PUTNAM CALIFORNIA TAX EXEMPT MONEY MARKET FUND
N-30D, 1995-12-01
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                                  Putnam 
                                  California 
                                  Tax Exempt 
                                  Money Market 
                                  Fund 
 

ANNUAL REPORT 
September 30, 1995 
                             [Putnam scales logo] 
                    B O S T O N * L O N D O N * T O K Y O 

<PAGE>
 
 
Performance highlights 
> "In just five years, total assets of money funds have grown by 72%, and in 
  the not too distant future, assets should break the elusive $1 trillion 
  barrier. . . . There are many factors contributing to asset growth. One of 
  the most important has been the tremendous acceptance of money funds as a 
  viable cash alternative to traditional market securities." 
  --IBC Money Market Insight, September 1995 
 

 
> 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 free from federal and California personal 
  income taxes, consistent with capital preservation, stable principal and 
  liquidity. 
 

FISCAL 1995 RESULTS AT A GLANCE 

<TABLE>
<CAPTION>
 Total return                                     NAV 
<S>                          <C>  <C>          <C>
 ............................................................. 
12 months ended 9/30/95 
(change in value during 
period plus reinvested 
distributions)                                      2.92% 
Distributions                No.     Income        Total 
 ............................................................. 
                             12   $0.028848    $0.028848 
Current return 
 ............................................................. 
End of period 
Current 7-day SEC yield(1)                          3.05% 
Taxable equivalent(2)                               5.67 
Current 30-day SEC yield(1)                         2.79 
Taxable equivalent(2)                               5.19 
</TABLE>

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

                                       2
<PAGE>
 
From the Chairman 

[photo of George Putnam] 

 
(c)Karsh, Ottawa 

Dear Shareholder: 
 

Putnam California Tax Exempt Money Market Fund ends one fiscal year and 
begins another in one of the most lively bond markets in years. Inflation 
appears to have peaked at 3%, a lower level than in the mid-1980s. With 
modest growth, it could fall lower, making real yields even more attractive 
than they are now. 

 
This favorable environment belies the challenges your fund faced during the 
12 months ended September 30, 1995, as the economy slowed and interest rates 
- -- especially short-term rates -- began a descent. The decline in short-term 
rates was foreshadowed when the Federal Reserve Board opted not to adjust 
rates upward in February and then was confirmed as the Fed actually lowered 
rates a notch in July. 
 

Fund Manager Lindsey Strong's challenge in this environment was to stay ahead 
of the trend, which she did by extending the average maturity of the 
securities in the portfolio. She made the move before the Fed's July rate 
cut, thus helping the fund maintain its competitive edge. Lindsey's report 
for fiscal 1995 and her outlook for the months ahead appear on the following 
pages. 

Respectfully yours, 

(signature of George Putnam) 

 
George Putnam 
Chairman of the Trustees 
November 15, 1995 
 


                                       3
<PAGE>
 
Report from the Fund Manager 
Lindsey C. Strong 

 
During the 12 months ended September 30, 1995, Putnam California Tax Exempt 
Money Market Fund once again generated a competitive return. Faced with the 
challenge of maintaining a high-quality portfolio at a time when the supply 
of tax-exempt securities was relatively low, your fund rose to the occasion. 
Throughout the period, our conservative approach of investing in high-quality 
short-term instruments resulted in a steady stream of double-tax-free income 
and a stable price of $1.00 per share. 
 

> A CHANGED INVESTMENT ENVIRONMENT 

The investment environment in which your fund was managed changed 
dramatically during the period. During the last quarter of 1994, economic 
growth remained strong and concerns about increased inflation dominated the 
financial markets. At that time, the Federal Reserve Board's anti-inflation 
policy of periodically raising short-term interest rates was in full force. 

 
Even as the Fed was raising rates for the last time in February 1995, the 
success of its anti-inflation policy was becoming apparent. The growth in 
gross domestic product (GDP) slowed from 5.1% during the fourth quarter of 
1994 to 2.8% during the first quarter of 1995. During the second quarter of 
1995, GDP growth declined to 0.5%. By early summer, recession fears began to 
mount, and in July, the Fed lowered short-term interest rates from 6.0% to 
5.75%. Toward the end of the summer, leading economic indicators began to 
show signs of strength, and recession concerns abated. However, the Fed took 
no other action. 
 

The California economy continued to gain strength during the period. After 
the disruptions caused by the Orange County bankruptcy and a series of 
natural disasters, major indicators showed relatively strong growth and an 
improved business climate. While it still lags the national economy, 
California seems to be on the road to recovery. 

                                       4
<PAGE>
 
 
> CAPITALIZING ON INTEREST-RATE MOVES 
 

 
As interest rates fluctuated during the period, our strategy centered on 
maximizing income while at the same time maintaining a very high-quality 
portfolio of securities. To this end, while interest rates were rising, we 
shortened the average maturity of the portfolio. This allowed us to take 
advantage of incrementally higher yields. 
 

 
When it became apparent that rates were unlikely to rise further, we reversed 
our approach, seeking to lock in higher yields by lengthening the average 
maturity of the portfolio. Finally, toward the end of the fiscal year, as 
interest rates became somewhat uncertain, we put the fund's average maturity 
in a more neutral position. It is no longer as short as it was very early in 
the period, nor is it as long as it was in the summer. 
 

 
> SECURITY SELECTION FOCUSED ON QUALITY 
 

 
Typically, the supply of tax-exempt securities ebbs and flows throughout the 
year. Because the fiscal year for many municipalities begins in June or July, 
new issues of tax-exempt securities are usually plentiful during the summer 
months. While new 
 

 
PERFORMANCE COMPARISONS (9/30/95) 
 

<TABLE>
<CAPTION>
                                      Current    After-tax 
                                      return*     return 
<S>                                     <C>        <C>
 .............................................................. 
 Passbook savings account               2.01%      1.08% 
 .............................................................. 
 Taxable money-market fund 
   7-day yield                          5.35       2.88 
 .............................................................. 
 3-month certificate of deposit 
   (as of 9/21/95) (CD)                 3.26       1.75 
 .............................................................. 
 Putnam California Tax Exempt 
 Money Market Fund (7-day yield)        3.05       3.05 
</TABLE>

 
The net asset value of money-market mutual funds is uninsured and designed to 
be fixed, while distributions vary daily. The principal values on passbook 
savings and bank CDs are generally insured up to certain limits by state and 
federal agencies. CDs--unlike money-market funds, 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. Investment 
returns will fluctuate. After-tax return assumes a combined 46.24% federal 
and state tax rate. 
 

 
*Sources: Bank of Boston (passbook savings), Bank Rate Monitor (3-month CDs), 
IBC/Donaghue's Money Fund Report (taxable money-market fund 7-day yield). 
 


                                       5
<PAGE>
 
 
issuance of California securities has lagged that of previous years, we were 
still able to find securities that measured up to our strict standards for 
high quality and liquidity. 
 

In selecting securities for the portfolio, we invested in variable rate 
demand notes (VRDNs). VRDNs pay variable interest rates that reset at daily, 
weekly, or monthly intervals. Nearly 80% of your fund's investments are 
insured or backed by bank letters of credit. These features enhance the 
quality assurance of the securities in the portfolio, even those rated in the 
highest categories by nationally recognized rating services. 

> OUR OUTLOOK 

As always, we will be monitoring the national and the California economies 
very carefully in the coming months. Because the Federal Reserve Board seems 
to have achieved its goal of low inflation and a slowly growing economy, we 
believe interest rates could decline modestly in the months ahead. However, 
we do not expect to see extremely steep declines in rates such as the ones we 
experienced in 1993. 

 
Because your fund's average maturity is relatively neutral, we believe it is 
well positioned to generate a relatively high amount of tax-free income even 
if rates decline. In the months ahead, we will continue to seek a competitive 
amount of income by investing in a well-diversified portfolio of tax-exempt 
money market instruments and, as always, maintaining our emphasis on 
stability of principal, high quality, and liquidity. 
 

 
The views expressed throughout the report are exclusively those of Putnam 
Management and are not meant as investment advice. Although the current 
holdings were viewed favorably as of 9/30/95, there is no guarantee the fund 
will continue to hold these securities in the future. 
 


                                       6
<PAGE>
 
Performance summary 

 
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 back into the fund. We show total return in two 
ways: on a cumulative long-term basis and on average how the fund might have 
grown each year over varying periods. 
 

TOTAL RETURN FOR PERIODS ENDED 9/30/95 

<TABLE>
<CAPTION>
                                           Lipper California 
                          Fund shares          Tax Exempt           Consumer 
                               at             Money Market           Price 
                              NAV             Fund Average           Index 
<S>                          <C>                 <C>                 <C>
1 year                        2.92%               3.24%               2.54% 
5 years                      14.17               15.70               15.45 
Annual average                2.69                2.96                2.91 
Life of fund (10/26/87)      32.57               34.22               32.87 
Annual average                3.62                3.79                3.65 
</TABLE>

 
Performance data represent past results and should not be taken as an 
assurance of future performance. 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. 
 

 
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 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. 

                                       7
<PAGE>
 
 
Report of independent accountants 
For the fiscal year ended September 30, 1995 
 

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, 1995, 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 of 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 from 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, 1995 by correspondence with the custodian, 
provide a reasonable basis for the opinion expressed above. 
 

 
Price Waterhouse LLP 
Boston, Massachusetts 
November 14, 1995 
 


                                       8
<PAGE>
 
 
Portfolio of investments owned 
September 30, 1995 

Key to Abbreviations 
FGIC  -- Federal Guaranty Insurance Corporation 
LOC   -- Letter of Credit 
VRDN  -- Variable Rate Demand Notes 

<TABLE>
<CAPTION>
MUNICIPAL BONDS AND NOTES (84.8%)* 
PRINCIPAL AMOUNT                                            RATINGS**       VALUE 
<S>             <C>                                            <C>        <C>
California 
 $1,400,000     Alameda Cnty. Transn. Auth. Sales Tax 
                Rev. Bonds, FGIC 4-1/2s, 5/1/96                  AAA      $ 1,404,840 
  1,770,000     CA Hlth. Facs. Fing. Auth. VRDN (Good 
                Samaritan Hlth. Syst), Ser. A, 3-1/2s, 
                8/1/17 (Bk. of Amer. Nat'l. Tr. & Svgs. 
                Assoc. LOC)                                    VMIG1        1,770,000 
  3,000,000     CA Pub. Cap Impts. Fing. Auth. VRDN Ser. 
                C, 3.75s, 6/1/28 (National Westminster 
                Bk. USA Letter of Credit LOC)                  VMIG1        3,000,000 
  1,810,000     Loma Linda, Hosp. VRDN (U. Med. Ctr. ) 
                Ser. C, 4.3s, 12/1/15 (The Indl. Bk. of 
                Japan LOC)                                       A-1        1,810,000 
    500,000     Los Angeles Cnty., Hsg. Auth. Multi-Fam. 
                VRDN (Malibu Meadows II Projects ) 
                Ser. B, 4.25s, 12/1/15 (Sumitomo Bk. 
                LOC)                                             A-1          500,000 
  1,800,000     Monterey Peninsula, Wtr. Mgmt. Dist. 
                VRDN COP (Waste Wtr. Reclamation 
                Project), 4.35s, 7/1/22 (Sumitomo Bk., 
                Ltd. LOC)                                      VMIG1        1,800,000 
  1,500,000     Moorpark Multi-Family VRDN (Le Club 
                Apts. Project) 4.25s, 11/1/15 (Citibank, 
                NA LOC)                                         A-1+        1,500,000 
  2,000,000     Oakland VRDN (Cap. Equip. Project) 4.5s, 
                12/1/15 (National Westminster Bk. PLC 
                LOC)                                             A-1        2,000,000 
                Palm Springs, Cmnty. Redev. Agcy. VRDN 
                COP 
  1,900,000      (Headquarters Hotel 10 Project) 4s, 
                 12/1/14 (Citibank NY LOC)                      A-1+        1,900,000 
    200,000      (Headquarters Hotel 7 Project) 4s, 
                 12/1/14 (Citibank NY LOC)                      A-1+          200,000 
  2,000,000     Pomona Redev. Agcy. Multi-Fam. VRDN 
                (Bauer Group Apt.) 4.85s, 12/1/07 
                (Mercury Savings & Loan LOC)                    A-1+        2,000,000 
  1,525,000     Riverside Cnty. Hsg. Auth. Multi-Fam. 
                VRDN (Mtn. View Apts.) Ser. A, 3-1/2s, 
                8/1/25 (Redlands Federal Savings & Loan 
                LOC)                                            A-1+        1,525,000 
  1,495,000     Sacramento, Cnty. Multi- Fam. Hsg. VRDN 
                (Smoketree), Ser A 4.2s, 4/15/10                A-1+        1,495,000 
</TABLE>

                                       9
<PAGE>
 
<TABLE>
<CAPTION>
MUNICIPAL BONDS AND NOTES 
PRINCIPAL AMOUNT                                          RATINGS**      VALUE 
<S>             <C>                                          <C>       <C>
California (continued) 
 $2,000,000     San Diego Cmty. Regl. Transn. Comm. 
                Sales Tax Rev. Bonds, FGIC, Ser. A, 
                4.75s, 4/1/96                                 AAA      $ 2,007,372 
  1,800,000     San Diego, Hsg. Auth. Multi-Fam. VRDN 
                (Paseo Pt. Apts. ) Ser. A, 4.3s, 
                8/1/15 
                (Bk. of Tokyo LOC)                           VMIG1       1,800,000 
  2,000,000     Upland, Hsg. Auth. Multi-Fam. VRDN 
                (Upland Village Green Project), 4.3s, 
                9/1/10 
                (Bank of Tokyo LOC)                          VMIG1       2,000,000 
  1,100,000     Vallejo Hsg. Auth. Multi-Fam. VRDN 
                3.65s, 5/15/22                                A-1+       1,100,000 
  2,000,000     Woodland Multi-Fam. Mtg. VRDN 3.65s, 
                7/15/18                                       A-1+       2,000,000 
                Total Municipal Bonds and Notes 
                (cost $29,812,212)                                     $29,812,212 
</TABLE>

<TABLE>
<CAPTION>
MUNICIPAL COMMERCIAL PAPER (15.9%)* 
PRINCIPAL AMOUNT                                           RATINGS**      VALUE 
<S>             <C>                                           <C>       <C>
 $2,000,000     CA Poll. Control VRDN (Pacific Gas & Elec. 
                 Co.) 4.15s, 10/11/95 (Morgan Gnty. LOC)      A-1+      $ 2,000,000 
  1,800,000     Los Angeles Cnty. Metropolitan Trans. Auth. 
                Sales Tax 3.4s 10/6/95 (National 
                Westminister Banque, Nationale de Paris, 
                Canadian Imperial Bank of Commerce, Bank 
                                         Of Canada: LOC)       P-1        1,800,000 
  1,800,000     Sacramento Muni. Utility Dist. 3.6s, 12/1/95 
                (Bayerisch Landes Bank Girozentrale LOC)       P-1        1,800,000 
                Total Municipal Commercial Paper (cost 
                                             $5,600,000)                $ 5,600,000 
                 Total Investments (cost $35,412,212)***                $35,412,212 
</TABLE>

 
 * Percentages indicated are based on total net assets of $35,139,643 which 
   correspond to a net asset value per share of $1.00 
 

 
** The Moody's or Standard & Poor's ratings indicated are believed to be the 
   most recent ratings available at September 30, 1995, 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 obligations do so, and the ratings do not necessarily 
   represent what the agencies would ascribe to these securities at September 
   30, 1995. Securities rated by Putnam are indicated by "/P" and are not 
   publicly rated. These ratings are not covered by the Report of independent 
   accountants. 
   Moody's Investors 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. 
 


                                       10
<PAGE>
 
 
Moody's Investor Service, Inc. 
MIG1/VMIG1 = Best quality; strong protection of cash flow, superior liquidity 
             and broad access to refinancing 
MIG2/VMIG2 = High quality; ample protection of cash flow, liquidity support 
             and ability to refinance 
AAA = Strong capacity to pay interest and repay principal and differs from 
      the higher rated issues only in a small degree 
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 principal and interest 
A-1+= Overwhelming degree of credit 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 Variable Rate Demand Notes (VRDN) are the current interest 
rates at September 30, 1995 which are subject to change based on the terms of 
the security. 

The fund had the following industry group concentrations greater than 10% on 
September 30, 1995 (as a percentage of net assets): 

<TABLE>
<CAPTION>
           <S>                              <C>
           Housing                          45.6% 
           Building & construction          19.4 
           Hospital/healthcare              10.2 
</TABLE>

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

                                       11
<PAGE>
 
 
Statement of assets and liabilities 
September 30, 1995 
<TABLE>
<CAPTION>
 Assets 
<S>                                                               <C>
Investments in securities, at amortized cost (Note 1)             $35,412,212 
Cash                                                                   25,578 
Interest and other receivables                                        232,113 
Receivable for shares of the fund sold                                 35,809 
Total assets                                                       35,705,712 
Liabilities 
Payable for shares of the fund repurchased                            390,294 
Distributions payable to shareholders                                  78,817 
Payable for compensation of Manager (Note 2)                           43,413 
Payable for compensation of Trustee (Note 2)                              104 
Payable for administrative services (Note 2)                            1,252 
Payable for investor servicing and custodian fees (Note 2)             15,286 
Other accrued expenses                                                 36,903 
Total liabilities                                                     566,069 
Net assets                                                        $35,139,643 
Represented by 
Paid-in capital (Note 4)                                          $35,139,643 
Net asset value, offering and redemption price per share 
($35,139,643 divided by 35,139,643 shares)                              $1.00 
</TABLE>
 

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

                                       12
<PAGE>
 
 
Statement of operations 
Year ended September 30, 1995 
 

<TABLE>
<CAPTION>
<S>                                                 <C>
Tax exempt interest income                          $1,682,146 
Expenses: 
Compensation of Manager (Note 2)                       214,060 
Investor servicing and custodian fees (Note 2)         110,238 
Compensation of Trustees (Note 2)                        5,627 
Reports to shareholders                                 32,146 
Auditing                                                25,358 
Legal                                                   70,245 
Postage                                                  3,193 
Registration                                             5,579 
Administrative services (Note 2)                         5,100 
Other expenses                                             707 
Total expenses                                         472,253 
Fees paid indirectly (Note 2)                         (131,067) 
Net expenses                                           341,186 
Net investment income                                1,340,960 
Net increase in net assets resulting from 
operations                                          $1,340,960 
</TABLE>

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

                                       13
<PAGE>
 
Statement of changes in net assets 
<TABLE>
<CAPTION>
                                                              Year ended 
                                                             September 30 
                                                          1995          1994 
<S>                                                   <C>            <C>
Decrease in net assets 
Operations: 
Net investment income                                 $ 1,340,960    $   896,489 
Net increase in net assets resulting from 
operations                                              1,340,960        896,489 
Distributions to shareholders from: 
Net investment income                                  (1,340,960)      (896,489) 
Decrease from capital share transactions (Note 4)      (9,659,129)      (565,336) 
Total decrease in net assets                           (9,659,129)      (565,336) 
Net assets 
Beginning of year                                      44,798,772     45,364,108 
End of year                                           $35,139,643    $44,798,772 
</TABLE>

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

                                       14
<PAGE>
 
Financial highlights 
(For a share outstanding throughout the period) 

<TABLE>
<CAPTION>
                                                       Year ended September 30 
                                        1995        1994        1993       1992         1991 
<S>                                   <C>         <C>         <C>         <C>           <C>
Net investment income                  $0.0288     $0.0192     $.0175      $.0262(a)     $.0407(a) 
Net realized gain on investments         --          --          --         .0001        -- 
Total from investment operations       $0.0288     $0.0192     $.0175      $.0263        $.0407 
Total distributions:                  ($0.0288)   ($0.0192)   ($.0175)    ($.0263)      ($.0407) 
Total investment return at net 
asset value (%) (b)                       2.92        1.94       1.77        2.67          4.15 
Net assets, end of period 
(in thousands)                         $35,140     $44,799    $45,364     $58,858       $69,184 
Ratio of expenses to average net 
assets (%) (c)                            1.00         .67        .89         .85(a)        .80(a) 
Ratio of net investment income to 
average net assets (%)                    2.84        1.84       1.78        2.70(a)       4.03(a) 
</TABLE>

(a) Reflects an expense limitation in effect during the period. As a result 
    of such limitation, expenses of the fund for the years ended September 
    30, 1992 and 1991 reflect per share reductions of $0.0026 and $0.0033, 
    respectively. 

(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 includes amounts paid through expense offset arrangements. Prior 
    period ratios exclude these amounts. See Note 2. 
 


                                       15
<PAGE>
 
Notes to financial statements 
September 30, 1995 

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 
policies are in conformity with generally accepted accounting principles. 

 
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 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 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 income and excise 
taxes on income and capital gains. 
 

 
D) Interest income and distributions to shareholders Interest is recorded on 
the accrual basis. Income dividends (and distributions of capital gains, if 
any) are recorded daily by the fund and are distributed monthly to 
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 
over $1.5 billion, 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. 
 


                                       16
<PAGE>
 
 
Trustees of the fund receive an annual Trustee's fee of $390 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. 
 

During the year ended September 30, 1995, 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 the fund or in other 
Putnam funds until distribution in accordance with the Plan. 

 
Custodial functions for the fund's assets are provided by the 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, 1995, fund expenses were reduced by $131,067 
under expenses 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 offset arrangements in an income- producing asset if it had not 
entered into such arrangements. 
 

 
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 payments by the fund 
to Putnam Mutual Funds Corp. at an annual rate up to 0.35% of the average net 
assets of the fund. Currently, no payments are being made under the plan. 
 

 
Putnam Mutual Funds Corp., acting as the underwriter, receives proceeds from 
contingent deferred sales charges. These charges apply only to certain shares 
that have been exchanged from other Putnam Funds. Putnam Mutual Funds Corp. 
received $24,973 in contingent sales charges from such redemptions for the 
year ended September 30, 1995. 
 

Note 3 
Purchases and sales of securities 

During the year ended September 30, 1995, purchases and sales (including 
maturities) of investment securities (all short-term obligations) aggregated 
$103,096,431 and $111,695,057, 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, 1995, there was an unlimited number of shares of beneficial 
interest authorized. Transactions in capital shares, at a constant net asset 
value of $1.00 per share, were as follows: 
<TABLE>
<CAPTION>
                                          Year ended September 30 
                                           1995             1994 
<S>                                    <C>              <C>
Shares sold                             114,301,007      125,528,473 
Shares issued in connection with 
reinvestment of distributions             1,230,354          834,320 
                                        115,531,361      126,362,793 
Shares repurchased                     (125,190,490)    (126,928,129) 
Net decrease                             (9,659,129)        (565,336) 
</TABLE>
 


                                       17
<PAGE>
 
 
Federal tax information 
 


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 1996 will show the status of all 
distributions paid to your account in calendar 1995. 

                                       18
<PAGE>
 
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 
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 
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. 

 
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. 
 


                                       19
<PAGE>
 
PUTNAM INVESTMENTS 

The Putnam Funds 
One Post Office Square 
Boston, Massachusetts 02109 

Bulk Rate 
U.S. Postage 
PAID 
Putnam 
Investments 

 
20967-064 11/95 




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