WITTER DEAN TAX EXEMPT SECURITIES TRUST
N-30D, 1994-08-24
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<PAGE>

                   DEAN WITTER TAX-EXEMPT SECURITIES TRUST

                            Two World Trade Center
                           New York, New York 10048

DEAR SHAREHOLDER:
- -----------------------------------------------------------------------------

   Strong economic growth and a shift in Federal Reserve Board monetary
policy during the first half of 1994 resulted in the sharpest increase in
interest rates in more than six years. At the beginning of the year, most
economic indicators were pointing toward a vigorous recovery. Concerns over
potential inflationary pressure developed as the job market approached full
employment and commodity prices remained volatile. The Federal Reserve Board
responded by tightening monetary policy. Between February and May, the
central bank raised the federal-funds rate --the interest rate banks charge
each other for overnight loans --from 3.00 percent to 4.25 percent in four
separate moves. In May, the discount rate --the interest rate the Federal
Reserve charges member banks for loans --was increased by 50 basis points to
3.50 percent.

   Long-term municipal bond yields, as measured by The Bond Buyer Revenue
Bond Index,* were little changed between October and January. However, in
February and March the Index yield rose 89 basis points from 5.50 percent to
6.39 percent. During April, May and June the municipal market began to show
signs of stability, despite 15 to 20 basis point yield changes each month. At
the end of June the Index yielded 6.56 percent.

   The municipal market is also influenced by unique supply and demand
conditions. New-issue underwriting totaled a record $290 billion in 1993. The
pace of new-issue activity over the first half of 1994, however, slowed 40
percent to a projected annual rate of $180 billion. By way of comparison,
bond maturities and calls for redemptions will reduce municipal debt
outstanding by approximately $190 billion. This imbalance helped municipal
securities outperform their U.S. Treasury counterparts during the second
quarter.

PERFORMANCE

   For the six-month period ended June 30, 1994, Dean Witter Tax-Exempt
Securities Trust paid shareholders tax-free income dividends totaling $0.35
per share and capital gains distributions totaling $0.026 per share. The
Fund's total return for this period was -4.92 percent and is a result of the
portfolio's decline in value. On June 30, 1994 the Fund's per share net asset
value was $11.43. Since inception (March 27, 1980) the Fund has provided
shareholders with an attractive average annual total return of 10 percent. On
June 30, 1994, the Fund had net assets in excess of $1.4 billion.

PORTFOLIO STRUCTURE

   The net short-term investment position at the end of June was 4.3 percent.
Refunded bonds with escrows set to be called within 10 years comprised
another 18 percent of the portfolio. Long-term investments were diversified
among 13 specific municipal sectors and 126 credits. The three largest
sectors in the portfolio were transportation facilities, electric and
hospital revenue bonds, comprising 39 percent of net assets. New York,
California, Massachusetts, Florida and Texas are the five largest states of
issuance among the 35 states represented in the portfolio. The average
maturity and call protection of the Fund's long-term holdings were 18 years
and 7 years, respectively. Bonds subject to the alternative minimum tax (AMT)
comprised approximately 12 percent of net assets. The credit quality ratings
of the long-term portfolio are summarized below:

<TABLE>
<CAPTION>
<S>                                     <C>
 Moody's or Standard & Poor's Rating    Percent
- --------------------------------------  -----------
Aaa or AAA ............................ 29
Aa or AA .............................. 27
A or A ................................ 32
Baa or BBB ............................ 7
Not rated ............................. 5
</TABLE>

<PAGE>

         

LOOKING AHEAD

   A continuation of low new-issue supply coupled with significant bond calls
and maturities should help support municipal bond values, as well as sustain
investor demand for municipal securities. However, the overall direction of
interest rates will primarily be determined by the strength of the economy,
the trend of inflation and the Federal Reserve Board's response to economic
conditions. The level of interest rates and bond redemption activity are the
key factors expected to influence the Fund's future results.

   We appreciate your support of Dean Witter Tax-Exempt Securities Trust and
look forward to serving your future investment needs.

                                              Very truly yours,

                                          /s/ Charles A. Fiumefreddo

                                              Charles A. Fiumefreddo
                                              Chairman of the Board

- ---------------
* The Bond Buyer Revenue Bond Index is an arithmetic average of the yields of
  25 selected municipal revenue bonds with 30-year maturities. Ratings of
  these bonds range from Aa1 to Baa1, as measured by Moody's and AA+ to A-,
  as measured by Standard & Poor's.


<PAGE>

         
<PAGE>

DEAN WITTER TAX-EXEMPT SECURITIES TRUST
PORTFOLIO OF INVESTMENTS June 30, 1994 (unaudited)
- -----------------------------------------------------------------------------

<TABLE>
<CAPTION>
  PRINCIPAL
 AMOUNT (IN                                                                             COUPON    MATURITY
 THOUSANDS)                                                                              RATE       DATE         VALUE
- ------------                                                                          --------- ---------- ---------------
<S>          <C>                                                                        <C>     <C>        <C>
             MUNICIPAL BONDS (94.6%)
             GENERAL OBLIGATION (6.2%)
$10,000      Birmingham, Alabama, Cap Impr & Refg Ser 1985 (Crossover Refunded)  .....   9.80 %  10/ 1/10  $10,893,400
             North Slope Borough, Alaska,
  3,500       Refg 1990 Ser I (MBIA Insured) .........................................   0.00     6/30/99    2,665,740
  3,900       Ser 1992 A (MBIA Insured) ..............................................   0.00     6/30/03    2,310,945
  5,000       Ser 1992 A Conv (MBIA Insured) .........................................   5.90     6/30/03    5,082,450
  4,000      Connecticut, College Savings 1989 Ser A .................................   0.00     7/ 1/08    1,722,080
  5,000      Florida Board of Education, Cap Outlay, Ser 1989 A Refg .................   5.00     6/ 1/24    4,066,400
             Massachusetts,
 20,000       Fiscal Recovery 1990 Ser A .............................................   7.25     6/ 1/96   21,086,000
  1,500       Refg 1992 Ser B ........................................................   6.50     8/ 1/08    1,563,270
 11,500       Refg 1993 Ser A ........................................................   5.50     2/ 1/11   10,549,870
  4,000      Clark County, Nevada, Transportation Ser 1992 A (AMBAC Insured)  ........   6.50     6/ 1/17    4,105,880
             New York City, New York,
 12,000       1990 Ser D .............................................................   6.00     8/ 1/07   11,640,000
 10,000       1990 Ser D .............................................................   6.00     8/ 1/08    9,676,600
  5,165      Roanoke, Virginia, Pub Impr dtd 1/1/94 ..................................   5.25     8/ 1/24    4,461,734
- -------                                                                                                   ------------
 95,565                                                                                                     89,824,369
- -------                                                                                                   ------------
             EDUCATIONAL FACILITIES REVENUE (5.9%)
 10,000      FSU Financial Assistance Inc, Florida, Impr & Refg Ser 1994  ............   5.25    10/ 1/15    8,528,700
 10,000      Maryland Health & Higher Educational Facilities Authority,
              The Johns Hopkins University Ser 1985 (Prerefunded) ....................   9.25     7/ 1/15   10,720,700
    850      University of Maryland, 1989 Refg Ser A .................................   7.20    10/ 1/09      922,547
  7,000      Massachusetts Health & Educational Facilities Authority,
              Boston University Linked RIBS & SAVRS ..................................   6.66    10/ 1/31    7,222,950
 20,000      New Hampshire Higher Educational & Health Facilities Authority,
              Dartmouth College Ser 1993 .............................................   5.375    6/ 1/23   17,290,200
  2,000      New Jersey Economic Development Authority, The Seeing Eye Inc 1991 .....   7.30     4/ 1/11    2,063,500
 11,000      New York State, City University--John Jay College COPs ..................   7.25     8/15/07   11,592,020
             New York State Dormitory Authority, State University
  5,000       Ser 1989 B .............................................................   0.00     5/15/02    3,086,550
 21,000       Ser 1990 B .............................................................   7.00     5/15/16   21,939,120
  2,000      Pennsylvania Higher Educational Facilities Authority, University of
              Pennsylvania Ser 1987 ..................................................   6.625    1/ 1/17    2,012,080
- -------                                                                                                   ------------
 88,850                                                                                                     85,378,367
- -------                                                                                                   ------------
             ELECTRIC REVENUE (13.1%)
             Southern California Public Power Authority, Mead --Adelanto
 20,000       1994 Ser A Linked Inverse Floaters & ACES  (AMBAC Insured)  ............   5.01     7/ 1/15   17,135,000
  5,000       1994 Ser A (AMBAC Insured) .............................................   4.875    7/ 1/20    4,002,700
             Municipal Electric Authority of Georgia,
 10,000       Power Ser K (Prerefunded) ..............................................   6.50     1/ 1/07   10,150,100
 10,000       Fifth Crossover Ser ....................................................   6.50     1/ 1/17   10,202,400
             Nebraska Public Power District, Power
  7,000       Ser 1993 ...............................................................   6.125    1/ 1/15    6,774,040
 25,000       1993 Ser C .............................................................   5.00     1/ 1/17   20,855,750
 15,000      New York State Power Authority, Gen Purpose Ser CC ......................   5.25     1/ 1/18   12,852,900
  5,000      North Carolina Municipal Power Agency #1, Catawba Ser 1988  .............   6.00     1/ 1/15    4,773,300
             Puerto Rico Electric Power Authority, Power
  6,000       Ser N ..................................................................   5.00     7/ 1/12    5,104,020
 20,000       Ser O ..................................................................   0.00     7/ 1/17    4,540,400
  6,000      Austin, Texas, Combined Utilities Refg Ser 1993 A .......................   5.75    11/15/13    5,513,820


<PAGE>

         
<PAGE>
<CAPTION>
DEAN WITTER TAX-EXEMPT SECURITIES TRUST
PORTFOLIO OF INVESTMENTS June 30, 1994 (unaudited) (continued)
- -----------------------------------------------------------------------------------------------------------------

  PRINCIPAL
 AMOUNT (IN                                                                             COUPON    MATURITY
 THOUSANDS)                                                                              RATE       DATE         VALUE
- ------------                                                                          --------- ---------- ---------------
<S>          <C>                                                                        <C>     <C>        <C>
             Intermountain Power Agency, Utah,
$ 25,000      Refg 1985 Ser H GAINS (Prerefunded) ....................................   0.00 %  7/ 1/12   $ 20,251,750
  15,000      Refg 1985 Ser H ........................................................   6.00    7/ 1/21     13,979,250
   5,000      Refg 1985 Ser I ........................................................   6.00    7/ 1/21      4,659,750
   8,000      Refg 1993 Ser A ........................................................   5.00    7/ 1/23      6,469,040
   8,000     Lewis County Public Utility District #1, Washington, Cowlitz Falls Hydro
              Refg Ser 1993 ..........................................................   5.50    1/ 1/13      7,257,840
  10,000     Snohomish County Public Utilities District #1, Washington, 1993 Ser
              (FGIC Insured) .........................................................   6.00    1/ 1/18      9,333,500
  16,000     Washington Public Power Supply System, Proj #2 Refg Ser 1994 A  .........   6.00    7/ 1/07     15,744,960
   9,900     Wisconsin Public Power Inc, Refg Ser 1993 A (AMBAC Insured)  ............   5.25    7/ 1/21      8,378,568
- --------                                                                                                   ------------
 225,900                                                                                                    187,979,088
- --------                                                                                                   ------------
             HOSPITAL REVENUE (12.1%)
   3,000     Baxter County, Arkansas, Baxter County Regional Hospital Inc Impr & Refg
              Ser 1992 ...............................................................   7.50    9/ 1/21      3,107,400
  12,500     California Health Facilities Financing Authority, Kaiser Permanente Ser
              1985 ...................................................................   5.55    8/15/25     10,759,000
  10,000     University of California, UCLA Medical Center Ser 1986 (Prerefunded)        6.90   12/ 1/16     10,721,000
   6,000     Connecticut Health & Educational Facilities Authority, Yale --New Haven
              Hospital Ser F (MBIA Insured) ..........................................   7.10    7/ 1/25      6,459,960
  10,000     Alachua County Health Facilities Authority, Florida, Shands Hospital at
              the University of Florida Ser 1985 (Prerefunded) .......................   8.00   12/ 1/15     10,397,300
   8,350     Altamonte Springs Health Facilities Authority, Florida, Adventist Health/
              Sunbelt Inc Ser 1984 (MBIA Insured) (Prerefunded).......................   7.90   10/ 1/14      9,036,871
   3,500     Maine Health & Higher Educational Facilities Authority, Maine Medical
              Center Ser 1986 (Prerefunded) ..........................................   7.375  10/ 1/13      3,770,760
             Massachusetts Health & Educational Facilities Authority,
   8,000      Brigham & Women's Hospital Ser B (Prerefunded) .........................   7.125   7/ 1/07      8,417,440
   1,500      Malden Hospital --FHA Insured Mtge Ser A ...............................   5.00    8/ 1/16      1,234,980
  15,000      New England Medical Center Ser G (MBIA Insured) ........................   5.375   7/ 1/24     12,942,750
   2,570     New Ulm, Minnesota, Health Central Refg 1985 Ser C (Prerefunded)  .......  10.00   10/ 1/14      2,825,921
             Rochester, Minnesota, Mayo Foundation/Mayo Medical Center
   7,000      Ser 1992 I .............................................................   5.75   11/15/21      6,423,480
   3,700      Ser 1992 F .............................................................   6.25   11/15/21      3,670,844
  18,000     Missouri Health & Educational Facilities Authority, Barnes-Jewish Inc/
              Christian Health Services Ser 1993 A ...................................   5.25    5/15/14     15,507,720
   6,000     New York State Medical Care Facilities Finance Agency,
              Presbyterian Hospital --FHA Insured Mtge 1994 Ser A Refg  ..............   5.25    8/15/14      5,224,800
  12,000     Charlotte-Mecklenburg County Hospital Authority, North Carolina,
              Ser 1992 ...............................................................   6.00    1/ 1/22     11,352,960
   4,000     Cuyahoga County, Ohio, The Cleveland Clinic Foundation Refg Ser 1988 A  .   8.00   12/ 1/15      4,373,120
   6,250     Philadelphia Hospital & Higher Education Facilities Authority,
              Pennsylvania, Temple University Hospital 1993 Ser A ....................   6.625  11/15/23      5,848,625
   9,000     North Central Texas Health Facilities Development Corporation,
              University Medical Center Inc Ser 1987 .................................   7.75    4/ 1/17      9,227,340
   5,000     Salt Lake City, Utah, IHC Hospital Inc Ser of 1983 (ETM) ................   5.00    6/ 1/15      4,341,300
             Fairfax County Industrial Development Authority, Virginia,
  14,000      Fairfax Hospital System Inc/Inova Health Ser 1991 C RITES
               (Prerefunded) .........................................................  10.527+  8/29/23     16,835,000
   7,500      Inova Health System Foundation Refg Ser 1993 A .........................   5.25    8/15/19      6,313,650
   5,000     University of Virginia, Refg Ser E ......................................   6.00    6/ 1/13      4,755,750
- --------                                                                                                   ------------
 177,870                                                                                                    173,547,971
- --------                                                                                                   ------------

<PAGE>

         
<PAGE>
<CAPTION>
DEAN WITTER TAX-EXEMPT SECURITIES TRUST
PORTFOLIO OF INVESTMENTS June 30, 1994 (unaudited) (continued)
- -----------------------------------------------------------------------------------------------------------------

  PRINCIPAL
 AMOUNT (IN                                                                             COUPON    MATURITY
 THOUSANDS)                                                                              RATE       DATE         VALUE
- ------------                                                                          --------- ---------- ---------------
<S>          <C>                                                                        <C>     <C>        <C>
             INDUSTRIAL DEVELOPMENT/POLLUTION CONTROL REVENUE (8.8%)
$ 15,000     Jefferson County, Kentucky, Louisville Gas & Electric Co 1993 Ser B  ....   5.625%   8/15/19  $ 13,712,100
   4,000     Maryland Industrial Development Financing Authority, Medical Waste
              Assocs LP 1989 Ser (AMT)(a) ............................................   8.75    11/15/10     1,200,000
   7,000     Becker, Minnesota, Northern States Power Co Ser A 1989 ..................   6.80     4/ 1/07     7,270,830
  18,000     Claiborne County, Mississippi, Middle South Energy Inc Ser C  ...........   9.875   12/ 1/14    20,721,420
  10,500     Clark County, Nevada, Nevada Power Co Ser 1992 A (AMT) (FGIC Insured)  ..   6.70     6/ 1/22    10,720,185
  10,000     Washoe County, Nevada, Sierra Pacific Power Co Ser 1987 (AMBAC Insured)     6.30    12/ 1/14     9,931,100
   3,000     Pennsylvania Industrial Development Authority, Ser A 1991 (Prerefunded)     7.00     1/ 1/11     3,336,720
   8,000     Alliance Airport Authority, Texas, AMR Corp Ser 1990 (AMT)  .............   7.50    12/ 1/29     7,862,800
   6,000     Brazos River Authority, Texas, Texas Utilities Electric Co
              Collateralized Ser 1988 A (AMT) ........................................   9.25     3/ 1/18     6,720,960
  12,000     Grapevine Industrial Development Corporation, Texas, American Airlines
              Inc Ser 1985 ...........................................................   9.25    12/ 1/12    12,796,920
             Matagorda County Navigational District #1, Texas, Central Power & Light
              Co
   7,000      Collateralized Ser 1984 A ..............................................   7.50    12/15/14     7,506,940
  10,000      Ser 1986 (AMT) .........................................................   7.875   12/ 1/16    10,748,300
   4,000     Putnam County, West Virginia, Appalachian Power Co Ser C ................   6.60     7/ 1/19     3,918,480
  10,000     Weston, Wisconsin, Wisconsin Public Service Corp Refg Ser 1993 A  .......   6.90     2/ 1/13    10,605,900
- --------                                                                                                   ------------
 124,500                                                                                                    127,052,655
- --------                                                                                                   ------------
             MORTGAGE REVENUE --MULTI-FAMILY (1.8%)
             Massachusetts Housing Finance Agency,
   4,875      GNMA-Backed Ser 1985 A .................................................   9.125   12/ 1/20     5,151,461
   4,800      Hsg Dev 1986 Ser A (AMT) ...............................................   7.75    12/ 1/19     4,952,736
   7,000     Michigan Housing Development Authority, Rental Ser A (Bifurcated FSA
              Insured) ...............................................................   6.50     4/ 1/23     6,900,460
             New York City Housing Development Corporation, New York,
   4,682      Ruppert Proj--FHA Insured Sec 223F .....................................   6.50    11/15/18     4,467,677
   4,544      Stevenson Commons Proj --FHA Insured Sec 223F ..........................   6.50     5/15/18     4,336,620
- --------                                                                                                   ------------
  25,901                                                                                                     25,808,954
- --------                                                                                                   ------------
             MORTGAGE REVENUE --SINGLE FAMILY (5.3%)
   4,065     California Housing Finance Agency, Home Cap Apprec 1983 Ser B  ..........   0.00     8/ 1/15       454,182
  13,100     Illinois Housing Development Authority, Residential Ser C-1 & C-2 Linked
              RIBS & SAVRS (AMT) .....................................................   6.733    2/ 1/18    13,091,616
   9,600     Nebraska Investment Finance Authority, GNMA-Backed 1990 Ser 1 & 2 Linked
              RIBS & SAVRS ...........................................................   7.631    9/10/30     9,995,424
   4,010     North Carolina Housing Finance Agency, Ser Q (AMT) ......................   8.00     3/ 1/18     4,095,854
   7,700     Ohio Housing Finance Agency, GNMA-Backed 1990 Ser A-1 & 2 Linked RIBS &
              SAVRS (AMT) ............................................................   6.903    3/ 1/31     7,710,934
             Pennsylvania Housing Finance Agency,
   8,000      Ser 1993-37A ...........................................................   5.45    10/ 1/17     6,904,560
  10,000      Ser 1991-31 B & C Linked RIBS & SAVRS (AMT) ............................   7.00    10/ 1/23    10,113,500
             Tennessee Housing Development Agency, Mortgage Finance
   4,000      1993 Ser A  .............................................................  5.90     7/ 1/18     3,674,000
  12,700      1993 Ser A  .............................................................  5.95     7/ 1/28    11,476,101
   9,200     Wisconsin Housing & Economic Development Authority, Home Ownership 1991
              Ser 2 & 3 Linked RIBS & SAVRS (AMT) ....................................   6.955   10/ 1/22     9,352,260
- --------                                                                                                   ------------
  82,375                                                                                                     76,868,431
- --------                                                                                                   ------------
             NURSING & HEALTH RELATED FACILITIES REVENUE (0.2%)
   4,000     Maine Health & Higher Educational Facilities Authority, Ser 1992 B (FSA
              Insured) ...............................................................   5.50     7/ 1/22     3,459,680
- --------                                                                                                   ------------


<PAGE>

         
<PAGE>
<CAPTION>
DEAN WITTER TAX-EXEMPT SECURITIES TRUST
PORTFOLIO OF INVESTMENTS June 30, 1994 (unaudited) (continued)
- -----------------------------------------------------------------------------------------------------------------

  PRINCIPAL
 AMOUNT (IN                                                                             COUPON    MATURITY
 THOUSANDS)                                                                              RATE       DATE         VALUE
- ------------                                                                          --------- ---------- ---------------
<S>          <C>                                                                        <C>     <C>        <C>
             PUBLIC FACILITIES REVENUE (6.5%)
             Los Angeles Convention & Exhibition Center Authority, California,
$ 9,000       Ser 1985 (Prerefunded) .................................................   5.375%    8/15/18  $10,865,875
 12,500       1993 Refg Ser A (MBIA Insured) .........................................   9.00     12/ 1/20   11,546,460
  7,000      Palm Beach County, Florida, Criminal Justice Ser 1990 (FGIC Insured)  ...   6.00      6/ 1/13    6,829,550
 10,000      Metropolitan Pier & Exposition Authority, Illinois, McCormick Place Ser
              1992 A .................................................................   6.50      6/15/27    9,813,200
  3,000      Maine Municipal Bond Bank, 1988 Ser B (Prerefunded) .....................   7.85     11/ 1/18    3,400,680
 10,000      Michigan Building Authority, 1993 Refg Ser I (AMBAC Insured)  ...........   5.30     10/ 1/16    8,778,300
  6,000      Saint Louis Industrial Development Authority, Missouri, Kiel Center Refg
              Ser 1992 (AMT) .........................................................   7.75     12/ 1/13    6,172,020
 14,000      New York State Dormitory Authority, Suffolk County Judicial Ser 1986
              (ETM) ..................................................................   7.375     7/ 1/16   16,183,300
             Ohio Building Authority, Correctional
  5,000       1985 Ser C BIGS ........................................................   0.00     10/ 1/05    5,476,300
 10,000       1986 Ser A (Prerefunded) ...............................................   7.35      8/ 1/06   11,165,300
  2,000       Refg 1986 Ser B ........................................................   7.12      9/ 1/09    2,107,260
- -------                                                                                                    ------------
 88,500                                                                                                      92,338,245
- -------                                                                                                    ------------
             RESOURCE RECOVERY REVENUE (6.5%)
             Connecticut Resources Recovery Authority,
  9,000       American REF-FUEL Co of Southeastern Connecticut 1988 Ser A (AMT) ......   8.00     11/15/15    9,843,570
  4,950       Bridgeport RESCO Ser A .................................................   7.625     1/ 1/09    5,261,207
  7,060      Broward County, Florida, SES Broward County South Ser 1984  .............   7.95     12/ 1/08    7,606,443
  8,500      Savannah Resource Recovery Development Authority, Georgia, Savannah
              Energy Systems Co Ser 1992 .............................................   6.30     12/ 1/06    8,601,575
 13,050      Northeast Maryland Waste Disposal Authority, Montgomery County
              Ser 1993 A (AMT) .......................................................   6.30      7/ 1/16   12,367,485
  3,000      Greater Detroit Resource Recovery Authority, Michigan, Ser C  ...........   9.25     12/13/08    3,202,650
  9,000      Mercer County Improvement Authority, New Jersey, Refg Ser A 1992 (AMT)
              (FGIC Insured) .........................................................   6.70      4/ 1/13    9,364,500
  9,000      Union County Utilities Authority, New Jersey, 1991 Ser A (AMT)  .........   7.20      6/15/14    9,263,430
 10,000      Hempstead Industrial Development Agency, New York, 1985 American
              REF-FUEL Co of Hempstead ...............................................   7.40     12/ 1/10   10,403,100
  7,030      New York State Environmental Facilities Corporation, Huntington
              1989 Ser A (AMT) .......................................................   7.50     10/ 1/12    7,131,584
  5,000      Onondaga County Resource Recovery Agency, New York, 1992 Ser
              (AMT) ..................................................................   6.875     5/ 1/06    5,054,450
  5,000      Fairfax County Economic Development Authority, Virginia, Ogden Martin
              Systems of Fairfax Inc Ser 1988 A (AMT) ................................   7.75      2/ 1/11    5,437,100
- -------                                                                                                    ------------
 90,590                                                                                                      93,537,094
- -------                                                                                                    ------------
             TRANSPORTATION FACILITIES REVENUE (13.4%)
 10,000      San Francisco Bay Area Rapid Transit District, California, Sales Tax Ser
              1985 (Prerefunded) .....................................................   9.00      7/ 1/11   10,795,700
             Mid-Bay Bridge Authority, Florida,
  8,965       Sr Lien Crossover Refg Ser 1993 A ......................................   6.00     10/ 1/13    8,666,376
  2,500       Jr Lien Advance Refg Ser 1993 D ........................................   6.125    10/ 1/22    2,318,450
  2,500       Ser 1991 A (Crossover Refunded) ........................................   6.875    10/ 1/22    2,748,300
 10,000      Atlanta, Georgia, Airport Ser 1990 (AMT) ................................   6.25      1/ 1/21    9,649,200
  8,100      Metropolitan Atlanta Rapid Transit Authority, Georgia, Sales Tax Refg
              Ser K ..................................................................   7.25      7/ 1/10    8,703,207
  5,000      Hawaii, Airports Second Ser 1991 (AMT) ..................................   7.00      7/ 1/18    5,147,750
  5,000      Chicago, Illinois, Chicago --O'Hare Intl Airport Refg 1993 Ser A  .......   5.00      1/ 1/16    4,137,650
             Kentucky Turnpike Authority,
  5,135       Economic Development Road Revitalization Ser 1990 (Prerefunded))........   7.25      5/15/10    5,726,860
 30,000       Resource Recovery Road Refg 1987 Ser A .................................   5.00      7/ 1/08   26,948,400
- -------                                                                                                    ------------


<PAGE>

         
<PAGE>
<CAPTION>
DEAN WITTER TAX-EXEMPT SECURITIES TRUST
PORTFOLIO OF INVESTMENTS June 30, 1994 (unaudited) (continued)
- -----------------------------------------------------------------------------------------------------------------

  PRINCIPAL
 AMOUNT (IN                                                                             COUPON    MATURITY
 THOUSANDS)                                                                              RATE       DATE         VALUE
- ------------                                                                          --------- ---------- ---------------
<S>          <C>                                                                        <C>     <C>        <C>
$  2,255     Massachusetts Port Authority, Refg Ser 1985 B ...........................   9.375%   7/ 1/15  $  2,405,859
             New Jersey Highway Authority, Sr Parkway
  11,000      Refg Ser 1992 ..........................................................   6.25     1/ 1/14    11,031,130
  10,000      1986 Ser (Prerefunded) .................................................   7.125    1/ 1/14    10,611,000
     630      1989 Ser ...............................................................   6.00     1/ 1/19       607,314
             Albuquerque, New Mexico, Gross Receipts Tax--Airport Supported
   7,000      Sub Lien Ser 12/84 .....................................................   8.25     7/ 1/14     7,441,770
   7,000      Sub Lien Ser 12/84 .....................................................   8.25     7/ 1/14     7,452,480
  10,000     Port Authority of New York & New Jersey, Cons 53rd Ser** ................   8.70     7/15/20    10,695,300
   7,000     Ohio Turnpike Commission, 1994 Ser A ....................................   5.75     2/15/24     6,346,970
             Pennsylvania Turnpike Commission,
   5,000      Ser L of 1991 (MBIA Insured) ...........................................   6.00     6/ 1/15     4,820,950
  15,000      Ser A of 1986 ..........................................................   6.00    12/ 1/17    14,034,750
   6,000      Ser K of 1989 (Prerefunded) ............................................   7.50    12/ 1/19     6,783,660
  15,000     Puerto Rico Highway & Transportation Authority, Refg Ser X  .............   5.50     7/ 1/15    13,580,550
   4,000     Virginia Transportation Board, US Route 58 Corridor Ser 1993 B  .........   5.625    5/15/13     3,687,440
   9,000     Port of Seattle, Washington, Ser 1992 B (AMT) ...........................   6.00    11/ 1/17     8,421,300
- --------                                                                                                   ------------
 196,085                                                                                                    192,762,366
- --------                                                                                                   ------------
             WATER & SEWER REVENUE (11.9%)
  10,000     Birmingham Water Works & Sewer Board, Alabama, Ser 1994 .................   5.50     1/ 1/20     8,904,400
             Phoenix Civic Improvement Corporation, Arizona,
  10,000      Jr Lien Water Ser 1994 .................................................   5.45     7/ 1/19     8,811,500
   3,000      Wastewater Refg Ser 1993 ...............................................   4.75     7/ 1/23     2,268,300
  10,000     California Department of Water Resources, Central Valley Refg Ser L  ....   5.50    12/ 1/23     8,730,400
   5,000     Central Coast Water Authority, California, Ser 1992 (AMBAC Insured)  ....   6.60    10/ 1/22     5,100,050
  19,750     East Bay Municipal Utility District, California, Water Refg Ser 1993
              (MBIA Insured) .........................................................   5.00     6/ 1/21    16,069,587
   7,500     South Central Connecticut Regional Water Authority, 1986 Ser
              (Prerefunded) ..........................................................   7.125    8/ 1/12     8,038,125
  10,000     Atlanta, Georgia, Water & Sewer Ser 1985 (Prerefunded) ..................   9.50     1/ 1/08    10,492,900
   4,750     Baltimore, Maryland, Water Refg Ser 1990-A (MBIA Insured)
              (Prerefunded) ..........................................................   6.50     7/ 1/20     5,085,065
             Boston Water & Sewer Commission, Massachusetts,
   6,000      Ser A 1984 (Prerefunded) ...............................................   7.00     1/ 1/11     6,222,180
   2,315      Ser A 1986 .............................................................   7.875   11/ 1/13     2,512,794
   1,440      Ser A 1986 (Prerefunded) ...............................................   7.875   11/ 1/13     1,572,782
             Massachusetts Water Resources Authority,
  10,000      Refg 1992 Ser B ........................................................   5.50    11/ 1/15     8,801,100
  14,250      1993 Ser C .............................................................   5.25    12/ 1/15    12,308,153
   4,000     Detroit, Michigan, Sewage Refg Ser 1993-A (FGIC Insured) ................   5.70     7/ 1/13     3,753,040
   8,500     Albuquerque, New Mexico, Joint Water & Sewer 1986 Ser A .................   6.00     7/ 1/15     8,868,985
             New York City Municipal Water Finance Authority, New York,
   8,500      1994 Ser B .............................................................   5.30     6/15/06     8,186,435
   3,700      1991 Ser C (Prerefunded) ...............................................   7.375    6/15/13     4,203,681
  10,000      1993 Ser A .............................................................   6.00     6/15/17     9,498,600
  10,000     Philadelphia, Pennsylvania, Water & Wastewater Ser 1993
              (Capital Guaranty Insured) .............................................   5.50     6/15/15     8,968,800
  10,000     Fairfax County, Virginia, Sewer Ser A (AMBAC Insured) (Prerefunded)).....   7.00    11/15/16    11,055,100
  10,000     Richmond, Virginia, Public Utilities Ser A (Prerefunded) ................   8.00     1/15/18    11,161,400
- --------                                                                                                   ------------
 178,705                                                                                                    170,613,377
- --------                                                                                                   ------------
             OTHER REVENUE (2.9%)
   3,500     Denver, Colorado, Excise Tax Ser 1985 A .................................   5.00    11/ 1/08     3,141,425
             New York Local Government Assistance Corporation,
   9,000      Ser 1994 A .............................................................   5.375    4/ 1/14     7,954,560
  11,000      Ser 1993 C Refg ........................................................   5.50     4/ 1/17     9,796,710
   8,000      Ser 1991 D (Prerefunded) ...............................................   7.00     4/ 1/18     8,961,440
- --------                                                                                                   ------------


<PAGE>

         
<PAGE>
<CAPTION>
DEAN WITTER TAX-EXEMPT SECURITIES TRUST
PORTFOLIO OF INVESTMENTS June 30, 1994 (unaudited) (continued)
- -----------------------------------------------------------------------------------------------------------------

  PRINCIPAL
 AMOUNT (IN                                                                             COUPON    MATURITY
 THOUSANDS)                                                                              RATE       DATE         VALUE
- ------------                                                                          --------- ---------- ---------------
<S>          <C>                                                                        <C>     <C>        <C>
$   11,000   New York State Dormitory Authority, The Metropolitan Museum of Art
              Ser 1987 (Prerefunded) .................................................   7.625%   7/ 1/15  $   11,727,870
- ----------                                                                                                 --------------
    42,500                                                                                                     41,582,005
- ----------                                                                                                 --------------

 1,421,341   TOTAL MUNICIPAL BONDS (IDENTIFIED COST $1,328,494,866) ..................                      1,360,752,602
- ----------                                                                                                 --------------
             SHORT-TERM MUNICIPAL OBLIGATIONS (4.3%)
    12,500   Orange County, California, Irvine Co Apts Issue 1 of 1985 TECP  .........   2.80*    7/21/94      12,500,000
    17,400   Volusia County Health Facilities Authority, Florida, Pooled Hospital
              (FGIC Insured)(Tender 7/6/94) ..........................................   2.85*   11/ 1/15      17,400,000
    17,500   Illinois Health Facilities Authority, Elmhurst Memorial Hospital Ser
              1993 B (Tender 7/1/94) .................................................   3.15*    5/ 1/11      17,500,000
    14,500   Gulf Coast Waste Disposal Authority, Texas, Amoco Oil Co Ser 1992
              (Tender 7/1/94) ........................................................   3.30*   10/ 1/17      14,500,000
- ----------                                                                                                 --------------
    61,900   TOTAL SHORT-TERM MUNICIPAL OBLIGATIONS (IDENTIFIED COST $61,900,000)  ...                         61,900,000
- ----------                                                                                                 --------------
$1,483,241   TOTAL INVESTMENTS (IDENTIFIED COST $1,390,394,866) (B) ..................         98.9%        1,422,652,602
==========
             CASH AND OTHER ASSETS IN EXCESS OF LIABILITIES ..........................          1.1            15,815,960
                                                                                              ------       --------------
             NET ASSETS ..............................................................        100.0%       $1,438,468,562
                                                                                              ======       ==============
<FN>
- ---------------
   ACES --Auction Rate Securities.

   AMT --Alternative Minimum Tax.

   BIGs --Bond Income Growth Security.

   COPs --Certificates of Participation.

   ETM --Escrowed to Maturity.

   GAINS --Growth and Income Securities.

   RIBS --Residual Interest Bonds.

   RITES --Residual Interest Tax Exempt Security.

   SAVRS --Selected Auction Variable Rates Securities.

   TECP --Tax-exempt Commercial Paper.

   + Current coupon rate for residual interest bonds. This rate resets
     periodically as the auction rate on the related short-term securities
     fluctuates.

   * Variable or floating rate securities. Coupon rate shown reflects current
     rate.

  ** Tax-exempt in New York and New Jersey.

 (a) Bond in default.

 (b) The aggregate cost for federal income tax purposes is $1,390,394,866;
     the aggregate gross unrealized appreciation is $82,649,307 and the
     aggregate gross unrealized depreciation is $50,391,571, resulting in
     net unrealized appreciation of $32,257,736.
</TABLE>
                        See Notes to Financial Statements


<PAGE>

         

<TABLE>
<PAGE>

DEAN WITTER TAX-EXEMPT SECURITIES TRUST
PORTFOLIO OF INVESTMENTS June 30, 1994 (unaudited) (continued)
- -----------------------------------------------------------------------------
<CAPTION>
                   GEOGRAPHIC SUMMARY OF INVESTMENTS
            Based on Market Value as a Percent of Net Assets
                        June 30, 1994 (unaudited)

- -----------------------------------------------------------------------------
<S>           <C>     <S>              <C>     <S>              <C>
Alabama ...... 1.4%    Maryland ....... 2.1%    Ohio ........... 2.6%
Alaska ....... 0.7     Massachusetts .. 7.4     Pennsylvania  .. 4.4
Arkansas ..... 0.2     Michigan ....... 1.6     Puerto Rico  ... 1.6
Arizona ...... 0.8     Minnesota ...... 1.4     Tennessee ...... 1.1
California  .. 8.3     Mississippi  ... 1.4     Texas .......... 5.2
Colorado ..... 0.2     Missouri ....... 1.5     Utah ........... 3.5
Connecticut  . 2.2     Nebraska ....... 2.6     Virginia ....... 4.4
Florida ...... 5.4     Nevada ......... 1.7     Washington ..... 2.8
Georgia ...... 4.0     New Hampshire .. 1.2     West Virginia  . 0.3
Hawaii ....... 0.4     New Jersey ..... 3.0     Wisconsin ...... 2.0
Illinois ..... 3.1     New Mexico ..... 1.7     Joint Exemption. 0.7
Kentucky ..... 3.2     New York ...... 12.7                    ------
Maine ........ 0.7     North Carolina.  1.4    Total .......... 98.9%
- -------                                                        ======
</TABLE>

<PAGE>

         

DEAN WITTER TAX-EXEMPT SECURITIES TRUST
FINANCIAL STATEMENTS
- -----------------------------------------------------------------------------

STATEMENT OF ASSETS AND LIABILITIES
June 30, 1994 (unaudited)
- -----------------------------------------------------------------------------

<TABLE>
<CAPTION>
<S>                                         <C>
 ASSETS:
Investments in securities, at value
 (identified cost $1,390,394,866) (Note 1)  $1,422,652,602
Cash ......................................      1,386,987
Receivable for:
 Interest .................................     25,260,611
 Investments sold .........................     20,017,446
 Shares of beneficial interest sold  ......        504,164
Prepaid expenses and other assets  ........         97,035
                                            --------------
   TOTAL ASSETS ...........................  1,469,918,845
                                            --------------
LIABILITIES:
Payable for:
 Investments purchased ....................     30,000,000
 Shares of beneficial interest repurchased         344,668
 Investment management fee (Note 2)  ......        499,280
Dividends to shareholders .................        473,269
Accrued expenses (Note 3) .................        133,066
                                            --------------
   TOTAL LIABILITIES ......................     31,450,283
                                            --------------
NET ASSETS:
Paid-in-capital ...........................  1,400,101,923
Accumulated undistributed net realized
 gain .....................................      6,108,903
Net unrealized appreciation on investments      32,257,736
                                            --------------
   NET ASSETS ............................. $1,438,468,562
                                            ==============
NET ASSET VALUE PER SHARE, 125,840,615
 shares outstanding (unlimited authorized
 shares of $.01 par value) ................         $11.43
                                            ==============
MAXIMUM OFFERING PRICE PER SHARE (net
 asset value plus 4.17% of net asset
 value)* ..................................         $11.91
                                            ==============
</TABLE>
- ---------------
*On sales of $25,000 or more the offering price is
 reduced.

STATEMENT OF OPERATIONS
For the six months ended June 30, 1994 (unaudited)
- -----------------------------------------------------------------------------

<TABLE>
<CAPTION>
<S>                                      <C>
 INVESTMENT INCOME:
 INTEREST INCOME ....................... $   48,353,119
                                         --------------
 EXPENSES
  Investment management fee (Note 2)  ..      3,087,320
  Transfer agent fees and expenses  ....        279,725
  Registration fees ....................         42,699
  Shareholder reports and notices  .....         33,739
  Professional fees ....................         17,542
  Trustees' fees and expenses (Note 3)           13,712
  Other ................................         16,997
                                         --------------
   TOTAL EXPENSES ......................      3,491,734
                                         --------------
    NET INVESTMENT INCOME ..............     44,861,385
                                         --------------
REALIZED AND UNREALIZED GAIN (LOSS)
 ON INVESTMENTS--NET (Note 1):
  Net realized gain on investments  ....      6,142,759
  Net change in unrealized appreciation
   on investments ......................   (128,256,095)
                                         --------------
   NET LOSS ON INVESTMENTS .............   (122,113,336)
                                         --------------
    NET DECREASE IN NET ASSETS
     RESULTING FROM OPERATIONS .........  $ (77,251,951)
                                         ==============
</TABLE>


<PAGE>

         
<PAGE>

STATEMENT OF CHANGES IN NET ASSETS
- -----------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                       FOR THE SIX
                                                                       MONTHS ENDED      FOR THE YEAR
                                                                      JUNE 30, 1994         ENDED
                                                                       (UNAUDITED)    DECEMBER 31, 1993
                                                                    ----------------  -----------------
<S>                                                                 <C>               <C>
INCREASE (DECREASE) IN NET ASSETS:
 Operations:
  Net investment income ........................................... $    44,861,385   $    91,474,661
  Net realized gain on investments ................................       6,142,759         8,324,995
  Net change in unrealized appreciation on investments  ...........    (128,256,095)       54,678,906
                                                                    ---------------   ---------------
   Net increase (decrease) in net assets resulting from operations      (77,251,951)      154,478,562
                                                                    ---------------   ---------------
 Dividends and distributions to shareholders from:
  Net investment income ...........................................     (44,861,385)      (91,474,661)
  Net realized gain on investments ................................      (3,275,754)         (701,643)
                                                                    ---------------   ---------------
   Total dividends and distributions ..............................     (48,137,139)      (92,176,304)
 Net increase (decrease) from transactions in shares of
  beneficial interest (Note 4) ....................................     (18,128,394)      196,214,972
                                                                    ---------------   ---------------
   Total increase (decrease) ......................................    (143,517,484)      258,517,230
NET ASSETS:
 Beginning of period ..............................................   1,581,986,046     1,323,468,816
                                                                    ---------------   ---------------
 END OF PERIOD ....................................................  $1,438,468,562    $1,581,986,046
                                                                    ===============   ===============
</TABLE>

                      See Notes to Financial Statements


<PAGE>

         
<PAGE>

DEAN WITTER TAX-EXEMPT SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS (unaudited)
- -----------------------------------------------------------------------------

1.  ORGANIZATION AND ACCOUNTING POLICIES --Dean Witter Tax-Exempt Securities
Trust (the "Fund") is registered under the Investment Company Act of 1940, as
amended (the "Act"), as a diversified, open-end management investment
company. The Fund was organized as a Massachusetts business trust on April
30, 1987 and commenced operations on March 27, 1980.

     The following is a summary of significant accounting policies:

     A. Valuation of Investments --Portfolio securities are valued for the
     Fund by an outside independent pricing service approved by the Trustees.
     The pricing service has informed the Fund that in valuing the Fund's
     portfolio securities, it uses both a computerized grid matrix of
     tax-exempt securities and evaluations by its staff, in each case based
     on information concerning market transactions and quotations from
     dealers which reflect the bid side of the market each day. The Fund's
     portfolio securities are thus valued by reference to a combination of
     transactions and quotations for the same or other securities believed to
     be comparable in quality, coupon, maturity, type of issue, call
     provisions, trading characteristics and other features deemed to be
     relevant.

     B. Accounting for Investments --Security transactions are accounted for
     on the trade date (date the order to buy or sell is executed). Realized
     gains and losses on security transactions are determined on the
     identified cost method. In computing net investment income, the Fund
     amortizes premiums and original issue discounts. With respect to market
     discount on bonds purchased after April 30, 1993, a portion of any
     capital gain realized upon disposition may be recharacterized as taxable
     investment income. Interest income is accrued daily except where
     collection is not expected.

     C. Federal Income Tax Status --It is the Fund's policy to comply with
     the requirements of the Internal Revenue Code applicable to regulated
     investment companies and to distribute all of its taxable and nontaxable
     income to its shareholders. Accordingly, no federal income tax is
     required.

     D. Dividends and Distributions to Shareholders --The Fund records
     dividends and distributions to its shareholders on the record date. The
     amount of dividends and distributions from net investment income and net
     realized capital gains are determined in accordance with federal income
     tax regulations which may differ from generally accepted accounting
     principles. These "book/tax" differences are either considered temporary
     or permanent in nature. To the extent these differences are permanent in
     nature, such amounts are reclassified within the capital accounts based
     on their federal tax-basis treatment; temporary differences do not
     require reclassification. Dividends and distributions which exceed net
     investment income and net realized capital gains for financial reporting
     purposes but not for tax purposes are reported as dividends in excess of
     net investment income or distributions in excess of net realized capital
     gains. To the extent they exceed net investment income and net realized
     capital gains for tax purposes, they are reported as distributions of
     paid-in-capital.

2. TRANSACTIONS WITH INVESTMENT MANAGER --Pursuant to an Investment
Management Agreement with Dean Witter InterCapital Inc. (the "Investment
Manager"), the Fund pays its Investment Manager a monthly management fee,
calculated and accrued daily, by applying the annual rate of 0.50% to the
portion of daily net assets not exceeding $500 million; 0.425% of the portion
of daily net assets exceeding $500 million but not exceeding $750 million;
0.375% of the portion of daily net assets exceeding $750 million but not
exceeding $1 billion; 0.35% of the portion of daily net assets exceeding $1
billion but not exceeding $1.25 billion; and 0.325% of the portion of daily
net assets exceeding $1.25 billion.


<PAGE>

         
<PAGE>

DEAN WITTER TAX-EXEMPT SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS (unaudited) (continued)
- -----------------------------------------------------------------------------

   Under the terms of the Agreement, in addition to managing the Fund's
investments, the Investment Manager maintains certain of the Fund's books and
records and furnishes, at its own expense, office space, facilities,
equipment, clerical, bookkeeping and certain legal services and pays the
salaries of all personnel, including officers of the Fund who are employees
of the Investment Manager. The Investment Manager also bears the cost of
telephone services, heat, light, power and other utilities provided to the
Fund.

   Shares of the Fund are distributed by Dean Witter Distributors Inc. (the
"Distributor"), an affiliate of the Investment Manager. The Distributor has
informed the Fund that for the six months ended June 30, 1994, it received
approximately $1,841,000 in commissions from the sale of the Fund's shares of
beneficial interest. Such commissions are not an expense of the Fund; they
are deducted from the proceeds of the shares of beneficial interest.

3. SECURITY TRANSACTIONS AND TRANSACTIONS WITH AFFILIATES --The cost of
purchases and proceeds from sales of portfolio securities, excluding
short-term investments, for the six months ended June 30, 1994 aggregated
$198,093,646 and $218,421,555, respectively.

   Dean Witter Trust Company, an affiliate of the Investment Manager and
Distributor, is the Fund's transfer agent. At June 30, 1994, the Fund had
transfer agent fees and expenses payable of approximately $49,000.

   On April 1, 1991, the Fund established an unfunded noncontributory defined
benefit pension plan covering all Trustees of the Fund who will have served
as an independent Trustee for at least five years at the time of retirement.
Benefits under this plan are based on years of service and compensation
during the last five years of service. Aggregate pension costs for the six
months ended June 30, 1994, included in Trustees' fees and expenses in the
Statement of Operations amounted to $4,047. At June 30, 1994, the Fund had an
accrued pension liability of $43,059 which is included in accrued expenses in
the Statement of Assets and Liabilities.

4. SHARES OF BENEFICIAL INTEREST --Transactions in shares of beneficial
interest were as follows:

<TABLE>
<CAPTION>
                                  FOR THE SIX MONTHS ENDED            FOR THE YEAR ENDED
                                       JUNE 30, 1994                  DECEMBER 31, 1993
                               ------------------------------  -------------------------------
                                   SHARES          AMOUNT         SHARES           AMOUNT
                               -------------  ---------------  --------------  ---------------
<S>                            <C>            <C>              <C>             <C>
Sold .........................  5,652,953     $  65,596,678     22,369,075     $ 273,876,016
Reinvestment of dividends and
 distributions ...............  2,113,597        27,228,004      4,269,905        52,363,197
                               ----------     -------------    -----------     -------------
                                7,766,550        92,824,682     26,638,980       326,239,213
Repurchased .................. (9,399,873)     (110,953,076)   (10,610,367)     (130,024,241)
                               ----------     -------------    -----------     -------------
Net increase (decrease)  ..... (1,633,323)    $ (18,128,394)    16,028,613     $ 196,214,972
                               ==========     =============    ===========     =============
</TABLE>


<PAGE>

         
<PAGE>

DEAN WITTER TAX-EXEMPT SECURITIES TRUST
FINANCIAL HIGHLIGHTS
- -----------------------------------------------------------------------------

Selected ratios and per share data for a share of beneficial interest
outstanding throughout each period:

<TABLE>
<CAPTION>

                                          FOR THE SIX
                                          MONTHS ENDED                      FOR THE YEAR ENDED DECEMBER 31,
                                         JUNE 30, 1994   --------------------------------------------------------------------
                                          (UNAUDITED)        1993          1992          1991          1990          1989
                                        ---------------  ------------  ------------  ------------  ------------  ------------
<S>                                       <C>              <C>           <C>           <C>           <C>           <C>
PER SHARE OPERATING PERFORMANCE:
 Net asset value, beginning of period     $12.41           $11.88        $11.65        $11.09        $11.28        $10.96
                                         --------         --------      --------      --------      --------      --------
  Net investment income ...............     0.35             0.77          0.79          0.80          0.80          0.81
  Net realized and unrealized gain
   (loss) on investments ..............    (0.95)            0.54          0.23          0.56         (0.18)         0.32
                                         --------         --------      --------      --------      --------      --------
 Total from investment operations  ....    (0.60)            1.31          1.02          1.36          0.62          1.13
                                         --------         --------      --------      --------      --------      --------
 Less dividends and distributions:
  Dividends from net investment
   income .............................    (0.35)           (0.77)        (0.79)        (0.80)        (0.81)        (0.81)
  Distributions from net realized gain
   on investments .....................    (0.03)           (0.01)         -0-           -0-           -0-           -0-
                                         --------         --------      --------      --------      --------      --------
 Total dividends and distributions  ...    (0.38)           (0.78)        (0.79)        (0.80)        (0.81)        (0.81)
                                         --------         --------      --------      --------      --------      --------
 Net asset value, end of period  ......   $11.43           $12.41        $11.88        $11.65        $11.09        $11.28
                                         ========         ========      ========      ========      ========      ========
TOTAL INVESTMENT RETURN+ ..............    (4.92)%(1)       11.23%         9.09%        12.71%         5.86%        10.61%
RATIOS/SUPPLEMENTAL DATA:
 Net assets, end of period
  (in thousands) ......................    $1,438,469     $1,581,986    $1,323,469    $1,144,716    $1,010,355     $1,033,250
 Ratios of expenses to average
  net assets ..........................     0.47%(2)         0.47%         0.49%         0.51%         0.51%         0.51%
 Ratio of net investment income to
  average net assets ..................     5.98%(2)         6.23%         6.74%         7.05%         7.25%         7.31%
 Portfolio turnover rate ..............    14   %           13   %         4   %        10   %        19   %        13   %
<FN>
- ---------------

   + Does not reflect the deduction of sales load.

 (1) Not annualized.

 (2) Annualized.
</TABLE>
                      See Notes to Financial Statements


<PAGE>

         
<PAGE>
TRUSTEES
- ---------------
Jack F. Bennett
Michael Bozic
Charles A. Fiumefreddo
Edwin J. Garn
John R. Haire
Dr. John E. Jeuck
Dr. Manuel H. Johnson
Paul Kolton
Michael E. Nugent
Philip J. Purcell
John L. Schroeder
Edward R. Telling

OFFICERS
- ---------------
Charles A. Fiumefreddo
Chairman and Chief Executive Officer

Sheldon Curtis
Vice President, Secretary and General Counsel

James F. Willison
Vice President

Thomas F. Caloia
Treasurer

TRANSFER AGENT
- --------------
Dean Witter Trust Company
Harborside Financial Center --Plaza Two
Jersey City, New Jersey 07311

LEGAL COUNSEL
- -------------
Sheldon Curtis
Two World Trade Center
New York, New York 10048

INDEPENDENT  ACCOUNTANTS
- ------------------------
Price Waterhouse LLP
1177 Avenue of the Americas
New York, New York 10036

INVESTMENT MANAGER
- ------------------
Dean Witter InterCapital Inc.
Two World Trade Center
New York, New York 10048

The financial statements included herein have been taken from the records of
the Fund without examination by the independent accountants and accordingly
they do not express an opinion thereon.

This report is submitted for the general information of shareholders of the
Fund. For more detailed information about the Fund, its officers and
trustees, fees, expenses and other pertinent information, please see the
prospectus of the Fund.

This report is not authorized for distribution to prospective investors in
the Fund unless preceded or accompanied by an effective prospectus.

DEAN WITTER
TAX-EXEMPT
SECURITIES
TRUST

SEMIANNUAL REPORT
JUNE 30, 1994


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