PUTNAM CALIFORNIA TAX EXEMPT MONEY MARKET FUND
N-30D, 1996-12-02
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Putnam
California
Tax Exempt
Money Market
Fund

ANNUAL REPORT
September 30, 1996

[LOGO: BOSTON * LONDON * TOKYO]




Fund highlights

* "With California's economic and fiscal outlook improving, we have 
positioned the fund to benefit from growing investment opportunities 
while simultaneously exercising appropriate caution on individual 
security selection." 
                                    -- Lindsey C. Strong, Manager
                                       Putnam Money Market Fund

* "Total assets in money funds...reached $856.7 billion at the end of 
August, according to IBC/Financial Data in Ashland, MA, surpassing for 
the first time the $806.4 billion that the Investment Company Institute, 
the Washington trade group, counted in bond/income funds."               
                        -- The New York Times, September 29, 1996     
CONTENTS
4      Report from Putnam Management
8      Fund performance summary
11     Portfolio holdings
13     Financial statements



From the Chairman

[GRAPHIC OMITTED: PHOTO OF GEORGE PUTNAM]

(copyright) Karsh, Ottawa

Dear Shareholder:

Unsettled fixed-income markets and uncertainty over the course of short-
term interest rates provided most of the challenges for Fund Manager 
Lindsey Strong throughout Putnam California Tax Exempt Money Market 
Fund's fiscal year that ended on September 30, 1996. By continually 
adjusting the average maturity of the portfolio and maintaining the 
fund's conservative strategy of investing in high-quality short-term 
investments, she was able to deliver another year of competitive 
performance while maintaining a stable net asset value.

As your fund moves into fiscal 1997, Lindsey sees a continuation of this 
general environment in prospect, especially as the nation and California 
adjust to the results of the November elections. In the report that 
follows, Lindsey discusses in detail the driving forces behind your 
fund's fiscal 1996 performance and her outlook for the fiscal year 
ahead.

Respectfully yours, 

/S/George Putnam

George Putnam

Chairman of the Trustees

November 20, 1996


Report from the Fund Manager
Lindsey C. Strong

In the annual period ended September 30, 1996, Putnam California Tax 
Exempt Money Market Fund once again provided shareholders with a 
competitive total return while focusing on capital preservation and 
maintaining a stable $1.00 share price. The fund's conservative 
investment strategy, which emphasizes superior quality tax-exempt short-
term instruments and the pursuit of current income, served it well 
during the year's environment of continued economic strength, slightly 
higher interest rates, and diminished inflationary expectations. 

* ECONOMIC STRENGTH WITHOUT INFLATION

Economic strength continued throughout the annual period, although 
certain indicators showed some softening as September drew to a close. 
Unemployment figures stayed low, while retail sales, home and vehicle 
sales, and consumer confidence remained relatively robust. At the same 
time, inflationary pressures did not materialize, despite ongoing market 
worries to the contrary. The Federal Reserve Board did not raise short-
term interest rates in September as many had expected, believing that 
the economy would soon slow enough on its own. In fact, over the summer, 
demand did seem to be tapering a bit, as retail sales growth edged 
lower, exports softened, and home sales came off their earlier peaks. 

* CALIFORNIA FISCAL AND ECONOMIC IMPROVEMENT CONTINUES

The California economy also continued to rise throughout the period. The 
positive business climate noted in the semiannual report has continued 
to improve. This additional economic strength, in turn, is increasing 
investment opportunities for the fund. With business activity improving, 
unemployment declining, and home building on the upswing, the state's 
municipal bonds have become increasingly attractive to investors. The 
fiscal situations of many local municipalities are also improving, 
although others remain somewhat tenuous. Accordingly, our investment 
strategy remained exceptionally conservative, and we continued to 
measure the credit quality of individual securities against the highest 
possible standards. 

Improvements in the California economy notwithstanding, considerable 
investor uncertainty remains with respect to the strength of the 
nation's economy, the potential for inflation, and the possibility of a 
Fed interest-rate increase. Given this unclear picture, your portfolio 
remained in a flexible position throughout the annual period. This meant 
keeping portfolio duration relatively neutral -- rather than short or 
long -- in order to be ready to take advantage of incrementally higher 
yields, should interest rates begin to rise. Throughout the period, we 
continued to seek out securities offering strong value and solid yield. 

* SEASONAL SUPPLY SURGE COINCIDES WITH INCREASINGLY CREDIT-CONSCIOUS 
ENVIRONMENT

The supply of municipal securities fluctuates broadly according to 
seasonal patterns throughout the year. Typically, June and July are 
months of heavier tax-exempt securities issuance, and this year was no 
exception. Demand, however, assumed a rather cautious tone during this 
annual period, as buyers exhibited renewed enthusiasm for the most 
conservative money market investments. Essentially, most market 
participants are getting back to basics, eschewing the derivative 
investments that were once such popular income vehicles and scrutinizing 
the credit quality of even those securities once thought to be above 
question. 

Your fund has always maintained extremely strict standards for high 
quality and liquidity in the securities it purchases. In this time of 
interest-rate uncertainty and increased credit consciousness, we have 
redoubled efforts to find well-valued tax-exempt securities that meet 
our criteria. We continue to concentrate the fund's holdings in variable 
rate demand notes (VRDNs) and municipal commercial paper from large top-
quality issuers. VRDNs are instruments that can be redeemed on short 
notice. They pay variable interest rates that reset at daily, weekly, or 
monthly intervals. They are helpful in managing the fund's average 
maturity and liquidity. Commercial paper is a type of security issued by 
a municipality to finance capital or operating needs. 

Currently, the majority of your fund's investments are insured or backed 
by bank letters of credit. The insurance and letters of credit guarantee 
that the short-term debt (money market instruments) in which your fund 
invests will be paid within a certain period. These features add a 
significant measure of quality assurance even to those issues rated in 
the highest categories by nationally recognized rating services, making 
many of our holdings among the highest quality available. We intend to 
maintain the portfolio's high percentage of insured and bank-backed 
securities going forward or even expand it should appropriate investment 
opportunities arise. 

* FAVORABLE ENVIRONMENT FORECAST FOR CALIFORNIA BONDS; NATIONAL OUTLOOK 
MORE CONSERVATIVE

We are cautiously optimistic about prospects for the municipal bond 
market in California. The Golden State's economic and fiscal situations 
seem to be on an upswing, and this bodes well for investors in municipal 
securities. The national perspective, however, is a bit more uncertain. 
It would appear that economic growth has begun to moderate while 
inflationary pressures remain subdued. After expecting the Fed to raise 
interest rates, many market participants even see the possibility of an 
ease in rates should the economy slow significantly. Given these mixed 
signals, we expect the market to remain somewhat unsettled over the near 
term. We believe the portfolio's neutral duration and concentration in 
superior quality issues should continue to serve shareholders well by 
enabling the fund to maintain its stable share price and income stream 
amid this challenging environment. 

The views expressed throughout the report are exclusively those of 
Putnam Management and are not meant as investment advice. Although the 
described holdings were viewed favorably as of 9/30/96, there is no 
guarantee the fund will continue to hold these securities in the future. 



PERFORMANCE COMPARISONS (9/30/96)
                                             Current      After-tax 
                                             return*      return
- ---------------------------------------------------------------------     
Passbook savings account                  2.01%        1.08%
- --------------------------------------------------------------------
Taxable money market fund 7-day yield     4.86         2.61
- --------------------------------------------------------------------
3-month certificate of deposit            4.04         2.17
- --------------------------------------------------------------------
Putnam California Tax Exempt Money 
Market Fund (7-day yield)                 2.96         2.96
- --------------------------------------------------------------------

The net asset value of money market mutual funds is uninsured and 
designed to be fixed, while distributions vary daily. Investment returns 
will fluctuate. The principal value on passbook savings and bank CDs are 
generally insured up to certain limits by state and federal agencies. 
CDs, unlike stocks which incur more risk, offer a fixed rate of return. 
Unlike money market funds, early withdrawals from bank CDs may be 
subject to substantial penalties. After-tax return assumes  a 46.24% 
maximum combined federal and state income tax rate. 
 *Sources: Bank of Boston (passbook savings), IBC/Donaghue's Money Fund 
Report (taxable money market fund 7-day yield), Bank Rate Monitor (3-
month CDs). 



Performance summary

Performance should always be considered in light of a fund's investment 
strategy. Putnam California Tax Exempt Money Market Fund is designed for 
investors seeking current income exempt from federal and state income 
tax, consistent with capital preservation, stable principal and 
liquidity. 

This section provides, at a glance, information about your fund's 
performance. Total return shows how the value of the fund's shares 
changed over time, assuming you held the shares through the entire 
period and reinvested all distributions in the fund.

TOTAL RETURN FOR PERIODS ENDED 9/30/96 

                                      Lipper California 
                                         Tax Exempt           Consumer
                       Fund shares     Money Market           Price
                        at NAV         Fund Average           Index
- -----------------------------------------------------------------------
1 year                    2.74%             2.96%              3.00%
- -----------------------------------------------------------------------
5 years                  12.62             14.15              15.02     
Annual average            2.40              2.68               2.84
- -----------------------------------------------------------------------
Life of fund (10/26/87)  36.20             38.41              36.86
Annual average            3.52              3.71               3.58
- -----------------------------------------------------------------------

Fund performance data do not take into account any adjustment for taxes 
payable on reinvested distributions. Performance data represent past 
results and are not indicative of future returns. Investment returns 
will fluctuate. An investment in the fund is neither insured nor 
guaranteed by the U.S. government. There can be no assurance that the 
fund will be able to maintain a stable net asset value of $1.00 per 
share. The fund's holdings do not match those in the Lipper Average. 

PRICE AND DISTRIBUTION INFORMATION

12 months ended 9/30/96

- ------------------------------------------------------------------------
Distributions (number)                          12     
- ------------------------------------------------------------------------
Income                                       $0.027018
- ------------------------------------------------------------------------
Total                                        $0.027018
- ------------------------------------------------------------------------
Current return
End of period
- ------------------------------------------------------------------------
Current 7-day yield1                          2.96%
- ------------------------------------------------------------------------
Taxable equivalent2                           5.51
- ------------------------------------------------------------------------
Current 30-day yield1                         2.76
- ------------------------------------------------------------------------
Taxable equivalent2                           5.13
- ------------------------------------------------------------------------

  1The 7-day and 30-day yields are the two most common gauges for 
measuring money market mutual fund performance.
 2Assumes maximum 46.24% combined federal and state tax rate. Results 
for investors subject to lower tax rates would not be as advantageous. 
For some investors, investment income may also be subject to the federal 
alternative minimum tax. Investment income may be subject to state and 
local taxes. 



TERMS AND DEFINITIONS

Net asset value (NAV) is the value of all your fund's assets, minus any 
liabilities, divided by the number of outstanding shares.

COMPARATIVE BENCHMARKS

Lipper California Tax Exempt Money Market Fund Average, used for 
performance comparison purposes, is an arithmetic average of the total 
return of all California tax exempt money market mutual funds tracked by 
Lipper Analytical Services. Lipper is an independent rating organization 
for the mutual fund industry. Lipper rankings vary for other periods. 
The fund's holdings do not match those in the Lipper Average. 

Consumer Price Index (CPI) is a commonly used measure of inflation; it 
does not represent an investment return.



Report of independent accountants
For the fiscal year ended September 30, 1996

To the Trustees and Shareholders of 
Putnam California Tax Exempt Money Market Fund 

In our opinion, the accompanying statement of assets and liabilities, 
including the portfolio of investments owned (except for bond ratings), 
and the related statements of operations and of changes in net assets, 
and the financial highlights present fairly, in all material respects, 
the financial position of Putnam California Tax Exempt Money Market Fund 
(the "fund") at September 30, 1996, and the results of its operations, 
the changes in its net assets, and the financial highlights for the 
periods indicated, in conformity with generally accepted accounting 
principles. These financial statements and financial highlights 
(hereafter referred to as "financial statements") are the responsibility 
of the fund's management; our responsibility is to express an opinion on 
these financial statements based on our audits. We conducted our audits 
of these financial statements in accordance with generally accepted 
auditing standards which require that we plan and perform the audit to 
obtain reasonable assurance about whether the financial statements are 
free of material misstatement. An audit includes examining, on a test 
basis, evidence supporting the amounts and disclosures in the financial 
statements, assessing the accounting principles used and significant 
estimates made by management, and evaluating the overall financial 
statement presentation. We believe that our audits, which included 
confirmation of investments owned at September 30, 1996 by 
correspondence with the custodian, provide a reasonable basis for the 
opinion expressed above.

Price Waterhouse LLP 

Boston, Massachusetts 

November 12, 1996



<TABLE>
<CAPTION>

Portfolio of investments owned
September 30, 1996

                   Key to Abbreviations
                   COP  -- Certificate of Participation
                   FGIC -- Federal Guaranty Insurance Corporation
                   LOC  -- Letters of Credit
                   RAN  -- Revenue Anticipation Notes
                   TRAN -- Tax Revenue Anticipation Notes
                   VRDN -- Variable Rate Demand Notes

MUNICIPAL BONDS AND NOTES  (67.1%) *
PRINCIPAL AMOUNT                                                                             RATINGS **                   VALUE

<S>    <C>        <C>                                                                       <C>                      <C>

California  (67.1%)
- -------------------------------------------------------------------------------------------------------------------------------
         $600,000  CA Hlth. Fac. Fin. Auth. VRDN (Sutter Hlth.), 
                   Ser. A, 3.8s, 3/1/20 (Morgan Guaranty Trust Co. LOC)                      VMIG1                      600,000
        1,500,000  CA Hsgs. Fin. Auth. VRDN (Home Mtge) Ser.E, 
                   FGIC 3 1/2s, 8/1/27                                                       VMIG1                    1,500,000
        1,350,000  Ca. Poll. Ctrl. Fing. Auth. VRDN (Chevron USA 
                   Inc. Project), 4s, 11/15/01                                               Aa-2                     1,350,493
        3,000,000  CA. Pub. Cap. Impts. Fing. Auth. VRDN 3.8s, 6/1/28 
                   (Nat'l. Westminister Bk. USA LOC)                                         VMIG1                    3,000,000
        1,500,000  CA St. RAN Ser. A, 41/2s, 6/30/97                                         MIG1                     1,503,979
        1,900,000  Palm Springs Comm. Redev. AG. VRDN 3 1/4s, 
                   12/1/14 (Citibank LOC)                                                    A-1                      1,900,000
        1,380,000  Indio, CA Multi-Fam. Rev. Bonds VRDN, 3.85s, 6/1/05 
                   (Home Savings of America LOC)                                             A-1                      1,380,000
        1,600,000  Los Angeles Cnty. Redev. Mulit-Fam Hsg. VRDN, 
                   3.6s, 4/1/09 (Tokai Bank LOC)                                             VMIG1                    1,600,000
        1,500,000  Los Angeles Cnty. Cmnty. COP. (Willowbrook Project) 
                   VRDN, 3.7s, 11/1/15 (Wells Fargo & Co. LOC)                               A-1                      1,500,000
        1,400,000  Moorpark Multi-Fam. VRDN (Le Club Apartments Project), 
                   3.7s, 11/1/15 (Citibank, NA LOC)                                          A-1+                     1,400,000
        1,500,000  Oakland VRDN COP (Cap. Equip. Project) 4.1s, 
                   12/1/15 (Nat'l. Westminister Bank LOC)                                    A-1                      1,500,000
        2,000,000  Pomona, Redev. Agcy. Multi-Fam. VRDN (Bauer Group Apt.) 
                   4.7s, 12/1/07 (Bank of America LOC)                                       VMIG1                     2,000,000
        1,525,000  Riverside Cnty. Hsg. Auth.. Multi-Fam. VRDN (Mtn. View Apts.), 
                   Ser. A, 3.8s, 8/1/25 (Redlands Federal Savings & Loan LOC)                A-1+                     1,525,000
        1,500,000  Sacramento Cnty. COP VRDN 3s, 6/1/20, (Union Bank of 
                   Switzerland LOC)                                                          VMIG1                    1,500,000
        1,495,000  Sacramento, Cnty. Multi-Fam. Hsg. VRDN (Smoketree), 
                   Ser. A, 3.7s, 4/15/10                                                     A-1+                     1,495,000
        1,500,000  San Bernardino Cnty. TRAN. 4 1/2s, 6/30/97, (The 
                   Toronto-Dominion Bank, Landesbank Hessen-Thuringen LOC)                   MIG1                     1,506,749
        1,400,000  San Diego Hsg. Auth. Multi-Fam. Hsg. VRDN (Paseo Apartments), 
                   Ser. A, 3.85s, 8/1/15  (Bnak of Tokyo LOC)                                VMIG1                    1,400,000
        1,400,000  Stockton, Multi-Fam. Hsg. VRDN 3 3/4s, 9/1/18 
                   (Bank of America LOC)                                                     A-1+                     1,400,000
        1,400,000  Woodland, Multi-Fam. Hsg. Mtge. VRDN (Crossroads) 
                   3.7s, 7/15/18                                                             A-1+                     1,400,000
                                                                                                                     ----------
                   Total Municipal Bonds and Notes  (cost $29,461,221)                                              $29,461,221

MUNICIPAL COMMERCIAL PAPER  (4.8%) *
PRINCIPAL AMOUNT                                                                             RATING **                    VALUE

         $600,000  Los Angeles Cnty. Metropolitan Trans. Auth. Sales Tax, 
                   3.05s, 2/3/96 (Banque Nat'l De Paris LOC)                                 P-1                    $   600,000
        1,500,000  Sacramento Muni. Utility Dist., 3.15s, 11/13/96 
                   (Bayerische LandesBank Girozentrale LOC)                                  P-1                      1,500,000
                                                                                                                     ----------
                   Total Municipal Commercial Paper  (cost $2,100,000)                                              $ 2,100,000
- -------------------------------------------------------------------------------------------------------------------------------
                   Total Investments (cost $31,561,221)***                                                          $31,561,221
- -------------------------------------------------------------------------------------------------------------------------------

*   Percentages indicated are based on net assets of $43,927,417

**  The Moody's or Standard & Poor's ratings indicated are
    believed to be the most recent ratings available at
    September 30, 1996 for the securities listed.  Ratings
    are generally ascribed to securities at the time of
    issuance. While the agencies may from time to time revise
    such ratings, they undertake no obligation to do so, and the
    ratings do not necessarily represent what the agencies would
    ascribe to these securities at September 30, 1996.
    Securities rated by Putnam are indicated by "/P" and
    are not publicly rated. Ratings are not covered by the
    Report of independent accountants.

    Moody's Investor Service, Inc. and Standard & Poor's Corp.
    are the leading independent rating agencies for debt
    securities. Moody's uses the designation "Moody's Investment
    Grade", or "MIG", for most short-term municipal obligations,
    adding a "V" ("VMIG") for bonds with a demand or variable
    feature; the designation "P" is used for tax exempt
    commercial paper.  Standard & Poor's uses "SP" for notes
    maturing in three years or less, "A" for bonds with a demand
    or variable feature.

    Moody's Investors Inc.
    MIGI/VMIGI = Best quality; strong protection of cash flows, superior
    liquidity and broad access to refinancing
    MIG2/VMIG2 = High quality; ample protection of cash flows, liquidity
    support and ability to refinance
    AAA = Extremely strong capacity to pay interest and repay principal
    AA = Strong capacity to pay interest and repay principal and differs
    from the higher rated issues only in a small degree
    Aa2 = Superior capacity for repayment
    P-1 = Superior capacity for repayment
    P-2 = Strong capacity for repayment

    Standard & Poor's Corp.
    SP-1 = Overwhelming safety characteristics
    SP-2 = Strong capacity to pay interest and repay principal.
    A-1+ = Overwhelming degree of credit and protection
    A-1 = Strong degree of safety
    A-2 = Considered strong but lacks solid strength for timely repayment

*** The aggregate identified cost on a tax basis is the same

    The rates shown on VRDN are the current interest rates
    shown at September 30, 1996  which are subject to
    change based on the terms of the security.

    The fund had the following industry group
    concentration greater than 10% on
    September 30, 1996 (as a percentage of net assets):

    Housing    34.4%

The accompanying notes are an integral part of these financial statements.

</TABLE>



<TABLE>
<CAPTION>

Statement of assets and liabilities
September 30,1996

<S>                                                                                      <C>
Assets
- -----------------------------------------------------------------------------------------------------
Investments in securities, at amortized cost (Note 1)                                     $31,561,221
- -----------------------------------------------------------------------------------------------------
Cash                                                                                           29,924
- -----------------------------------------------------------------------------------------------------
Interest and other receivables                                                                186,586
- -----------------------------------------------------------------------------------------------------
Receivable for shares of the fund sold                                                     12,381,332
- -----------------------------------------------------------------------------------------------------
Total assets                                                                               44,159,063

Liabilities
- -----------------------------------------------------------------------------------------------------
Distributions payable to shareholders                                                          64,090
- -----------------------------------------------------------------------------------------------------
Payable for shares of the fund repurchased                                                     61,346
- -----------------------------------------------------------------------------------------------------
Payable for compensation of Manager (Note 2)                                                   35,073
- -----------------------------------------------------------------------------------------------------
Payable for administrative services (Note 2)                                                    1,052
- -----------------------------------------------------------------------------------------------------
Other accrued expenses                                                                         70,085
- -----------------------------------------------------------------------------------------------------
Total liabilities                                                                             231,646
- -----------------------------------------------------------------------------------------------------
Net assets                                                                                $43,927,417

Represented by
- -----------------------------------------------------------------------------------------------------
Paid-in capital (Notes 4)                                                                 $43,927,417
- -----------------------------------------------------------------------------------------------------
Net asset value, offering and redemption price per share 
($43,927,417 divided by 43,927,417 shares)                                                     $1.00
- -----------------------------------------------------------------------------------------------------

The accompanying notes are an intergal part of these financial statements.

</TABLE>



<TABLE>
<CAPTION>

Statement of operations
Year ended September 30, 1996
<S>                                                                                   <C>

Tax exempt interest income                                                             $1,185,257
- -------------------------------------------------------------------------------------------------

Expenses:
- -------------------------------------------------------------------------------------------------
Compensation of Manager (Note 2)                                                          155,509
- -------------------------------------------------------------------------------------------------
Investor servicing and custodian fees (Note 2)                                             63,549
- -------------------------------------------------------------------------------------------------
Compensation of Trustees (Note 2)                                                           5,577
- -------------------------------------------------------------------------------------------------
Administrative services (Note 2)                                                            4,233
- -------------------------------------------------------------------------------------------------
Reports to shareholders                                                                    30,998
- -------------------------------------------------------------------------------------------------
Registration fees                                                                           9,034
- -------------------------------------------------------------------------------------------------
Auditing                                                                                   19,440
- -------------------------------------------------------------------------------------------------
Legal                                                                                       8,936
- -------------------------------------------------------------------------------------------------
Postage                                                                                    21,955
- -------------------------------------------------------------------------------------------------
Other                                                                                         518
- -------------------------------------------------------------------------------------------------
Total expenses                                                                            319,749
- -------------------------------------------------------------------------------------------------
Expense reduction (Note 2)                                                                (76,371)
- -------------------------------------------------------------------------------------------------
Net expenses                                                                              243,378
- -------------------------------------------------------------------------------------------------
Net investment income                                                                     941,879
- -------------------------------------------------------------------------------------------------
Net increase in net assets resulting from operations                                     $941,879
- -------------------------------------------------------------------------------------------------

The accompanying notes are an intergal part of these financial statements.

</TABLE>



<TABLE>
<CAPTION>

Statement of changes in net assets

                                                                                    Year Ended September 30
                                                                                  1996                  1995
                                                                               --------------------------------
<S>                                                                             <C>                 <C>
Increase (decrease) in net assets
- ---------------------------------------------------------------------------------------------------------------
Operations:
- ---------------------------------------------------------------------------------------------------------------
Net investment income                                                            $941,879            $1,340,960
- ---------------------------------------------------------------------------------------------------------------
Net increase in net assets resulting from operations                              941,879             1,340,960
- ---------------------------------------------------------------------------------------------------------------
Distributions to shareholders from:
- ---------------------------------------------------------------------------------------------------------------
Net investment income                                                            (941,879)           (1,340,960)
- ---------------------------------------------------------------------------------------------------------------
Increase (decrease) from capital share transactions (Note 4)                    8,787,774            (9,659,129)
- ---------------------------------------------------------------------------------------------------------------
Total increase (decrease) in net assets                                         8,787,774            (9,659,129)
- ---------------------------------------------------------------------------------------------------------------
Net Assets
- ---------------------------------------------------------------------------------------------------------------
Beginning of year                                                              35,139,643            44,798,772
- ---------------------------------------------------------------------------------------------------------------
End of year                                                                   $43,927,417           $35,139,643
- ---------------------------------------------------------------------------------------------------------------

The accompanying notes are an intergal part of these financial statements.

</TABLE>



<TABLE>
<CAPTION>

Financial highlights
(For a share outstanding throughout the period)


                                                                                        Year ended September 30
                                                                          ------------------------------------------------
                                                                            1996                 1995                1994
                                                                          ------------------------------------------------
<S>                                                                      <C>                   <C>                  <C>
Net investment income                                                     $0.0270              $0.0288              0.0192
- --------------------------------------------------------------------------------------------------------------------------
Net realized and unrealized gain  on investments                               --                  --                   --
- --------------------------------------------------------------------------------------------------------------------------
Total from investment operations                                          $0.0270              $0.0288             $0.0192
- --------------------------------------------------------------------------------------------------------------------------
Total distributions                                                      ($0.0270)            ($0.0288)           ($0.0192)
- --------------------------------------------------------------------------------------------------------------------------
Total investment return at net asset value (%)(b)                           2.74                 2.92                1.94
- --------------------------------------------------------------------------------------------------------------------------
Net assets, end of period (in thousands)                                  $43,927              $35,140             $44,799
- --------------------------------------------------------------------------------------------------------------------------
Ratio of expenses to average net assets (%)(c)                                .93                 1.00                 .67
- --------------------------------------------------------------------------------------------------------------------------
Ratio of net investment income to average net assets (%)                     2.73                 2.84                1.84
- --------------------------------------------------------------------------------------------------------------------------

<CAPTION>

Financial highlights (continued)
(For a share outstanding throughout the period)

                                                                            1993                  1992
                                                                       --------------------------------
<S>                                                                       <C>                 <C>
Net investment income                                                      $0.0175              $0.0262(a)
- -------------------------------------------------------------------------------------------------------
Net realized and unrealized gain  on investments                                --               0.0001
- -------------------------------------------------------------------------------------------------------
Total from investment operations                                           $0.0175              $0.0263
- -------------------------------------------------------------------------------------------------------
Total distributions                                                       ($0.0175)            ($0.0263)
- -------------------------------------------------------------------------------------------------------
Total investment return at net asset value (%)(b)                            1.77                 2.67
- -------------------------------------------------------------------------------------------------------
Net assets, end of period (in thousands)                                   $45,364              $58,858
- -------------------------------------------------------------------------------------------------------
Ratio of expenses to average net assets (%)(c)                                 .89                  .85 (a)
- -------------------------------------------------------------------------------------------------------
Ratio of net investment income to average net assets (%)                      1.78                 2.70 (a)
- -------------------------------------------------------------------------------------------------------

(a) Reflects an expense limitation in effect during the period. As a result of such limitation, expenses 
    of the fund for the year ended September 30, 1992 reflect a per share reduction of $.0026.

(b) Total investment return assumes dividend reinvestment and does not reflect the effect of sales charges.

(c) The ratio of expenses to average net assets for the year ended September 30, 1995 and thereafter 
    includes amounts paid through expense offset arrangements. Prior Period ratios exclude these amounts. 
    (See Note 2.)

</TABLE>



Notes to financial statements
September 30, 1996 

Note 1 
Significant accounting policies

The fund is registered under the Investment Company Act of 1940, as 
amended, as a diversified, open-end management investment company. The 
fund seeks as high a level of current income exempt from federal income 
tax and California personal income tax as is consistent with 
preservation of capital, maintenance of liquidity and stability of 
principal by investing primarily in a diversified portfolio of short-
term California tax-exempt securities.

The following is a summary of significant accounting policies 
consistently followed by the fund in the preparation of its financial 
statements. The preparation of financial statements is in conformity 
with generally accepted accounting principles and requires management to 
make estimates and assumptions that affect the reported amounts of 
assets and liabilities. Actual results could differ from those 
estimates.

A) Security valuation The valuation of the fund's portfolio instruments 
is determined by means of the amortized cost method as set forth in Rule 
2a-7 under the Investment Company Act of 1940. The amortized cost which 
approximates market value of an instrument is determined by valuing it 
at cost originally and thereafter amortizing any discount or premium 
from its face value at a constant rate until maturity.

B) Security transactions Security transactions are accounted for on the 
trade date (date the order to buy or sell is executed).

C) Federal taxes It is the policy of the fund to distribute all of its 
income within the prescribed time and otherwise comply with the 
provisions of the Internal Revenue Code applicable to regulated 
investment companies. It is also the intention of the fund to distribute 
an amount sufficient to avoid imposition of any excise tax under Section 
4982 of the Internal Revenue Code of 1986. Therefore, no provision has 
been made for federal taxes on income, capital gains or unrealized 
appreciation on securities held and for excise tax on income and capital 
gains.

D) Interest income and distributions to shareholders Interest is 
recorded on the accrual basis. Income dividends (and distributions of 
realized gains, if any) are recorded daily by the fund and are 
distributed monthly to the shareholders. The amount and character of 
income and gains to be distributed are determined in accordance with 
income tax regulations which may differ from generally accepted 
accounting principles.

Note 2
Management fee, administrative services and other transactions

Compensation of Putnam Investment Management, Inc. ("Putnam 
Management"), the fund's Manager, a wholly-owned subsidiary of Putnam 
Investments, Inc., for management and investment advisory services is 
paid quarterly based on the average net assets of the fund. Such fee is 
based on the following annual rates: 0.45% of the first $500 million of 
average net assets, 0.35% of the next $500 million, 0.30% of the next 
$500 million, and 0.25% of any amount thereafter subject, under current 
law, to reduction in any year by the amount of certain brokerage 
commissions and fees (less expenses) received by affiliates of Putnam 
Management on the fund's portfolio transactions.

The fund reimburses Putnam Management for the compensation and related 
expenses of certain officers of the fund and their staff who provide 
administrative services to the fund. The aggregate amount of all such 
reimbursements is determined annually by the Trustees.

Custodial functions for the fund's assets are provided by Putnam 
Fiduciary Trust Company (PFTC), a wholly-owned subsidiary of Putnam 
Investments, Inc. Investor servicing agent functions are provided by 
Putnam Investor Services, a division of PFTC. 

For the year ended September 30, 1996, fund expenses were reduced by 
$76,371 under expense offset arrangements with PFTC. Investor servicing 
and custodian fees reported in the Statement of operations exclude these 
credits. The fund could have invested a portion of the assets utilized 
in connection with the expense offset arrangements in an income 
producing asset if it had not entered into such arrangements.

Trustees of the fund receive an annual Trustees fee of $380 and an 
additional fee for each Trustees' meeting attended. Trustees who are not 
interested persons of Putnam Management and who serve on committees of 
the Trustees receive additional fees for attendance at certain committee 
meetings.

The fund adopted a Trustee Fee Deferral Plan (the "Plan") which allows 
the Trustees to defer the receipt of all or a portion of Trustees Fees 
payable on or after July 1, 1995. The deferred fees remain in the fund 
and are invested in certain Putnam funds until distribution in 
accordance with the Plan.

The fund has adopted a distribution plan (the "Plan") pursuant to Rule 
12b-1 under the Investment Company Act of 1940. The purpose of the Plan 
is to compensate Putnam Mutual Funds Corp., a wholly-owned subsidiary of 
Putnam Investments, Inc., for services provided and expenses incurred by 
it in distributing shares of the fund. The Plan provides for payment by 
the fund to Putnam Mutual Funds Corp. at an annual rate of up to 0.35% 
of the fund's average net assets. Currently, no payments are being made 
under the plan.

Putnam Mutual Funds Corp., acting as underwriter receives proceeds from 
contingent deferred sales charges. These charges apply to certain shares 
that have been exchanged from other Putnam funds. Putnam Mutual Funds 
Corp. received no monies in contingent deferred sales charges from such 
redemptions for the year ended September 30, 1996.

Note 3 
Purchase and sales securities

During the year ended September 30, 1996, purchases and sales (including 
maturities) of investment securities (all short-term obligations) 
aggregated $71,129,009 and $74,980,000 respectively. In determining the 
net gain or loss on securities sold, the cost of securities has been 
determined on the identified cost basis.

Note 4
Capital shares

At September 30, 1996, there was an unlimited number of shares of 
beneficial interest authorized. Transactions in capital shares at a 
constant net value of $1.00 per share were as follows:

                                         Year ended 
                                         September 30
                                      1996            1995
- ----------------------------------------------------------
Shares sold                     98,400,833     114,301,007
- ----------------------------------------------------------
Shares issued in 
connection with 
reinvestment of 
distributions                      874,218       1,230,354
- ----------------------------------------------------------
                                99,275,051     115,531,361

Shares 
repurchased                    (90,487,277)   (125,190,490)
- -----------------------------------------------------------
Net increase 
(decrease)                       8,787,774      (9,659,129)
- -----------------------------------------------------------

Federal tax information
(Unaudited)

The fund has designated 100% of dividends paid from net investment 
income during the fiscal year as tax exempt for Federal income tax 
purposes.

The Form 1099 you receive in January 1997 will show the tax status of 
all distributions paid to your account in calendar 1996.


Results of September 5, 1996 shareholder meeting
(Unaudited)

A meeting of shareholders of the fund was held on September 5, 1996. At 
the meeting, each of the nominees for Trustees was elected, as follows: 
                                                             Votes
                                           Votes for       withheld
Jameson Adkins Baxter                      23,694,416       326,477
Hans H. Estin                              23,695,527       325,366
John A. Hill                               23,727,096       293,797
R.J. Jackson                               23,695,920       324,973
Elizabeth T. Kennan                        23,694,416       326,477
Lawrence J. Lasser                         23,727,096       293,797
Robert E. Patterson                        23,727,096       293,797
Donald S. Perkins                          23,727,096       293,797
William F. Pounds                          23,727,096       293,797
George Putnam                              23,727,096       293,797
George Putnam, III                         23,714,302       306,591
E. Shapiro                                 23,664,351       356,542
A.J.C. Smith                               23,727,096       293,797
W. Nicholas Thorndike                      23,727,096       293,797

A proposal to ratify the Trustees' selection of Price Waterhouse LLP as 
auditors for the fund was approved as follows: 22,733,274 votes for, and 
60,508 votes against, with 1,227,112 abstentions and broker non-votes.

A proposal to amend the fund's fundamental investment restriction with 
respect to diversification of investments was approved as follows: 
21,831,572 votes for, and 956,032 votes against, with 1,233,290 
abstentions and broker non-votes. 

A proposal to amend the fund's fundamental investment restriction with 
respect to investments in the securities of a single issuer was approved 
as follows: 21,164,706 votes for, and 1,439,139 votes against, with 
1,417,049 abstentions and broker non-votes. 

A proposal to amend the fund's fundamental investment restriction with 
respect to making loans through purchases of debt obligations, 
repurchase agreements and securities loans was approved as follows: 
20,914,211 votes for, and 1,900,232 votes against, with 1,206,449 
abstentions and broker non-votes. 

A proposal to amend the fund's fundamental investment restriction with 
respect to investments in real estate was approved as follows: 
19,830,131 votes for, and 2,890,877 votes against, with 1,299,884 
abstentions and broker non-votes. 

A proposal to amend the fund's fundamental investment restriction with 
respect to senior securities was approved as follows: 21,587,884 votes 
for, and 1,127,771 votes against, with 1,305,238 abstentions and broker 
non-votes. 

A proposal to amend the fund's fundamental investment restriction with 
respect to concentration of its assets was approved as follows: 
21,664,770 votes for, and 1,006,217 votes against, with 1,369,906 
abstentions and broker non-votes. 

A proposal to eliminate the fund's fundamental investment restriction 
with respect to investments in securities of issuers in which management 
of the fund or Putnam Investment Management, Inc. owns securities was 
approved as follows: 20,173,483 votes for, and 1,693,490 votes against, 
with 2,163,920 abstentions and broker non-votes. 

A proposal to eliminate the fund's fundamental investment restriction 
with respect to margin transactions was approved as follows: 20,435,493 
votes for, and 2,240,986 votes against, with 1,344,414 abstentions and 
broker non-votes. 

A proposal to eliminate the fund's fundamental investment restriction 
with respect to short sales was approved as follows: 21,066,399 votes 
for, and 2,337,635 votes against, with 1,420,249 abstentions and broker 
non-votes. 

A proposal to eliminate the fund's fundamental investment restriction 
which limits the fund's ability to pledge assets was approved as 
follows: 20,263,009 votes for, and 2,337,635 votes against, with 
1,420,249 abstentions and broker non-votes. 

A proposal to eliminate the fund's fundamental investment restriction 
with respect to investments in restricted securities was approved as 
follows: 20,677,762 votes for, and 2,053,562 votes against, with 
1,289,569 abstentions and broker non-votes. 


Fund information

INVESTMENT MANAGER

Putnam Investment 
Management, Inc.
One Post Office Square
Boston, MA 02109

MARKETING SERVICES

Putnam Mutual Funds Corp. 
One Post Office Square
Boston, MA 02109

CUSTODIAN

Putnam Fiduciary Trust Company

LEGAL COUNSEL

Ropes & Gray

INDEPENDENT ACCOUNTANTS

Price Waterhouse LLP

TRUSTEES

George Putnam, Chairman
William F. Pounds, Vice Chairman
Jameson Adkins Baxter
Hans H. Estin
John A. Hill
Ronald J. Jackson
Elizabeth T. Kennan
Lawrence J. Lasser
Robert E. Patterson
Donald S. Perkins
George Putnam, III
Eli Shapiro
A.J.C. Smith
W. Nicholas Thorndike

OFFICERS

George Putnam
President 

Charles E. Porter
Executive Vice President

Patricia C. Flaherty
Senior Vice President

John D. Hughes
Senior Vice President and Treasurer

Lawrence J. Lasser
Vice President 

Gordon H. Silver
Vice President 

Gary N. Coburn
Vice President

William F. McGue
Vice President

Blake E. Anderson
Vice President

Lindsey C. Strong
Vice President and Fund Manager 

William N. Shiebler
Vice President 

John R. Verani
Vice President 

Paul M. O'Neil
Vice President 

John D. Hughes
Vice President and Treasurer 

Beverly Marcus
Clerk and Assistant Treasurer

This report is for the information of shareholders of Putnam California 
Tax Exempt Money Market Fund. It may also be used as sales literature 
when preceded or accompanied by the current prospectus, which gives 
details of sales charges, investment objectives, and operating policies 
of the fund, and the most recent copy of Putnam's Quarterly Performance 
Summary. For more information or to request a prospectus, call toll-
free: 1-800-225-1581. You can also learn more at Putnam Investments' 
website: http://www.putnaminv.com.

Shares of mutual funds are not deposits or obligations of, or guaranteed 
or endorsed by, any financial institution, are not insured by the 
Federal Deposit Insurance Corporation (FDIC), the Federal Reserve Board 
or any other agency, and involve risk, including the possible loss of 
the principal amount invested.



Putnam
Investments

The Putnam Funds
One Post Office Square
Boston, Massachusetts 02109

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Bulk Rate 
U.S. Postage
PAID
Putnam
Investments
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28360-064      11/96



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