   injunction,   writ,   preliminary
restraining  order or any order of any  nature  issued  by a court of  competent
jurisdiction  directing that the transactions provided for herein or any of them
not be consummated as herein provided.

            6.6. Acquisition of Fluid Management
                 -------------------------------

            All conditions to the consummation of the transactions  contemplated
by the Fluid Management Agreement shall have been satisfied or waived.

SECTION 7.  RESERVED


SECTION 8.  COVENANTS

            8.1. Confidentiality
                 ---------------

            As to so much of the information and other material  furnished under
or in connection with this Agreement  (whether furnished before, on or after the
date hereof,  including without  limitation  information  furnished  pursuant to
Section 8.1 hereof) as constitutes or contains confidential business,  financial
or other  information of the Company or any  subsidiary,  Warburg  covenants for
itself and its  directors,  officers and  partners  that it will use due care to
prevent its officers,  directors,  partners, employees, counsel, accountants and
other  representatives  from disclosing  such  information to Persons other than
their respective authorized employees, counsel, accountants,  partners and other
authorized  representatives;  provided,  however,  that  Warburg may disclose or
deliver any information or other material  disclosed to or received by it should
Warburg be advised



                                       21
<PAGE>



by its counsel that such  disclosure or delivery is required by law,  regulation
or  judicial  or  administrative  order.  In the  event of  termination  of this
Agreement for any reason, upon the written request of the Company,  Warburg will
promptly return or cause to be returned to the Company,  or promptly  destroy or
cause to be  destroyed,  all such  information  and material  obtained  from the
Company, and any copies made of such information and materials.  For purposes of
this Section 8.1,  "due care" means at least the same level of care that Warburg
would use to protect the  confidentiality  of its own  sensitive or  proprietary
information, and this obligation shall survive termination of this Agreement.

            8.2.  Lost,  etc.  Certificates  Evidencing  Shares of Common Stock;
                  Exchange
                  --------------------------------------------------------------

            Upon receipt by the Company of evidence  reasonably  satisfactory to
it of the loss, theft,  destruction or mutilation of any certificate  evidencing
any shares of Common Stock owned by Warburg,  and (in the case of loss, theft or
destruction)   of  an  unsecured   indemnity   satisfactory   to  it,  and  upon
reimbursement to the Company of all reasonable expenses incidental thereto,  and
upon surrender and cancellation of such certificate,  if mutilated,  the Company
will make and  deliver in lieu of such  certificate  a new  certificate  of like
tenor and for the number of shares  evidenced by such  certificate  which remain
outstanding.   Warburg's  agreement  of  indemnity  shall  constitute  indemnity
satisfactory  to the Company for purposes of this Section 8.2. Upon surrender of
any  certificate  representing  any shares of Common  Stock for  exchange at the
office of the  Company,  the Company at its  expense  will cause to be issued in
exchange  therefor new certificates in such denomination or denominations as may
be requested for the same  aggregate  number of shares of Common  Stock,  as the
case may be,  represented by the  certificate  so surrendered  and registered as
such holder may request. The Company will also pay the cost of all deliveries of
certificates  for such  shares to the office of Warburg  (including  the cost of
insurance  against loss or theft in an amount  satisfactory to the holders) upon
any exchange provided for in this Section 8.2.

SECTION 9.  INTERPRETATION OF THIS AGREEMENT

            9.1. Terms Defined

            As used in this  Agreement,  the following terms have the respective
meanings set forth below or set forth in the Section hereof following such term:



                                       22
<PAGE>



            Affiliate:  means any  Person or  entity,  directly  or  indirectly,
controlling, controlled by or under common control with such Person or entity.

            Business  Day:  shall  mean a day other than a  Saturday,  Sunday or
other day on which banks in the State of New York are required or  authorized to
close.

            Closing: shall have the meaning set forth in Section 1.1(b).

            Closing Date: shall have the meaning set forth in Section 1.1(b).

            Code: shall mean the Internal Revenue Code of 1986, as amended.

            Common Stock: shall have the meaning set forth in Section 1.1(a).

            Exchange  Act:  shall mean the  Securities  Exchange Act of 1934, as
amended.

            Fluid  Management  Agreement:  shall mean the  Agreement and Plan of
Merger among the Company,  Fluid Management,  Inc. and William C. Smith, Douglas
W. Jacobson, Gary W. Hawk and Richard W. Schowengerdt, dated January 14, 1997.

            GAAP: shall have the meaning set forth in Section 2.7.

            HSR Act: refers to the Hart-Scott-Rodino  Antitrust Improvements Act
of 1976, as amended.

            Intellectual  Property:  shall have the meaning set forth in Section
2.16.

            Material Adverse Effect: shall have the meaning set forth in Section
2.1(c).

            Person: shall mean an individual, partnership,  joint-stock company,
corporation,  limited liability company,  trust or unincorporated  organization,
and a government or agency or political subdivision thereof.

            Registration  Rights  Agreement:  shall mean a  registration  rights
agreement  to entered into by the Company,  Warburg and Fluid  Management,  Inc.
relating  to the  registration  of the Shares  and shares of Common  Stock to be
acquired  by  the  shareholders  of  Fluid  Management,  Inc.,  pursuant  to the



                                       23
<PAGE>



preparation  and  filing of a  registration  statement  in  compliance  with the
Securities Act.

            SEC: shall mean the Securities and Exchange Commission.

            SEC Reports: shall have the meaning set forth in Section 2.7.

            Securities Act: shall mean the Securities Act of 1933, as amended.

            Subsidiary:  shall  mean a  corporation  of  which  a  Person  owns,
directly or indirectly, more than 50% of the Voting Stock.

                  Voting Stock: shall mean securities of any class or classes of
a  corporation  the  holders  of  which  are  ordinarily,   in  the  absence  of
contingencies,  entitled  to elect a majority  of the  corporate  directors  (or
Persons performing similar functions).

            9.2. Accounting Principles
                 ---------------------

            Where the character or amount of any asset or amount of any asset or
liability  or item of income or  expense is  required  to be  determined  or any
consolidation  or other  accounting  computation  is required to be made for the
purposes of this  Agreement,  this shall be done in accordance  with GAAP at the
time in effect,  to the extent  applicable,  except  where such  principles  are
inconsistent with the requirements of this Agreement.

            9.3. Directly or Indirectly
                 ----------------------

            Where any provision in this  Agreement  refers to action to be taken
by any Person,  or which such Person is prohibited  from taking,  such provision
shall be applicable  whether such action is taken directly or indirectly by such
Person.

            9.4. Governing Law
                 -------------

            This Agreement shall be governed by and construed in accordance with
the  laws of the  State  of New  York  applicable  to  contracts  made and to be
performed entirely within such State.

            9.5. Paragraph and Section Headings
                 ------------------------------

            The headings of the sections and  subsections  of this Agreement are
inserted  for  convenience  only and shall not be  deemed to  constitute  a part
thereof.



                                       24
<PAGE>



SECTION 10.  MISCELLANEOUS

            10.1. Notices
                  -------

            (a) All communications  under this Agreement shall be in writing and
shall be delivered by hand or mailed by overnight  courier or by registered mail
or certified mail, postage prepaid:

            (1) if to  Warburg,  at 466  Lexington  Avenue,  New York,  New York
10017,  marked for  attention of Robert S. Hillas,  or at such other  address as
Warburg may have furnished the Company in writing,

            (2) if to the Company, at 4100 Quakerbridge Road, Lawrenceville,  NJ
08648, marked for the attention of Harch S. Gill, or at such other address as it
may have furnished in writing to Warburg.

            (b) Any  notice  so  addressed  shall  be  deemed  to be  given:  if
delivered by hand, on the date of such  delivery;  if mailed by courier,  on the
first  business  day  following  the  date of such  mailing;  and if  mailed  by
registered or certified  mail, on the third  business day after the date of such
mailing.

            10.2. Expenses and Taxes
                  ------------------

            (a)  The  Company  agrees  to pay  fifty  percent  (50%)  of the fee
required  to be paid  under  the  HSR Act in  connection  with  the  transaction
contemplated  hereby and the reasonable fees and disbursements of Willkie Farr &
Gallagher,  special  counsel  for  Warburg,  incurred  in  connection  with  the
negotiation, preparation, execution and delivery of this Agreement and the other
instruments  and  agreements  entered into pursuant to this  Agreement,  and any
amendments to the same, in an amount not to exceed  $50,000.00,  said payment to
be made no later  than 30 days after a bill for such fees  and/or  disbursements
has been sent to the  Company  (provided,  however,  that in no event shall said
payment  be  required  to be made by the  Company  prior to the  Closing  Date).
Notwithstanding  the  foregoing,  (i) the Company shall be required to pay fifty
percent (50%) of such legal fees and expenses in an amount not to exceed $25,000
in  the  event  that  the  transactions  contemplated  by the  Fluid  Management
Agreement are not  consummated  as a result of the failure by Fluid  Management,
Inc. or its  stockholders to satisfy the conditions set forth in Section 6.02 of
the Fluid  Management  Agreement  on or prior to the  Closing  Date and (ii) the
Company  shall not be  required  to pay any such legal fees and  expenses in the
event that the transactions  contemplated hereby are not consummated as a result
of the failure by Warburg to satisfy the  conditions  set



                                       25
<PAGE>



forth in Sections  6.1,  6.2, 6.3, 6.4, or 6.5 hereto on or prior to the Closing
Date.

            (b) The Company will pay, and save and hold  Warburg  harmless  from
any and all liabilities  (including  interest and penalties) with respect to, or
resulting from any delay or failure in paying, stamp and other taxes (other than
income  taxes),  if any, which may be payable or determined to be payable on the
acquisition by Warburg of the Shares.

            10.3. Reproduction of Documents
                  -------------------------

            This  Agreement  and  all  documents  relating  thereto,  including,
without limitation,  (a) consents, waivers and modifications which may hereafter
be executed,  (b) documents  received by Warburg on the Closing Date (except for
certificates  evidencing the Shares themselves),  and (c) financial  statements,
certificates and other information previously or hereafter furnished to Warburg,
may be  reproduced  by  Warburg  by any  photographic,  photostatic,  microfilm,
micro-card,  miniature  photographic  or other  similar  process and Warburg may
destroy any  original  document so  reproduced.  All  parties  hereto  agree and
stipulate  that any such  reproduction  shall be  admissible  in evidence as the
original itself in any judicial or administrative proceeding (whether or not the
original  is in  existence  and  whether  or not such  reproduction  was made by
Warburg in the regular course of business) and that any  enlargement,  facsimile
or further  reproduction  of such  reproduction  shall likewise be admissible in
evidence.

            10.4. Termination and Survival
                  ------------------------

            Unless the Closing has occurred prior  thereto,  this Agreement and,
except as herein provided, all the rights of the parties hereto, shall terminate
on May 31,  1997  (unless  such date is  extended  by mutual  written  consent).
Notwithstanding  the  termination  of this  Agreement,  Section 8.1 hereof shall
survive the termination of this Agreement. All warranties,  representations, and
covenants made by Warburg to the Company,  or by the Company to Warburg,  herein
or in any  certificate or other  instrument  delivered by Warburg or the Company
under this Agreement shall be considered to have been relied upon by the Company
or Warburg,  as the case may be, and shall survive all  deliveries to Warburg of
the Shares,  or payment to the Company for such Shares,  until the thirtieth day
following the date on which Warburg  receives the  Company's  audited  financial
statements  for the  fiscal  year  ending  December  31,  1997,  except  for the
warranties and representations set forth in Sections 2.14 and 2.24 herein, which
shall  survive  until  expiration  of any  applicable  statute  of  limitations,
regardless of any



                                       27
<PAGE>



investigation  made by the  Company  or  Warburg,  as the case may be, or on the
Company's or Warburg's  behalf.  All statements in any such certificate or other
instrument shall constitute  warranties and  representations  by the Company and
Warburg, as the case may be, hereunder.

            10.5. Successors and Assigns
                  ----------------------

            This Agreement shall inure to the benefit of and be binding upon the
successors and assigns of each of the parties.

            10.6. Entire Agreement; Amendment and Waiver
                  --------------------------------------

            This Agreement  constitutes the entire understandings of the parties
hereto and supersede all prior agreements or understandings  with respect to the
subject matter hereof among such parties. This Agreement may be amended, and the
observance of any term of this Agreement may be waived, with (and only with) the
written consent of the Company and Warburg.

            10.7. Severability
                  ------------

            In the event that any part or parts of this Agreement  shall be held
illegal  or  unenforceable  by any  court or  administrative  body of  competent
jurisdiction,  such determination  shall not effect the remaining  provisions of
this Agreement which shall remain in full force and effect.

            10.8. Limitation on Enforcement of Remedies
                  -------------------------------------

            The  Company  hereby  agrees  that it will not  assert  against  the
limited partners of Warburg any claim it may have under this Agreement by reason
of any failure or alleged failure by Warburg to meet its obligations hereunder.

            10.9. Counterparts
                  ------------

            This Agreement may be executed in one or more counterparts,  both of
which shall be deemed an original and all of which  together shall be considered
one and the same agreement.


                                                   Very truly yours,

                                                   ENVIROGEN, INC.


                                                   By:/s/ Harcharan S. Gill
                                                      -----------------------
                                                   Name: Harcharan S. Gill
                                                   Title: President and Chief
                                                          Executive Officer



                                       28
<PAGE>





WARBURG, PINCUS VENTURES, L.P.

By:  WARBURG, PINCUS & CO.,
     General Partner


     By:
          /s/ Robert S. Hillas
     Name:  Robert S. Hillas
     Title: Partner



                                       29



<PAGE>



                                 ENVIROGEN, INC.

                          REGISTRATION RIGHTS AGREEMENT


         REGISTRATION RIGHTS AGREEMENT, dated as of April 10, 1997, among the
investors listed on Schedule I hereto (the "Investors") and Envirogen, Inc., a
Delaware corporation (the "Company").

                                 R E C I T A L S

         WHEREAS, Warburg, Pincus Ventures, L.P., a Delaware limited partnership
("Warburg"), has agreed, pursuant to the terms of the Securities Purchase
Agreement, dated as of January 14, 1997, by and between Warburg and the Company
(the "Purchase Agreement"), to purchase 6,095,238 shares of the common stock,
par value $0.01 per share, of the Company (the "Common Stock") at the aggregate
cash purchase price of $15,999,999.75; and

         WHEREAS, the Company has agreed, as a condition precedent to the
Warburg's obligations under the Purchase Agreement, to grant Warburg certain
registration rights; and

         WHEREAS, pursuant to the Agreement and Plan of Merger, dated January
14, 1997 (the "Merger Agreement"), by and among the Company, Fluid Management,
Inc., a Wisconsin corporation ("Fluid Management"), and William C. Smith,
Douglas W. Jacobson, Gary W. Hawk and Richard W. Schowengerdt (Messrs. Smith,
Jacobson, Hawk and Schowengerdt collectively, the "Other Investors"), the Other
Investors shall receive, collectively, 4,190,477 shares of Common Stock in
connection with the transactions contemplated by the Merger Agreement and

         WHEREAS, the Company has agreed, as a condition precedent to Fluid
Management's and the Other Investor's obligations under the Merger Agreement, to
grant the Other Investors certain registration rights; and

         WHEREAS, the Investors and the Company desire to define the
registration rights of the Investors on the terms and subject to the conditions
herein set forth.

         NOW, THEREFORE, in consideration of the foregoing premises and for
other good and valuable consideration, the parties hereby agree as follows:



<PAGE>





         1.   DEFINITIONS
              -----------

         As used in this Agreement, the following terms have the respective
meaning set forth below:

         Commission: shall mean the Securities and Exchange Commission or any
other federal agency at the time administering the Securities Act;

         Exchange Act: shall mean the Securities Exchange Act of 1934, as
amended;

         Holder: shall mean any holder of Registrable Securities;

         Person: shall mean an individual, partnership, joint-stock company,
corporation, trust or unincorporated organization, and a government or agency or
political subdivision thereof;

         register, registered and registration: shall mean to a registration
effected by preparing and filing a registration statement in compliance with the
Securities Act (and any post-effective amendments filed or required to be filed)
and the declaration or ordering of effectiveness of such registration statement;

         Registrable Securities: shall mean (A) shares of Common Stock acquired
by Warburg pursuant to the Purchase Agreement and shares of Common Stock
acquired by the Other Investors pursuant to the Merger Agreement, and (B) any
common stock of the Company issued as a dividend or other distribution with
respect to, or in exchange for or in replacement of, the shares of Common Stock
referred to in clause (A);

         Registration Expenses: shall mean all expenses incurred by the Company
in compliance with Section 2 hereof, including, without limitation, all
registration and filing fees, printing expenses, fees and disbursements of
counsel for the Company, fees and expenses of one counsel for all the Holders in
an amount not to exceed $15,000 in connection with an underwritten transaction
or $5,000 in connection with a non-underwritten transaction, blue sky fees and
expenses and the expense of any special audits incident to or required by any
such registration (but excluding the compensation of regular employees of the
Company, which shall be paid in any event by the Company);

         Security, Securities: shall have the meaning set forth in Section 2(1)
of the Securities Act;





                                     -2-



<PAGE>


         Securities Act: shall mean the Securities Act of 1933, as amended; and
Selling Expenses: shall mean all underwriting discounts and selling commissions
applicable to the sale of Registrable Securities and all fees and disbursements
of counsel for each of the Holders other than fees and expenses of one counsel
for all the Holders in an amount not to exceed $15,000 in connection with an
underwritten transaction or $5,000 in connection with a non-underwritten
transaction.

         2.   REGISTRATION RIGHTS
              -------------------

              (a) Shelf Registration.
                  ------------------

              (i)   As soon as practicable after the Closing Date, but in any
         event within nine (9) months after the Closing Date, the Company shall
         file with the Commission and cause to be declared effective a
         registration statement pursuant to Rule 415 under the Securities Act (a
         "Shelf Registration Statement") relating to the offer and sale of
         Registrable Securities by the Holders thereof from time to time in
         accordance with the methods of distribution elected by such Holders and
         set forth in such Shelf Registration Statement.

              (ii)  The Company shall supplement or amend, if necessary, the
         Shelf Registration Statement as required by the applicable registration
         form or by the Securities Act or the rules and regulations promulgated
         thereunder or as reasonably requested by the Holders of a majority of
         the Registrable Securities (the "Majority Holders"), and the Company
         shall furnish to the holders of the Registrable Securities to which the
         Shelf Registration Statement relates copies of any such supplement or
         amendment prior to its being used and/or filed with the Commission.

              (b)   Expenses of Registration. All Registration Expenses incurred
in connection with any registration, qualification or compliance pursuant to
this Section 2 shall be borne by the Company, and all Selling Expenses shall be
borne by the Holders of the securities so registered pro rata on the basis of
the number of their shares so registered.

              (c)   Registration Procedures. In connection with the Shelf
Registration Statement filed pursuant to this Section 2, the Company will keep
the Holders, as applicable, advised in writing as to the initiation of such
registration and as to the completion thereof. Subject to Section 2(g) hereof,
at its expense, the Company will, as expeditiously as possible:





                                      -3-



<PAGE>


              (i)  prepare and file with the SEC such amendments and supplements
    to such registration statement and the prospectus used in connection
    therewith as may be necessary to keep such registration statement effective
    and to comply with the provisions of the Securities Act with respect to the
    disposition of all Registrable Securities covered by such registration
    statement or as may be reasonably requested by the Majority Holders, until
    such time (x) as all of such Registrable Securities have been disposed of in
    accordance with the intended methods of disposition by the seller or sellers
    thereof set forth in such registration statement or (y) as set forth in
    Section 2(h) hereof;

              (ii)  use its best efforts (x) to register or qualify all
    Registrable Securities and other securities covered by such registration
    statement under such other securities or blue sky laws of such States of the
    United States of America where an exemption is not available and as the
    sellers of Registrable Securities covered by such registration statement
    shall reasonably request, (y) to keep such registration or qualification in
    effect for so long as such registration statement remains in effect, and (z)
    to take any other action which may be reasonably necessary or advisable to
    enable such sellers to consummate the disposition in such jurisdictions of
    the securities to be sold by such sellers, except that the Company shall not
    for any such purpose be required to qualify generally to do business as a
    foreign corporation in any jurisdiction wherein it would not but for the
    requirements of this subdivision (ii) be obligated to be so qualified,
    subject itself to taxation in any such jurisdiction or to consent to general
    service of process in any such jurisdiction;

              (iii) use its best efforts to cause all Registrable Securities
    covered by such registration statement to be registered with or approved by
    such other federal or state governmental agencies or authorities as may be
    necessary in the opinion of counsel to the Company and counsel to the seller
    or sellers of Registrable Securities to enable the seller or sellers thereof
    to consummate the disposition of such Registrable Securities;

              (iv) promptly notify each Holder of Registrable Securities covered
    by such registration statement at any time when a prospectus relating
    thereto is required to be delivered under the Securities Act, upon discovery
    that, or upon the happening of any event as a result of which, the
    prospectus included in such registration statement, as then in effect,
    includes an untrue statement of a material fact






                                      -4-



<PAGE>


    or omits to state any material fact required to be stated therein or
    necessary to make the statements therein not misleading, in the light of the
    circumstances under which they were made, and at the request of any such
    Holder promptly prepare and furnish to it a reasonable number of copies of a
    supplement to or an amendment of such prospectus as may be necessary so
    that, as thereafter delivered to the purchasers of such securities, such
    prospectus shall not include an untrue statement of a material fact or omit
    to state a material fact required to be stated therein or necessary tomake
    the statements therein not misleading in the light of the circumstances
    under which they were made;

              (v) furnish, on the date that such Registrable Securities are
    delivered to the underwriters for sale, if such securities are being sold
    through underwriters, (1) an opinion, dated as of such date, of the counsel
    representing the Company for the purposes of such registration, in form and
    substance as is customarily given to underwriters in an underwritten public
    offering and reasonably satisfactory to a majority in interest of the
    Holders participating in such registration, addressed to the underwriters
    and to the Holders participating in such registration and (2) a letter,
    dated as of such date, from the independent certified public accountants of
    the Company, in form and substance as is customarily given by independent
    certified public accountants to underwriters in an underwritten public
    offering and reasonably satisfactory to a majority in interest of the
    Holders participating in such registration, addressed to the underwriters,
    and if permitted by applicable accounting standards, to the Holders
    participating in such registration; and

              (vi) otherwise use its best efforts to comply with all applicable
    rules and regulations of the Commission, and make available to its security
    holders, as soon as reasonably practicable, an earnings statement covering
    the period of at least twelve months, but not more than eighteen months,
    beginning with the first full calendar month after the effective date of
    such registration statement, which earnings statement shall satisfy the
    provisions of Section 11(a) of the Securities Act and Rule 158 promulgated
    thereunder, and promptly furnish to each Holder of Registrable Securities a
    copy of any amendment or supplement to such registration statement or
    prospectus.

           Notwithstanding the foregoing, if any such registration or
comparable statement refers to any Holder by name or otherwise as the holder of
any securities of the Company and in its sole and exclusive judgment such Holder
is or might be deemed to be a





                                      -5-



<PAGE>


controlling person of the Company, such Holder shall have the right to require
the insertion therein of language, in form and substance reasonably satisfactory
to such Holder and the Company, to the effect that the holding by such Holder of
such securities is not to be construed as a recommendation by such Holder of the
investment quality of the Company's securities covered thereby and that such
holding does not imply that such Holder will assist in meeting any future
financial requirements of the Company.

              (d)   Indemnification.
                    ---------------

              (i) The Company will indemnify each of the Holders, as applicable,
    each of its officers, directors and partners, and each person controlling
    each of the Holders, with respect to the registration which has been
    effected pursuant to this Section 2, and each underwriter, if any, and each
    person who controls any underwriter, against all claims, losses, damages and
    liabilities (or actions in respect thereof) arising out of or based on any
    untrue statement (or alleged untrue statement) of a material fact contained
    in any prospectus, offering circular or other document (including any
    related registration statement, notification or the like) incident to any
    such registration, qualification or compliance, or based on any omission (or
    alleged omission) to state therein a material fact required to be stated
    therein or necessary to make the statements therein not misleading, or any
    violation by the Company of the Securities Act or any rule or regulation
    thereunder applicable to the Company and relating to action or inaction
    required of the Company in connection with any such registration,
    qualification or compliance, and will reimburse each of the Holders, each of
    its officers, directors and partners, and each person controlling each of
    the Holders, each such underwriter and each person who controls any such
    underwriter, for any reasonable legal and any other expenses incurred in
    connection with investigating and defending any such claim, loss, damage,
    liability or action, provided that the Company will not be liable in any
    such case to the extent that any such claim, loss, damage, liability or
    expense arises out of or is based on any untrue statement or omission based
    upon written information furnished to the Company by the Holders or
    underwriter and stated to be specifically for use therein.

              (ii) Each of the Holders severally will, if Registrable Securities
    held by it are included in the securities as to which such registration,
    qualification or compliance is being effected, indemnify the Company, each
    of its directors and officers and each underwriter, if any, of the Company's
    securities covered by such registration







                                      -6-



<PAGE>


    statement, each person who controls the Company or such underwriter and each
    of their officers, directors, and partners against all claims, losses,
    damages and liabilities (or actions in respect thereof) arising out of or
    based on any untrue statement (or alleged untrue statement) of a material
    fact contained in such registration statement, prospectus, offering circular
    or other document made by such Holder, or any omission (or alleged omission)
    to state therein a material fact required to be stated therein or necessary
    to make the statements by such Holder therein not misleading, and will
    reimburse the Company and such directors, officers, partners, persons,
    underwriters or control persons for any legal or any other expenses
    reasonably incurred in connection with investigating or defending any such
    claim, loss, damage, liability or action, in each case to the extent, but
    only to the extent, that such untrue statement (or alleged untrue statement)
    or omission (or alleged omission) is made in such registration statement,
    prospectus, offering circular or other document in reliance upon and in
    conformity with written information furnished to the Company by such Holder
    and stated to be specifically for use therein; provided, however, that the
    obligations of each of the Holders hereunder shall be limited to an amount
    equal to the net proceeds to such Holder of securities sold as contemplated
    herein.

              (iii) Each party entitled to indemnification under this Section
    2(d) (the "Indemnified Party") shall give notice to the party required to
    provide indemnification (the "Indemnifying Party") promptly after such
    Indemnified Party has actual knowledge of any claim as to which indemnity
    may be sought, and shall permit the Indemnifying Party to assume the defense
    of any such claim or any litigation resulting therefrom; provided that
    counsel for the Indemnifying Party, who shall conduct the defense of such
    claim or any litigation resulting therefrom, shall be approved by the
    Indemnified Party (whose approval shall not unreasonably be withheld) and
    the Indemnified Party may participate in such defense at such party's
    expense (unless the Indemnified Party shall have reasonably concluded that
    there may be a conflict of interest between the Indemnifying Party and the
    Indemnified Party in such action, in which case the fees and expenses of
    counsel shall be at the expense of the Indemnifying Party, provided that in
    such event the Indemnifying Party shall not be responsible for the fees of
    more than one counsel (plus one local counsel) to the Indemnified Parties),
    and provided further that the failure of any Indemnified Party to give
    notice as provided herein shall not relieve the Indemnifying Party of its
    obligations under this Section 2 unless the Indemnifying Party is




                                      -7-



<PAGE>


    materially prejudiced thereby. No Indemnifying Party, in the defense of any
    such claim or litigation shall, except with the consent of each Indemnified
    Party, consent to entry of any judgment or enter into any settlement which
    does not include as an unconditional term thereof the giving by the claimant
    or plaintiff to such Indemnified Party of a release from all liability in
    respect to such claim or litigation. Each Indemnified Party shall furnish
    such information regarding itself or the claim in question as an
    Indemnifying Party may reasonably request in writing and as shall be
    reasonably required in connection with the defense of such claim and
    litigation resulting therefrom.

              (iv) If the indemnification provided for in this Section 2(d) is
    held by a court of competent jurisdiction to be unavailable to an
    Indemnified Party with respect to any loss, liability, claim, damage or
    expense referred to herein, then the Indemnifying Party, in lieu of
    indemnifying such Indemnified Party hereunder, shall contribute to the
    amount paid or payable by such Indemnified Party as a result of such loss,
    liability, claim, damage or expense in such proportion as is appropriate to
    reflect the relative fault of the Indemnifying Party on the one hand and of
    the Indemnified Party on the other in connection with the statements or
    omissions which resulted in such loss, liability, claim, damage or expense,
    as well as any other relevant equitable considerations. The relative fault
    of the Indemnifying Party and of the Indemnified Party shall be determined
    by reference to, among other things, whether the untrue (or alleged untrue)
    statement of a material fact or the omission (or alleged omission) to state
    a material fact relates to information supplied by the Indemnifying Party or
    by the Indemnified Party and the parties' relative intent, knowledge, access
    to information and opportunity to correct or prevent such statement or
    omission.

              (v) Notwithstanding the foregoing, to the extent that the
    provisions on indemnification and contribution contained in the underwriting
    agreement entered into in connection with any underwritten public offering
    contemplated by this Agreement are in conflict with the foregoing
    provisions, the provisions in such underwriting agreement shall be
    controlling.

              (vi) The foregoing indemnity agreement of the Company and the
    Holders is subject to the condition that, insofar as they relate to any
    loss, claim, liability or damage made in a preliminary prospectus but
    eliminated or remedied in the amended prospectus on file with the Commission
    at the time the registration statement in







                                      -8-




<PAGE>




    question becomes effective or the amended prospectus filed with the
    Commission pursuant to Rule 424(b) (the "Final Prospectus"), such indemnity
    agreement shall not inure to the benefit of (i) any underwriter if a copy of
    the Final Prospectus was furnished to the underwriter and was not furnished
    to the person asserting the loss, liability, claim or damage at or prior to
    the time such action is required by the Securities Act and (ii) any Holder
    if the loss, claim, liability or damage relates to a transaction pursuant to
    which shares of Common Stock were not distributed pursuant to an
    underwritten offering and if a copy of the Final Prospectus was furnished to
    the Holder and was not furnished to the person asserting the loss,
    liability, claim or damage at or prior to the time such action is required
    by the Securities Act.

              (e) Information by the Holders.  Each of the Holders holding
securities included in any registration shall furnish to the Company such
information regarding such Holder and the distribution proposed by such Holder
as the Company may reasonably request in writing and as shall be reasonably
required in connection with any registration, qualification or compliance
referred to in this Section 2.





                                      -9-



<PAGE>


              (f) Rule 144 Reporting.
                  ------------------

              With a view to making available the benefits of certain rules and
regulations of the Commission which may permit the sale of restricted securities
to the public without registration, the Company agrees to:

              (i) make and keep public information available as those terms are
    understood and defined in Rule 144 under the Securities Act ("Rule 144");

              (ii) use its best efforts to file with the Commission in a timely
    manner all reports and other documents required of the Company under the
    Securities Act and the Exchange Act; and

              (iii) so long as the Holder owns any Registrable Securities,
    furnish to the Holder upon request, a written statement by the Company as to
    its compliance with the reporting requirements of Rule 144 and of the
    Securities Act and the Exchange Act, a copy of the most recent annual or
    quarterly report of the Company, and such other reports and documents so
    filed as the Holder may reasonably request in availing itself of any rule or
    regulation of the Commission allowing the Holder to sell any such securities
    without registration.

              (g) Holdback Periods.  Notwithstanding anything in this Agreement
to the contrary if (i) the Company shall determine in good faith that it would
be significantly disadvantageous to the Company and its stockholders for any
such Shelf Registration Statement to be amended or supplemented, and (ii) the
need for such an amendment or supplement is not caused by a proposed public
offering of any securities of the Company by any of its securityholders (other
than an offering made pursuant to a registration on Form S-8), the Company may
defer such amending or supplementing of such Shelf Registration Statement for
not more than 60 days and in such event, upon appropriate notice to the Holders,
the Holders shall be required to discontinue disposition of any Registrable
Securities covered by such Shelf Registration Statement during such period;
provided, however, that this right may not be exercised by the Company more than
once in any twelve-month period.

              (h) Termination. The registration rights set forth in this Section
2 shall not be available to any Holder if, in the opinion of counsel to the
Company, all of the Registrable Securities then owned by such Holder could be
sold in any 90-day period pursuant to Rule 144 under the Securities Act (without





                                      -10-



<PAGE>


giving effect to the provisions of Rule 144(k)). Upon termination of such
registration rights in accordance with this Section 2(h), the obligations of the
Company to continue the effectiveness of the Shelf Registration Statement shall
terminate.

              3.   MISCELLANEOUS
                   -------------

              (a) Directly or Indirectly.  Where any provision in this Agreement
refers to action to be taken by any Person, or which such Person is prohibited
from taking, such provision shall be applicable whether such action is taken
directly or indirectly by such Person.

              (b) Governing Law. This Agreement shall be governed by and
construed in accordance with the laws of the State of New York applicable to
contracts made and to be performed entirely within such State.

              (c) Section Headings. The headings of the sections and subsections
of this Agreement are inserted for convenience only and shall not be deemed to
constitute a part thereof.

              (d) Notices.
                  -------

              (i) All communications under this Agreement shall be in writing
    and shall be delivered by hand or mailed by overnight courier or by
    registered or certified mail, postage prepaid:

                  (A) if to the Company, to 4100 Quakerbridge Road,
         Lawrenceville, NJ 08648, Attention: Harch S. Gill, or at such other
         address as it may have furnished in writing to the Investors;

                   (B) if to the Investors, at the addresses listed on Schedule
         I hereto, or at such other addresses as may have been furnished the
         Company in writing.

              (iii) Any notice so addressed shall be deemed to be given: if
    delivered by hand, on the date of such delivery; if mailed by courier, on
    the first business day following the date of such mailing; and if mailed by
    registered or certified mail, on the third business day after the date of
    such mailing.

              (e) Reproduction of Documents. This Agreement and all documents
relating thereto, including, without limitation, any consents, waivers and
modifications which may hereafter be executed may be reproduced by the Investor
by any







                                      -11-



<PAGE>




photographic, photostatic, microfilm, microcard, miniature photographic or other
similar process and the Investors may destroy any original document so
reproduced. The parties hereto agree and stipulate that any such reproduction
shall be admissible in evidence as the original itself in any judicial or
administrative proceeding (whether or not the original is in existence and
whether or not such reproduction was made by theInvestors in the regular course
of business) and that any enlargement, facsimile or further reproduction of such
reproduction shall likewise be admissible in evidence.

              (f)  Successors and Assigns. This Agreement shall inure to the
benefit of and be binding upon the successors and assigns of each of the
parties.

              (g)  Entire Agreement; Amendment and Waiver. This Agreement
constitutes the entire understanding of the parties hereto and supersedes all
prior understanding among such parties. This Agreement may be amended, and the
observance of any term of this Agreement may be waived, with (and only with) the
written consent of the Company and the Investors holding a majority of the then
outstanding Registrable Securities.

              (h)  Severability. In the event that any part or parts of this
Agreement shall be held illegal or unenforceable by any court or administrative
body of competent jurisdiction, such determination shall not effect the
remaining provisions of this Agreement which shall remain in full force and
effect.

              (i)  Counterparts. This Agreement may be executed in one or more
counterparts, each of which shall be deemed an original and all of which
together shall be considered one and the same agreement.










                                      -12-


<PAGE>





         IN WITNESS WHEREOF, the undersigned have executed this Agreement as of
the date first set forth above.


                                  ENVIROGEN, INC.

                                      /s/ Harcharan S. Gill
                                  By:_________________________________
                                     Harcharan S. Gill
                                     President


                                  INVESTORS:

                                  WARBURG, PINCUS VENTURES, L.P.

                                  By:  Warburg, Pincus & Co.,
                                       General Partner

                                     /s/ Robert S. Hillas
                                  By:_________________________________
                                     Robert S. Hillas
                                     Partner


                                  /s/ William C. Smith
                                  ____________________________________
                                  WILLIAM C. SMITH


                                  /s/ Douglas W. Jacobson
                                  ____________________________________
                                  DOUGLAS W. JACOBSON


                                  /s/ Gary W. Hawk
                                  ____________________________________
                                  GARY W. HAWK

                                  /s/ Richard W. Schowengerdt
                                  ____________________________________
                                  RICHARD W. SCHOWENGERDT







                                      -13-


<PAGE>



                                   SCHEDULE I


Name and Address
of Investor
- -----------

Warburg, Pincus Ventures, L.P.
466 Lexington Avenue
New York, NY  10017
Attention: Robert S. Hillas

William C. Smith
S38 W33688 Highway D
Dousman, WI 53118

Douglas W. Jacobson
2518 N. 81st Street
Wauwatosa, WI 53213

Gary W. Hawk
W272 N1347 Spring Hill Drive
Pewaukee, WI 53072

Richard W. Schowengerdt
250 N. Summit Moors Drive
Oconomowoc, WI 53066





<PAGE>



                             JOINT FILING AGREEMENT


         This Joint Filing  Agreement  dated as of April 18, 1997 among Warburg,
Pincus Ventures, L.P., a Delaware limited partnership;  Warburg, Pincus & Co., a
New York general  partnership;  and E.M. Warburg,  Pincus & Co., LLC, a New York
limited liability company (collectively, the "Reporting Entities").

                               W I T N E S S E T H
                               - - - - - - - - - -


         WHEREAS,  the  Reporting  Entities may be required to file a statement,
and  amendments  thereto,  containing the  information  required by Schedule 13D
pursuant to Section 13(d) of the Securities  Exchange Act of 1934 (the "Exchange
Act"), and Rule 13d-1 promulgated thereunder, in connection with the acquisition
of shares of common stock of Envirogen, Inc., a Delaware corporation; and

         WHEREAS,  pursuant  to  Paragraph  (f) of Rule 13d-1,  the  undersigned
desire to  satisfy  any  Schedule  13D filing  obligation  under Rule 13d-1 by a
single joint filing.

         NOW, THEREFORE, in consideration of the premises, the undersigned
 hereto agree as follows:

         1. The  undersigned  agree that any  Statement on Schedule 13D to which
this Agreement is attached,  and any Amendments to such Statement,  are filed on
behalf of each one of them.

         2. This Agreement may be executed in any number of counterparts and all
of such  counterparts  taken  together shall be deemed to constitute one and the
same instrument.





<PAGE>



         IN WITNESS  WHEREOF,  the undersigned  have caused this Agreement to be
duly executed and delivered on the date above indicated.


                              WARBURG, PINCUS VENTURES, L.P.

                              By:  Warburg, Pincus & Co.,
                                   General Partner



                              By:/s/ Robert S. Hillas
                                 ---------------------------
                                 Robert S. Hillas
                                 Partner


                              WARBURG, PINCUS & CO.



                              By:/s/ Robert S. Hillas
                                 ---------------------------
                                 Robert S. Hillas
                                 Partner


                              E.M. WARBURG, PINCUS & CO., LLC



                              By:/s/ Robert S. Hillas
                                 ---------------------------
                                 Robert S. Hillas
                                 Member



                                        2


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