<PAGE>
 
                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C.  20549

                                   FORM 10-Q

(MARK ONE)

   X    QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
 -----                                                                    
        EXCHANGE ACT OF 1934

        FOR THE QUARTERLY PERIOD ENDED JUNE 30, 1997

                                      OR

_____  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
       EXCHANGE ACT OF  1934

       For the transition period from________________ to________________
 
       Commission file number:  0-8176


                                                     SOUTHWEST WATER COMPANY
[LOGO OF SOUTHWEST WATER COMPANY]                 (EXACT NAME OF REGISTRANT AS  
                                                    SPECIFIED IN ITS CHARTER)


          DELAWARE                                      95-1840947
(STATE OR OTHER JURISDICTION OF                      (I.R.S. EMPLOYER
INCORPORATION OR ORGANIZATION)                      IDENTIFICATION NO.)



 225 NORTH BARRANCA AVENUE, SUITE 200
      WEST COVINA, CALIFORNIA                           91791-1605
(ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)                (ZIP CODE)


                                (626) 915-1551
             (REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE)

     Indicate by check mark whether the Registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
Registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.  Yes  X    No ___
                                               ---         

     Indicate the number of shares outstanding of each of the issuer's classes
of common stock, as of the latest practicable date.  On August 8, 1997, there
were 3,145,029 common shares outstanding.
<PAGE>
 
                   SOUTHWEST WATER COMPANY AND SUBSIDIARIES

                                     INDEX
<TABLE> 
<CAPTION> 
                                                                                       Page No.              
                                                                                       --------              
<S>                                                                                      <C>                 
Part I.        Financial Information:                                                                        
-------        ----------------------                                                                        
                                                                                                             
Item 1.        Financial Statements:                                                                         
                                                                                                             
               Condensed Consolidated Balance Sheets -                                                       
               June 30, 1997 and December 31, 1996                                        3                  
                                                                                                             
               Condensed Consolidated Statements of Income -                                                 
               Three and six months ended June 30, 1997 and 1996                          4                  
                                                                                                             
               Condensed Consolidated Statements of Cash Flows -                                             
               Six months ended June 30, 1997 and 1996                                    5                  
                                                                                                             
               Notes to Condensed Consolidated Financial Statements                   6 - 7                  
                                                                                                             
Item 2.        Management's Discussion and Analysis of                                                       
               Financial Condition and Results of Operations                         7 - 11                  
                                                                                                             
Part II.       Other Information:                                                                            
--------       ------------------                                                                            
                                                                                                             
Item 1.        Legal Proceedings                                                         12                  
                                                                                                             
Item 4.        Submission of Matters to a Vote of Security Holders                       13                  
                                                                                                             
Item 6.        Exhibits and Reports on Form 8-K                                          13                  
                                                                                                             
               Signatures                                                                14                   
</TABLE>

                                       2
<PAGE>
 
         PART I.  FINANCIAL INFORMATION
         ITEM 1.  FINANCIAL STATEMENTS

         SOUTHWEST WATER COMPANY AND SUBSIDIARIES
         CONDENSED CONSOLIDATED BALANCE SHEETS
<TABLE> 
<CAPTION> 
                                                                               June 30,                December 31,
                                                                                1997                      1996
                                                                             ----------                ------------
                                                                             (Unaudited)
                                                                                        (In thousands)
         <S>                                                                 <C>                       <C>
         ASSETS
         Current Assets:
                  Cash and cash equivalents                                  $    505                   $    790
                  Customers' accounts receivable, net                           9,506                      8,216
                  Other current assets                                          3,019                      2,086
                                                                             --------                   --------
                                                                               13,030                     11,092
         Property, Plant and Equipment:
                  Utility property, plant and equipment - at cost             127,791                    119,731
                  Contract operations property, plant and 
                   equipment - at cost                                          6,608                      6,448
                                                                             --------                   --------
                                                                              134,399                    126,179
                  Less accumulated depreciation and amortization               36,621                     34,765
                                                                             --------                   --------
                                                                               97,778                     91,414
         Other Assets                                                           8,734                      8,910
                                                                             --------                   --------
                                                                             $119,542                   $111,416
                                                                             =========                  ========
         LIABILITIES AND STOCKHOLDERS' EQUITY

         Current Liabilities:
                  Current portion of long-term debt and bank notes payable   $  7,120                   $  6,089
                  Accounts payable                                              1,593                      1,513
                  Other current liabilities                                     9,578                      7,569
                                                                             --------                   --------
                                                                               18,291                     15,171
         Other Liabilities and Deferred Credits:
                  Long-term debt                                               30,700                     30,700
                  Advances for construction                                     7,533                      7,719
                  Contributions in aid of construction                         25,645                     21,556
                  Deferred income taxes                                         3,990                      3,398
                  Other liabilities and deferred credits                        2,473                      2,472
                                                                             --------                   --------
         Total Liabilities and Deferred Credits                                88,632                     81,016

         Stockholders' Equity:
                  Cumulative preferred stock                                      517                        517
                  Common stock                                                     31                         31
                  Paid-in capital                                              26,364                     26,159
                  Retained earnings                                             4,022                      3,728
                  Unamortized value of restricted stock issued                    (24)                       (35)
                                                                             --------                   --------
         Total Stockholders' Equity                                            30,910                     30,400
                                                                             --------                   --------
                                                                             $119,542                   $111,416
                                                                             ========                   ========
</TABLE> 

         See accompanying notes to condensed consolidated financial statements.

                                       3

<PAGE>
 
                   SOUTHWEST WATER COMPANY AND SUBSIDIARIES
                  CONDENSED CONSOLIDATED STATEMENTS OF INCOME
                                           
                                  (Unaudited)

<TABLE> 
<CAPTION>   
                                                       Three Months Ended                  Six Months Ended        
                                                           June 30,                           June 30,             
                                                  ---------------------------         ---------------------------  
                                                     1997              1996              1997              1996                   
                                                  ---------         ---------         ---------         ---------                
                                                                   (In thousands except per share amounts)                       
<S>                                                <C>               <C>               <C>               <C>       
Operating Revenues                                 $18,469           $17,438           $33,901           $31,427                 
                                                                                                                                 
Operating Expenses:                                                                                                              
Direct operating expenses                           13,480            13,155            25,430            24,430                 
Selling, general and administrative                  2,885             2,670             5,563             4,981    
                                                   -------           -------           -------           -------                
                                                    16,365            15,825            30,993            29,411    
                                                   -------           -------           -------           -------                
Operating Income                                     2,104             1,613             2,908             2,016   
Other Income (Expense):                                                                                            
Interest expense                                      (808)             (695)           (1,590)           (1,354)                
Interest income                                         30                16                63                47   
Other                                                   66                37               121                47   
                                                   -------           -------           -------           -------                
                                                      (712)             (642)           (1,406)           (1,260)  
                                                   -------           -------           -------           -------                
Income Before Income Taxes                           1,392               971             1,502               756   
Income tax provision                                   585               408               631               318   
                                                   -------           -------           -------           -------                
Net Income                                             807               563               871               438   
Dividends on preferred shares                           (7)               (7)              (14)              (14)                
                                                   -------           -------           -------           -------                
Net Income Available for Common Shares             $   800           $   556           $   857           $   424                 
                                                   =======           =======           =======           =======                
Earnings Per Common Share (Note 8)                 $  0.25           $  0.18           $  0.27           $  0.14   
                                                   =======           =======           =======           =======                
Cash Dividends Per Common Share (Note 8)           $  0.09           $ 0.083           $  0.18           $ 0.166                 
                                                    ======            ======           =======           =======                
Weighted Average Outstanding                                                                                                     
     Common Shares (Note 8)                          3,138             3,108             3,133             3,103   
                                                   =======           =======           =======           =======    
</TABLE> 

    See accompanying notes to condensed consolidated financial statements.


                                      4 
<PAGE>
 
                   SOUTHWEST WATER COMPANY AND SUBSIDIARIES
                CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
                                  (Unaudited)

<TABLE> 
<CAPTION> 
                                                                           Six Months Ended      
                                                                                June 30,         
                                                                      -------------------------- 
                                                                        1997              1996   
                                                                      --------          -------- 
                                                                          (In thousands)         
<S>                                                                   <C>               <C>      
                                                                                                 
CASH FLOWS FROM OPERATING ACTIVITIES, NET                              $3,171            $  428  
                                                                                                 
CASH FLOWS FROM INVESTING ACTIVITIES:                                                            
                                                                                                 
         Additions to property, plant and equipment                    (4,624)           (5,598) 
         Investment in Windermere Utility Company                           -            (2,300) 
                                                                      -------           -------  
         Net cash used in investing activities                         (4,624)           (7,898) 
                                                                                                 
CASH FLOWS FROM FINANCING ACTIVITIES:                                                            
                                                                                                 
         Net borrowings of short-term debt                              1,031             7,320  
         Contributions in aid of construction                             693               784  
         Net proceeds from dividend reinvestment and                                             
             employee stock purchase plans                                184               130  
         Dividends paid                                                  (576)             (519) 
         Payments of advances for construction                           (164)             (192) 
                                                                      -------           -------  
                                                                                                 
         Net cash provided by financing activities                      1,168             7,523  
                                                                      -------           -------  
                                                                                                 
Net increase (decrease) in cash and cash equivalents                     (285)               53  
                                                                                                 
Cash and cash equivalents at beginning of year                            790               784  
                                                                      -------            ------  
                                                                                                 
Cash and cash equivalents at end of period                            $   505            $  837  
                                                                      =======            ======  
                                                                                                 
Supplemental Disclosure of Cash Flow Information:                                                
                                                                                                 
         Cash paid during the period for:                                                        
              Interest                                                 $1,555            $1,318  
              Income taxes                                             $  284            $  462  
         Depreciation and amortization                                 $2,089            $1,943  
         Non-cash contributions in aid of construction                                           
              conveyed to Company by developers                        $3,966            $1,197   

</TABLE> 

    See accompanying notes to condensed consolidated financial statements.

                                       5


<PAGE>
 
                    SOUTHWEST WATER COMPANY AND SUBSIDIARIES
              NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
                                 June 30, 1997
                                  (Unaudited)

1.   Southwest Water Company ("the Company") and its subsidiaries provide water
     management services through contract and utility operations.  The unaudited
     consolidated condensed financial statements reflect all adjustments which,
     in the opinion of management, are necessary to present fairly the financial
     position of the Company as of June 30, 1997, and the Company's results of
     operations for the three and six months ended June 30, 1997.  All such
     adjustments are of a normal recurring nature.  Certain reclassifications
     have been made to the 1996 financial statements to conform to the 1997
     presentation.

2.   Certain information and footnote disclosures normally included in financial
     statements prepared in accordance with generally accepted accounting
     principles have been condensed or omitted pursuant to the rules and
     regulations of the Securities and Exchange Commission.  These condensed
     consolidated financial statements should be read in conjunction with the
     financial statements and related notes contained in the Company's Annual
     Report on Form 10-K for the year ended December 31, 1996.

3.   There is seasonality to the water management services industry; thus, the
     results of operations for the three and six months ended June 30, 1997 are
     not necessarily indicative of the results to be expected for the full year.
     The first and fourth quarters of each year are normally the lowest in terms
     of average customer water usage for the Company's water utilities.
     Rainfall and weather conditions affect utility operations, and utility
     revenues usually peak during the second and third quarters of each year.
     The Company's contract operations business can also be seasonal in nature.
     Heavy rainfall during a quarter hampers the Company's ability to perform
     billable work such as pipeline maintenance, manhole rehabilitation and
     other outdoor services.

4.   For the three and six months ended June 30, 1997 and 1996, earnings per
     common share were calculated using the weighted average number of common
     shares and dilutive common equivalent shares outstanding during the period.
     Common equivalent shares arise from stock options, but since common stock
     equivalents do not exceed 3% of weighted average common shares outstanding,
     primary and fully diluted earnings are not reported separately.

5.   The Company will be subject to Statement of Financial Accounting Standards
     No. 128 "Earnings Per Share" ("SFAS No. 128") for interim and annual
     financial statements issued after December 15, 1997.  SFAS No. 128 changes
     the standards for computing earnings per share ("EPS") by replacing the
     presentation of primary EPS with a presentation of basic EPS.  Diluted EPS
     will replace fully diluted EPS and will reflect the potential dilution that
     could occur if common stock equivalents were exercised or converted into
     common stock that could share in the earnings of the entity.  SFAS No. 128
     requires a dual presentation of basic and diluted EPS by entities with
     complex capital structures.  Management does not expect that SFAS No. 128
     will materially impact the Company's financial position or results of
     operations.

6.   The Company will also be subject to Statement of Financial Accounting
     Standards No. 130 "Reporting Comprehensive Income" ("SFAS No.130") for
     interim and annual financial statements issued for periods beginning after
     December 15, 1997.  SFAS No. 130 establishes standards for the reporting
     and display of comprehensive income and its components.  Comprehensive
     income is defined as revenue, expenses, gains and losses that under
     generally accepted accounting principles are excluded from net income (such
     as extraordinary and non-recurring gains and losses). SFAS No. 130 requires
     that items of  comprehensive income be classified separately in the
     financial statements.  The statement also requires that the accumulated
     balance of comprehensive income 

                                       6
<PAGE>
 
     items be reported separately from retained earnings and paid-in capital in
     the equity section of the balance sheet. Management does not expect that
     the implementation of SFAS No. 130 will have a material effect on the
     Company's financial position or results of operations.

7.   The Company will be subject to Statement of Financial Accounting Standards
     No. 131, "Disclosures about Segments of an Enterprise and Related
     Information" ("SFAS No. 131") for annual financial statements issued for
     periods beginning after December 15, 1997.  SFAS No. 131 is not required in
     interim financial statements in the initial year of application.  SFAS No.
     131 requires that financial and descriptive information about operating
     segments of a company be provided.  Generally, financial information will
     need to be reported on the same basis that it is used internally for
     evaluating segment performance and deciding how to allocate resources to
     segments.   SFAS No. 131 will require additional financial disclosure by
     the Company, but will not have any effect on the Company's financial
     position or results of operations.

8.   The 1996 earnings per common share, cash dividends per common share and
     weighted average outstanding common shares have been restated to reflect a
     20% stock dividend granted to stockholders of record on January 2, 1997.

9.   As discussed in the Company's 1996 Annual Report on Form 10-K, the Company
     was approached by the City of Albuquerque ("the City") during the first
     quarter of 1997 concerning the potential sale of New Mexico Utilities, Inc.
     ("NMUI") to the City.  Under New Mexico state law, municipalities have the
     right to acquire private water utility plants and systems within their
     territorial limits by condemnation, but must pay fair value if the election
     to proceed with a condemnation is made. During the second quarter of 1997,
     the City and NMUI hired independent third parties to perform separate
     appraisals of NMUI.  Three separate appraisals have been completed with
     values ranging from $22,000,000 to $39,000,000.   Discussions with the City
     are continuing; however, at this time, management cannot predict whether an
     agreement for the sale of NMUI is likely, whether the City will continue to
     pursue an agreement to purchase NMUI, or whether the City will elect to
     proceed with condemnation if an agreement is not reached.  Therefore,
     management cannot predict a price that the City would pay if it maintains
     its interest in concluding the transaction.

                 ITEM 2.  MANAGEMENT'S DISCUSSION AND ANALYSIS
                OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

LIQUIDITY AND CAPITAL RESOURCES:

  Liquidity and capital resources of the Company are influenced primarily by
construction expenditures at Suburban Water Systems ("Suburban")  for the
replacement and renovation of existing water utility facilities and by
construction expenditures for new water and wastewater utility facilities at
NMUI.  To a lesser extent, liquidity may also be influenced by the Company's
continuing investment in ECO Resources, Inc. ("ECO").

  At June 30, 1997, the Company had cash and cash equivalent balances totaling
$505,000.  The Company has three separate lines of credit from different
commercial banks.  As of June 30, 1997, the Company had a total line of credit
capacity of $16,000,000, and unused lines of credit of $9,780,000.  The amount
of additional borrowing capacity available under current short-term lines of
credit is limited by financial covenants that restricted additional borrowing at
June 30, 1997 to a maximum of $3,992,000.  Two of the lines of credit expire
during 1997.  The banks have notified the Company that they want to renew the
lines of credit and the lines are currently being renegotiated. The
other line of credit expires in 1998 and is expected to be renewed in the normal
course of business.  During the first six months of 1997, the Company borrowed a
net amount of $1,031,000 on its lines of credit, primarily to fund construction
expenditures at its utility operations.

                                       7
<PAGE>
 
  In 1996, the Company completed a long-term First Mortgage Bond financing for
$12,000,000. Among other financial covenants, the First Mortgage Bond Indentures
limit the amount of utility property that may be pledged for additional secured
borrowings. At June 30, 1997, the additional secured borrowing capacity under
these indentures was approximately $27,021,000.

  During the second quarter of 1997, the Company's additions to property, plant
and equipment were $8,590,000, representing an increase of $1,795,000 over the
same period in 1996.  Developers made contributions in aid of construction
("CIAC") totaling $4,659,000, of which $3,966,000 was non-cash CIAC and the
remaining $693,000 was received as cash.  The Company financed capital additions
of $3,931,000 which were funded by cash flows from operations and short-term
borrowing.  Capital expenditures at NMUI are expected to decrease approximately
$2,000,000 over the next 12 months due to the completion of major projects in
1997. Suburban's capital expenditures are expected to continue at the same level
over the next 12 months due to the construction of additional new plant and the
refurbishment of existing utility plant.

  The Company anticipates that the available short-term borrowing capacity and
the cash flow generated from operations will be sufficient to fund its
activities for the next year.  If additional cash were needed to fund
improvements or to acquire additional assets, the Company would consider
alternative sources, including long-term financing.  The amount and timing of
any future long-term financing will depend on various factors, including the
timeliness and adequacy of rate increases, the availability of capital, and the
Company's ability to meet interest and fixed charge coverage requirements.
Regulatory approval is required for any long-term financing by Suburban and
NMUI.  If the Company were unable to renew its existing lines of credit or
obtain additional long-term financing, capital spending would be reduced or
delayed until new arrangements were secured.  Such financing arrangements could
include seeking equity financing through a private placement or a public
offering.

REGULATORY AFFAIRS:

  Regulation:

  The rates and operations of the Company's utilities are regulated by the
California Public Utilities Commission ("CPUC") and the New Mexico Public
Utility Commission ("NMPUC").  The rates allowed are intended to provide the
utilities an opportunity to earn a reasonable return on common equity and to
fund necessary investments in property, plant and equipment. The Company
anticipates that continuing construction expenditures and increased direct
operating expenses will require periodic requests for rate increases.
 
  Suburban received CPUC approval for a 4.25% ($1,100,000) general rate
increase, effective April 24, 1996, as well as a 2.62% ($705,000) step increase,
effective January 1, 1997.  Suburban is authorized to file for an additional
step increase of 2.62% ($740,000) which, if approved, would become effective
January 1, 1998.

                                       8
<PAGE>
 
  Tax Legislation:

  In 1996, the California legislature enacted Senate Bill 1099, which became
effective January 1, 1997. This legislation provides that water utilities which
sold excess property and reinvested the sale proceeds within an eight-year
period in the utility's plant do not need to allocate any portion of a gain on
sale to the ratepayers.  From 1990 through 1995, Suburban recorded pretax gains
on land sales of four parcels of excess real property totaling $1,690,000.
Since the proceeds of the four land sales were reinvested in utility plant, the
gains should not be subject to allocation to the ratepayers.

  In 1996, legislation was enacted that changed the federal tax treatment of
CIAC.  This legislation repealed the requirement to include CIAC as a component
of taxable income, eliminating the requirement for the Company to pay taxes on
CIAC as it is received.  The new legislation also eliminates the depreciation
deduction for CIAC, and sets forth new requirements for the depreciation method
and useful life to be used for most non-CIAC water utility property.  The law
was effective for CIAC received after June 12, 1996.

  The net impact of the repeal of the income tax on CIAC, combined with the
changes in depreciation calculations, is expected to favorably impact NMUI's
cash flow, since significant amounts of CIAC are expected in its fast-growing
service area.  The impact on Suburban's earnings is not expected to be
significant; however, future cash flow could be negatively affected by the
change in depreciation methods since Suburban does not anticipate high levels of
CIAC.  Until the Internal Revenue Service completes final regulations, and until
California and New Mexico complete changes, if any, to their tax regulations,
the full impact of this tax change cannot be determined.  The Company does not
believe that these tax law changes will have a material adverse impact on its
ability to fund ongoing operations and capital needs.

  Regulatory Developments:

  The California legislature has held hearings discussing the CPUC's
organization and operation.  Among other options, the CPUC has proposed
consideration of performance-based rate making, which would provide incentives
for utilities to operate more efficiently and improve productivity.  If enacted,
these changes are expected to reduce regulatory burden and promote efficiency
among utilities which, if accomplished, would likely benefit both ratepayers and
stockholders.  Legislative and CPUC developments are closely monitored by the
Company and by the various water industry associations in which the Company
actively participates.  Whether such legislative or CPUC changes will be
enacted, or, if enacted, what the terms of such changes would be, are not known
by the Company.  Therefore, management cannot predict the impact of final
legislative or CPUC developments on the Company's financial condition or results
of operations.

  In 1996, the residents of the state of New Mexico voted to combine the NMPUC
and the New Mexico Corporation Commission ("NMCC") and create the New Mexico
Public Regulatory Commission ("NMPRC"). Presently, the NMPUC consists of three
appointed officials and the NMCC consists of three elected officials. Under the
newly enacted legislation, the NMPRC will consist of five elected officials who
will be elected in November 1998, and take office on January 1, 1999.

  The voters of the state of New Mexico also passed a constitutional amendment
which will require the state legislature to make changes to the Public Utilities
Act ("PUA") that  may result in changes to the present process of ratemaking.  A
legislative committee is currently reviewing the proposed changes to the PUA.
Management cannot predict if or when changes will ultimately occur; or if
changes were enacted, the impact on NMUI's financial position or results of
operations.

  Contract Operations:

  The operations of ECO are not subject to regulation by a public utilities
commission.  ECO's long-term water and wastewater service contracts typically
include annual inflation adjustments.  Most contracts with municipal utility
districts are short-term contracts and do not generally include inflation
adjustments. Changes in prices are negotiated on a contract-by-contract basis.

ENVIRONMENTAL AFFAIRS:

  The Company's operations are subject to water and wastewater pollution
prevention standards and water and wastewater quality regulations of the United
States Environmental Protection Agency (the "EPA") and various state regulatory
agencies.  The EPA and state regulatory agencies continue to promulgate new
regulations mandated by the Federal Water Pollution Control Act, the Safe
Drinking Water Act (as reenacted in 1996), and the Resource Conservation and
Recovery Act.  Both the EPA and state regulatory agencies require periodic
testing and sampling of water.  To date, the Company has not experienced any
material adverse effects upon its operations resulting from compliance with
governmental regulations.

                                       9
<PAGE>
 
  During the second quarter of 1997, Suburban was advised by the San Gabriel
Basin Water Quality Authority that the California Department of Health Services
("CDHS") was monitoring groundwater sources for the contaminant  "perchlorate",
which had been detected in the Main San Gabriel Valley Upper Basin. In June
1997, the contaminant was detected in a well that is operated but not owned by
Suburban, at a level in excess of the state's allowable standards.  Suburban has
been able to blend water produced from this well with other water sources,
bringing the concentration within the CDHS standards.  The impact of this
contaminant on the results of operations for Suburban is not fully known at the
time; however, costs associated with testing of Suburban's water supplies have
increased and are expected to increase further as regulatory agencies adopt
additional monitoring requirements.  Suburban believes that these costs will be
recoverable from ratepayers in future rate increases; however, there is no
assurance that recovery of these costs will be allowed.

  The Company believes that future incremental costs of complying with
governmental regulations, including capital expenditures, if any, will be
recoverable through increased rates and contract operations revenues.  However,
there is no assurance that recovery of such costs will be allowed.

RESULTS OF OPERATIONS:

THREE MONTHS ENDED JUNE 30, 1997 COMPARED TO THREE MONTHS ENDED JUNE 30, 1996

  Earnings per common share were $.25 in 1997, compared to $.18 (adjusted for a
stock dividend of 20% on January 2, 1997) during the same period in 1996.

  Operating income increased $491,000 or 30%, and, as a percentage of operating
revenues, increased from 9% in 1996 to 11% in 1997. Operating income at the
utilities increased $304,000, due primarily to increased water sales at Suburban
and the positive effects of water rate increases. ECO's operating results
improved $83,000, due to increased revenue from new contracts, additional work
performed outside the scope of existing contracts, aggressive cost containment
measures, and restructuring of marketing responsibilities and focus. Parent
company expenses decreased $104,000, due primarily to a reduction in corporate
reserve expenses in comparison to 1996 levels.

  Operating revenues

  Operating revenues increased $1,031,000 or 6%.  Water utility revenues
increased $604,000 due to warmer weather in Southern California which led to a
6.3% increase in water consumption by Suburban's customers. Suburban's rate
increases also favorably impacted operating revenue.  ECO's revenues increased
$427,000, primarily as a result of new contracts and additional work performed
outside the scope of existing contracts.

  Direct operating expenses

  Direct operating expenses increased $325,000 or 2%.  As a percentage of
operating revenues, these expenses decreased from 75% in 1996 to 73% in 1997.
Water utility direct operating expenses increased $122,000, primarily reflecting
the increase in water costs experienced to meet increased consumption by
Suburban's customers.  ECO's direct operating expenses increased $203,000,
resulting primarily from higher expenses associated with new contracts and
additional work performed outside the scope of existing contracts.

  Selling, general and administrative

  Selling, general and administrative expenses increased $215,000 or 8%.  As a
percentage of operating revenues, these expenses increased from 15% in 1996 to
16% in 1997.  General and administrative expenses at the utilities increased
$178,000, primarily due to an increase in legal reserves at Suburban. 

                                       10
<PAGE>
 
ECO's selling, general and administrative expenses increased $141,000, primarily
due to higher insurance, legal and consulting expenses. As discussed above,
general and administrative expenses of the parent company decreased $104,000.

  Other income and interest expense

  Interest expense increased $113,000, due primarily to higher short-term and
long-term credit balances in 1997 as compared with 1996.  Other income increased
$29,000, due primarily to consulting fees received as a result of an investment
in Windermere Utility Company ("Windermere").

SIX MONTHS ENDED JUNE 30, 1997 COMPARED TO SIX MONTHS ENDED JUNE 30, 1996

  Earnings per common share increased from $.14 (adjusted for a stock dividend
of 20% on January 2, 1997) in 1996 to $.27 in 1997.
 
  Operating income increased $892,000, or 44%, and, as a percentage of operating
revenues, increased from 6% in 1996 to 9% in 1997.  Operating income at the
utilities increased $850,000, due primarily to increased water consumption at
Suburban and the positive effects of water rate increases.  ECO's operating loss
decreased $124,000 due to increased revenues from new contracts, additional work
performed outside the scope of existing contracts, aggressive cost containment
measures, and restructuring of marketing responsibilities and focus.  Parent
company expenses increased $82,000 primarily due to increases in payroll and
associated payroll benefits, and increases in outside services.

  Operating revenues

  Operating revenues increased $2,474,000 or 8%.  Water utility sales increased
$1,437,000 due to warmer weather in Southern California resulting in an 8.4%
increase in water consumption by Suburban's customers.  Water rate increases at
Suburban also favorably impacted operating revenues.  ECO's revenues increased
$1,037,000, primarily as a result of revenues from new contracts and additional
work performed outside the scope of existing contracts.

  Direct operating expenses

  Direct operating expenses increased $1,000,000 or 4%.  As a percentage of
operating revenues, these expenses decreased from 78% in 1996 to 75% in 1997.
Water utility direct operating expenses increased $373,000, which reflects the
corresponding increase in water consumption by Suburban's customers. ECO's
operating results improved $83,000, due to new contracts, additional work
performed outside the scope of existing contracts,  aggressive cost containment
measures, and restructuring of marketing responsibilities and focus. ECO's
direct operating expenses increased $627,000, resulting primarily from higher
expenses associated with new contracts and increased billable work.

  Selling, general and administrative

  Selling, general and administrative expenses increased $582,000 or 12%.  As a
percentage of operating revenues, these expenses were 16% in 1997 and 1996.
Selling, general and administrative expenses at the utilities increased $214,000
primarily due to increased legal reserves.  ECO's selling, general and
administrative expenses increased $286,000 primarily due to higher insurance,
legal and consulting expenses.  As discussed above, general and administrative
expenses of the parent company increased $82,000.

  Other income and Interest expense

  Interest expense increased $236,000, primarily due to higher total short-term
and long-term credit balances in 1997 as compared with 1996.  Other income
increased $74,000, primarily due to consulting fees received as a result of an
investment in Windermere.

                                       11
<PAGE>
 
                          PART II - OTHER INFORMATION
                           ITEM 1.  LEGAL PROCEEDINGS

  On July 29, 1997, an action entitled Kristin Santamaria, et al. vs. Suburban
Water Systems, etc. et al., was filed as Case No. KC025995 in the Superior Court
for the County of Los Angeles, California.  The plaintiffs in the action are
approximately 85 individuals who allege that they are residents in the San
Gabriel Valley (the "Valley"), a portion of Los Angeles County, California.  The
defendants in the action consist of the Company, Suburban and three other water
purveyors that provide water service in the Valley and 19 other entities
operating in the Valley which manufacture a variety of products.

  The plaintiffs contend, in essence, that they are long-time residents of the
Valley and that, by virtue of their residence in the Valley, they have suffered
long-term exposure to various hazardous substances, including, but not limited
to, trichloroethylene ("TCE"), perchloroethene ("PCE"), carbon tetrachloride
("CTC") and perchlorate. The plaintiffs allege that they have suffered physical
and mental injury, six wrongful deaths, loss of income,  medical expenses, loss
of future earnings, loss of property values, and expenses for property testing
and remediation.  The plaintiffs contend that the defendants are liable for the
alleged losses of the plaintiffs either by virtue of release of these hazardous
materials into the soil, air and water in the Valley or by delivery of water
which contains these hazardous materials for domestic consumption.  The
plaintiffs allege 12 separate causes of action, including 10 causes of action
against the Company, Suburban and the other water purveyors, ranging from
negligence, wrongful death and strict liability to trespass, nuisance, absolute
liability and fraudulent concealment.  The plaintiffs seek general, special and
punitive damages in unspecified amounts as well as injunctive relief ordering a
cessation of the acts of which the plaintiffs complain.
 
  The Company and Suburban have not been served with the summons and complaint
in the action, and the Company understands that the attorneys for the plaintiffs
are currently seeking more plaintiffs to join in the action.  Accordingly, no
response to the complaint is due from the Company or Suburban at this time.

  Suburban annually takes over 4,000 water samples from reservoirs, wells and
residences, which are then tested by independent, state-certified laboratories.
Water tested by these laboratories has continued to comply with all state and
Federal drinking water standards.  The Company does not provide any water
service.  The Company and Suburban will vigorously defend against all claims
made by the plaintiffs and believe they are not liable for any damages to the
plaintiffs.

  Suburban, the Company, and several unrelated parties were served with a
complaint in September 1995, wherein the plaintiff claimed that while working in
the 1950's and 1960's for an independent contractor hired by Suburban, he was
exposed to asbestos fibers.  As a result of such exposure, he contracted
mesothelioma.  Suburban and the Company denied all allegations in their response
to the complaint.  The plaintiff died In 1995, and in 1996 the plaintiff's widow
and children filed a wrongful death action against Suburban and the Company.
This complaint alleges the same facts as the first complaint, plus the wrongful
death of the original plaintiff.  The two actions have been consolidated.

  Information concerning the claims made by the plaintiffs, the efforts of the
Company and Suburban to cause their insurance carrier to provide indemnity and
defense in the action, and information concerning other defendants in the action
is set forth in the Company's Form 10-Q Report for the quarter ended March 31,
1997 and is hereby incorporated by reference.   To date, there has been no
specific claim for damages by the plaintiffs.  Suburban and the Company maintain
that they have no responsibility for the death of the original plaintiff and
intend to contest these claims vigorously.

  The Company and its subsidiaries are the subject of certain litigation arising
from the ordinary course of operations.  The Company believes the ultimate
resolution of such matters will not materially affect its consolidated financial
condition, results of operations or cash flow.

                                       12
<PAGE>
 
          ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS
                                        
  At the Annual Meeting of Stockholders held on May 22, 1997, all of the members
of the Board of Directors were re-elected by the following votes:

<TABLE>
<CAPTION>
Name of Director           Votes For   Votes Withheld
----------------           ---------   --------------
<S>                        <C>         <C>
H. Frederick Christie      2,553,579          120,411
Michael J. Fasman          2,433,274          240,716
Anton C. Garnier           2,549,871          124,119
Monroe Harris              2,545,309          128,681
Donovan D. Huennekens      2,547,901          126,089
Richard Kelton             2,552,396          121,594
Richard G. Newman          2,552,786          121,204
</TABLE>

  The selection of KPMG Peat Marwick LLP as the Company's independent auditors
was ratified by the following vote: votes for - 2,636,723; votes against -
23,093; and votes abstaining - 14,174. No broker non-votes were recorded.

  Also, the second amendment to the Amended and Restated Stock Option and
Restricted Stock Plan was approved with the following votes: votes for -
1,747,219; votes against  - 227,541; votes abstaining -130,422; and broker non-
votes - 568,808.

                   ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K

(a)  Exhibits furnished pursuant to Item 601 of Regulation S-K:
 
     10.4E    Letter of Extension to Credit Agreement dated June 30, 1997,
              between Registrant and Wells Fargo Bank, filed herewith.

     10.10E   Fifth Amendment to Loan Agreement and Promissory Note dated June
              20, 1997, between New Mexico Utilities, Inc., and Sunwest Bank of
              Albuquerque, filed herewith.

     10.13A   Letter of Extension to Credit Agreement dated June 30, 1997,
              between Suburban Water Systems and Wells Fargo Bank, filed
              herewith.

     10.14A   First Amendment to Credit Agreement dated March 31, 1997, between
              Registrant and Mellon Bank, filed herewith.

     10.14B   Second Amendment to Credit Agreement dated June 17, 1997, between
              Registrant and Mellon Bank, filed herewith.

     27       Financial Data Schedule.

(b)  Reports on Form 8-K:

     There were no reports on Form 8-K filed for the three months ended June 30,
1997.

                                       13
<PAGE>
 
                                  SIGNATURES



Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned thereto duly authorized.



                                       SOUTHWEST WATER COMPANY
                                       -----------------------
                                       (Registrant)



Dated: August 8, 1997                  /s/ Peter J. Moerbeek
---------------------                 ----------------------
                                      PETER J. MOERBEEK, Vice President Finance
                                      and Chief Financial Officer


 

                                       14