an on the last day of each following quarter until the Maturity Date.” 2.  *Effectiveness of this Amendment.*    Bank must have received thefollowing items, in form and content acceptable to Bank, before this Amendment is effective and before Bank is required to extend any credit to Borrower as provided for by this Amendment.  (a)  *Amendment.*    This Amendment fully executed in a sufficient number of counterparts for distribution to Bank andBorrower.  (b)  *Authorizations.*    Evidence that theexecution, delivery and performance by Borrower and each guarantor or subordinating creditor of this Amendment and any instrument or agreement required under this Amendment have been duly authorized.  (c)  *Representations and Warranties.*    The representations and warranties set forthin the Credit Agreement must be true and correct.  3.  *Representations andWarranties.*    The Borrower represents and warrants as follows:  (a)  *Authority.*    The Borrower has the requisite corporate power and authority to execute and deliver this Amendment and to perform its obligations hereunder and under the Loan Documents (asamended or modified hereby) to which it is a party. The execution, delivery and performance by the Borrower of this Amendment and the performance by Borrower of each Loan Document (as amended or modified hereby) to which it is a party have been dulyapproved by all necessary corporate action of Borrower and no other corporate proceedings on the part of Borrower are necessary to consummate such transactions.  (b)  *Enforceability*.    This Amendment has been duly executed and delivered by the Borrower. This Amendment and eachLoan Document (as amended or modified hereby) is the legal, valid and binding obligation of Borrower, enforceable against Borrower in accordance with its terms, and is in full force and effect.  (c)  *Representations and Warranties.*    The representations and warranties contained in each Loan Document (otherthan any such representations or warranties that, by their terms, are specifically made as of a date other than the date hereof) are correct on and as of the date hereof as though made on and as of the date hereof.  (d)  *No Default.*    No event has occurred and is continuing that constitutes an Eventof Default.  4.  *Choice of Law.*    The validity of this Amendment, itsconstruction, interpretation and enforcement, the rights of the parties hereunder, shall be determined under, governed by, and construed in accordance with the internal laws of the State of California governing contracts only to be performed in thatState.  5.  *Counterparts.*    This Amendment may be executed in any number ofcounterparts and by different parties in separate counterparts, each of which when so executed and delivered, shall be deemed an original, and all of which, when taken together, shall 2 
 constitute one and the same instrument. Delivery of an executed counterpart of a signature page to thisAmendment by telefacsimile shall be effective as delivery of a manually executed counterpart of this Amendment or such Content  6.  *Due Execution.*    The execution, delivery and performance of this Amendment are within the power of Borrower, have been duly authorized by all necessary corporate action, have received allnecessary governmental approvals, if any, and do not contravene any law or any contractual restrictions binding on Borrower.  7.  *Reference to and Effect on the Loan Documents.* (a)  Upon and after the effectiveness of this Amendment, each reference in the Credit Agreement to “this Agreement”, “hereunder”, “hereof” or words of like import referring to the CreditAgreement, and each reference in the other Loan Documents to “the Credit Agreement”, “thereof” or words of like import referring to the Credit Agreement, shall mean and be a reference to the Credit Agreement as modified andamended hereby.  (b)  Except as specifically amended above, the Credit Agreement and allother Loan Documents, are and shall continue to be in full force and effect and are hereby in all respects ratified and confirmed and shall constitute the legal, valid, binding and enforceable obligations of Borrower to Bank.  (c)  The execution, delivery and effectiveness of this Amendment shall not, except as expresslyprovided herein, operate as a waiver of any right, power or remedy of Bank under any of the Loan Documents, nor constitute a waiver of any provision of any of the Loan Documents.  (d)  To the extent that any terms and conditions in any of the Loan Documents shall contradict or be in conflict with any terms or conditions ofthe Credit Agreement, after giving effect to this Amendment, such terms and conditions are hereby deemed modified or amended accordingly to reflect the terms and conditions of the Credit Agreement as modified or amended hereby.  8.  *Ratification.*    Borrower hereby restates, ratifies and reaffirms each and every termand condition set forth in the Credit Agreement, as amended hereby, and the Loan Documents effective as of the date hereof.  9.  *Estoppel*.    To induce Bank to enter into this Amendment and to continue to make advances to Borrower under the Credit Agreement, Borrower hereby acknowledges and agrees that, after givingeffect to this Amendment, as of the date hereof, there exists no Event of Default and no right of offset, defense, counterclaim or objection in favor of Borrower as against Bank with respect to the Obligations. 3 
 IN WITNESS WHEREOF, the parties have entered into this Amendment as of the datefirst above written.  **“Bank”** BANKOF AMERICA, N.A.    a national association   **“Borrower”** SOUTHWEST WATER COMPANY,    a Delaware CorporationBy: /s/    DEBORAH L. MILLER           By: /s/    THOMAS C.TEKULVE        **Name:****Title:** **Deborah L. Miller****Senior VicePresident**   **Name:****Title:** **Thomas C. Tekulve****VicePresident Finance**      By: /s/    PETER J.MOERBEEK              **Name:****Title:** **Peter J. Moerbeek****ChiefFinancial Officer**4 
 **FOURTH AMENDED AND RESTATED REVOLVING NOTE** $6,000,000 Costa Mesa, California  September 30, 2001  FOR VALUE RECEIVED, the undersigned SUBURBAN WATER SYSTEMS, a California corporation (“Borrower”) promises to pay to the order of BANK OF AMERICA, N.A. (“Bank”) at its office at 675 Anton Blvd., Costa Mesa,California, or at such other place as the holder hereof may designate, in lawful money of the United States of America and in immediately available funds, the principal sum of Six Million Dollars ($6,000,000), or so much thereof as may be advancedand be outstanding, with interest thereon, to be computed on each advance from the date of its disbursement (computed on the basis of a 360-day year and actual days elapsed, which results in more interest than if a 365-day year were used) at a rateper annum equal to the applicable IBOR Rate plus the Applicable Margin or Prime Rate plus the Applicable Margin. When interest is determined in relation to the Prime Rate, each change in the rate of interest hereunder shall become effective on theopening of business on the day specified in the public announcement of a change in Bank’s Prime Rate. With respect to each IBOR option selected hereunder, Bank is hereby authorized to note the date, principal amount, interest rate andapplicable IBOR Rate Term thereto and any payments made thereon on Bank’s books and records (either manually or by electronic entry) and/or on any schedule attached to this Note, which notations shall be prima facie evidence of the accuracy ofthe information noted. This Note amends, restates in its entirety, and replaces that certain Third Amended and Restated Revolving Note dated as of July 13, 2001 in the original amount of Nine Million Dollars ($9,000,000) made by Borrower payable tothe order of Bank, pursuant to that certain Credit Agreement (as defined in Section D below).  **A.    DEFINITIONS:** As used herein, the following terms shall have themeanings set forth after each:  1.  “Applicable Margin” means the followingamounts per annum, based upon the Leverage Ratio as set forth in the certificate received pursuant to Section 6.01 (a) (iv)(“Compliance Certificate”):  **Pricing Level**  **Leverage Ratio**  **Applicable Margin for****IBORRate loans**  **Applicable Margin for****PrimeRate loans**      **(in basis points per annum)**  **(in basis points per annum)**1  <1.50x  125.0 bps  (25) bps2  31.50x but <1.75x  150.0 bps  00 bps3  31.75x  200.0 bps  25 bps During the period from the date of this Note to the date on whichthe Bank receives the first Compliance Certificate after the date of this Note, the Applicable Margin shall be based on a pricing level 2 set forth in the above table. Thereafter, the Applicable Margin shall be in effect from the date the mostrecent Compliance Certificate is received by the Bank, provided however, that if the Borrower fails to timely deliver the next certificate, the Applicable Margin from the date such Compliance Certificate was due shall be that indicated for thepricing 5 
 level 3 set forth in the above table, and thereafter, the pricing level indicatedby such Compliance Certificate when received.  2.  “Business Day” means anyday except a Saturday, Sunday or any other day designated as a holiday under Federal or California statute or regulation, or for amounts bearing interest at an offshore rate, a Business Day is any day except a Saturday, Sunday or any other daydesignated as a holiday under Federal or California statute or regulation on which Bank is open for business in California and dealing in offshore dollars.  3.  “IBOR Rate Portion” means a portion of the principal amount outstanding under this Note which is bearing interest at a rate relatedto IBOR. No IBOR Rate Portion shall be less than Two Hundred Fifty Thousand Dollars ($250,000).  4.  “IBOR Rate Term” means a period commencing on a Business Day and continuing for no shorter than one (1) month and no longer than twelve (12) months, as designated by Borrower, during which all or a portion ofthe outstanding principal balance of this Note bears interest determined in relation to Bank’s IBOR; provided however, that no IBOR Rate Term shall extend beyond the scheduled maturity date hereof. The last day of the interest period will bedetermined by Bank using the offshore dollar inter-bank market. If any IBOR Rate Term would end on a day which is not a Business Day, then such IBOR Rate Term shall be extended to the next succeeding Business Day.  5.  “IBOR Rate” means the interest rate determined by the following formula, rounded upward, ifnecessary, to the nearest  1/100 of one percent. (All amounts in the calculation will be determined by Bank as ofthe first day of the interest period.)  IBOR Rate =                                IBOR BaseRate                                                        (1.00 - Reserve Percentage)   (a)  “IBOR Base Rate” means the interest rate at whichBank’s Grand Cayman Branch, Grand Cayman, British West Indies, would offer U.S. dollar deposits for the applicable interest period to other major banks in the offshore dollar inter-bank market.  (b)  “Reserve Percentage” means the total of the maximum reserve percentages for determining thereserves to be maintained by member banks of the Federal Reserve System for Eurocurrency Liabilities, as defined in Federal Reserve Board Regulation D, rounded upward to the nearest  1/100 of one percent. The percentage will be expressed as a decimal, and will include, but not be limited to, marginal, emergency, supplemental, special, andother reserve percentages.  6.  “Prime Rate” means the rate of interestpublicly announced from time to time by Bank in San Francisco, California, as its Prime Rate. The Prime Rate is set by Bank based on various factors, including Bank’s costs and desired return, general economic conditions and other factors, andis used as a reference point 6 
for pricing some loans. Bank may price loans to its customers at, above or below the Prime Rate.  **B.    INTEREST:** 1.  *Payment of Interest.*    Interest accrued on this Note shall be payable on the first day of each month, commencingNovember 1, 2001.  2.  *Selection of Interest RateOptions.*    At any time any portion of this Note bears interest determined in relation to Bank’s IBOR, it may be continued by Borrower at the end of the IBOR Rate Term applicable thereto so that all or a portion thereofbears interest determined in relation to the Prime Rate or in relation to Bank’s IBOR for a new IBOR Rate Term designated by Borrower. At any time any portion of this Note bears interest determined in relation to the Prime Rate, Borrower mayconvert all or a portion thereof so that it bears interest determined in relation to Bank’s IBOR for an IBOR Rate Term designated by Borrower. At the time each advance is requested hereunder or Borrower wishes to select the IBOR option for allor a portion of the outstanding principal balance hereof, and at the end of each IBOR Rate Term, Borrower shall give Bank notice specifying (a) the interest rate option selected by Borrower, (b) the principal amount subject thereto, and (c) if theIBOR option is selected, the length of the applicable IBOR Rate Term. Any such notice may be given by telephone so long as, with respect to each IBOR selection, such notice is given to Bank prior to 10:00 a.m., California time, on the first day ofthe IBOR Rate Term. For each IBOR option requested hereunder, Bank will quote the applicable IBOR Rate to Borrower at approximately 10:00 a.m., California time, on the first day of the IBOR Rate Term. If Borrower does not immediately accept the ratequoted by Bank, any subsequent acceptance by Borrower shall be subject to a re-determination by Bank of the applicable IBOR Rate; provided however, that if Borrower fails to accept any such rate by 11:00 a.m., California time, on the Business Daysuch quotation is given, then the quoted rate shall expire and Bank shall have no obligation to permit a IBOR option to be selected on such day. If no specific designation of interest is made at the time any advance is requested hereunder or at theend of any IBOR Rate Term, Borrower shall be deemed to have made a Prime Rate interest selection for such advance or the principal amount to which such IBOR Rate Term applied.  3.  *Additional IBOR Provisions.* (a)  If Bank at any time shall determine that for any reason adequate and reasonable means do not exist for ascertaining Bank’s IBOR, then Bank shall promptly give notice thereof toBorrower. If such notice is given and until such notice has been withdrawn by Bank, than (i) no new IBOR option may be selected by Borrower, and (ii) any portion of the outstanding principal balance hereof which bears interest determined in relationto Bank’s IBOR, subsequent to the end of the IBOR Rate Term applicable thereto, shall bear interest determined in relation to the Prime Rate.  (b)  If any law, treaty, rule, regulation or determination of a court or governmental authority or any change therein or in the interpretation orapplication thereof (each, a “Change in Law”) shall make it unlawful for Bank (i) to make IBOR options available hereunder, or (ii) to maintain interest rates based on Bank’s IBOR, then in the former event, any obligation of Bank tomake available such unlawful IBOR options shall immediately be cancelled, and in the 7 
 latter event, any such unlawful IBOR-based interest rates then outstanding shallbe converted, at Bank’s option, so that interest on the portion of the outstanding principal balance subject thereto is determined in relation to the Prime Rate; provided however, that if any such Change in Law shall permit any IBOR-basedinterest rates to remain in effect until the expiration of the IBOR Rate Term applicable thereto, then such permitted IBOR-based interest rates shall continue in effect until the expiration of such IBOR Rate Term. Upon the occurrence of any of theforegoing events, Borrower shall pay to Bank immediately upon demand such amounts as may be necessary to compensate Bank for any fines, fees, charges, penalties or other costs incurred or payable by Bank as a result thereof and which areattributable to any IBOR options made available to Borrower hereunder, and any reasonable allocation made by Bank among its operations shall be conclusive and binding upon Borrower.  (c)  If any Change in Law or compliance by Bank with any request or directive (whether or not having the force of law) from any central bank orother governmental authority shall:  (i)  subject Bank to any tax, duty or other chargewith respect to any IBOR options, or change the basis of taxation of payments to Bank of principal, interest, fees or any other amount payable hereunder (except for changes in the rate of tax on the overall net income of Bank); or  (ii)  impose, modify or hold applicable any reserve, special deposit, compulsory loan or similarrequirement against assets held by, deposits or other liabilities in or for the account of advances or loans by, or any other acquisition of funds by any office of Bank; or  (iii)  impose on Bank any other condition;  and the result of any of the foregoing is to increase the cost to Bank of making, renewing or maintaining any IBOR options hereunder and/or to reduce any amount receivable by Bank in connectiontherewith, then in any such case, Borrower shall pay to Bank immediately upon demand such amounts as may be necessary to compensate Bank for any additional costs incurred by Bank and/or reductions in amounts received by Bank which are attributableto such IBOR options. In determining which costs incurred by Bank and/or reductions in amounts received by Bank are attributable to any IBOR options made available to Borrower hereunder, any reasonable allocation made by Bank among its operationsshall be conclusive and binding upon Borrower.  4.  *DefaultInterest.*    During the continuance of an Event of Default, the outstanding principal balance of this Note shall bear interest until paid in full at an increased rate per annum (computed on the basis of a 360-day year andactual days elapsed, which results in more interest than if a 365-day year were used) equal to two hundred basis points (200.0 bps) above the rate of interest from time to time applicable to this Note. 8 
 **C.    BORROWING AND REPAYMENT:** 1.  *Borrowing and Repayment.*    Borrower may from time to time during theterm of this Note borrow, partially or wholly repay its outstanding borrowings, and re-borrow, subject to all of the limitations, terms and conditions of this Note and of any document executed in connection with or governing this Note; providedhowever, that the total outstanding borrowings under this Note shall not at any time exceed the principal amount stated above. The unpaid principal balance of this obligation at any time shall be the total amounts advanced hereunder by the holderhereof less the amount of principal payments made hereon by or for Borrower, which balance may be endorsed hereon from time to time by the holder. The outstanding principal balance of this Note shall be due and payable in full on the “MaturityDate” (as defined in the Credit Agreement).  2.  *Advances.*    Advances hereunder, to the total amount of the principal sum stated above, may be made by the holder at the oral or written request of (a)                                            ,                                     ,                                                , any one acting alone, who are authorized to request advances and direct the disposition of any advances until written notice of the revocation of such authority is received by the holder at the officedesignated above, or (b) any person, with respect to advances deposited to the credit of any account of Borrower with the holder, which advances, when so deposited, shall be conclusively presumed to have been made to or for the benefit of Borrowerregardless of the fact that persons other than those authorized to request advances may have authority to draw against such account. The holder shall have no obligation to determine whether any person requesting an advance is or has been authorizedby Borrower.  3.  *Application of Payments.*    Each paymentmade on this Note shall be credited first, to any interest then due and second, to the outstanding principal balance hereof. Unless instructed otherwise by Borrower, all payments credited to principal shall be applied first, to the outstandingprincipal balance of this Note which bears interest determined in relation to the Prime Rate, if any, and second, to the outstanding principal balance of this Note which bears interest determined in relation to Bank’s IBOR, with such paymentsapplied to the oldest IBOR Rate Term first.  4.  *Prepayment.* (a)  *Prime Rate.*    Borrower may prepay principal on any portion of thisNote which bears interest determined in relation to the Prime Rate at any time, in any amount and without penalty.  (b)  *IBOR.*    Each prepayment of an IBOR Rate Portion, whether voluntary, by reason of acceleration or otherwise, will be accompanied by the amount of accrued interest on the amountprepaid, and a prepayment fee as described below. A “prepayment” is a payment of an amount on a date earlier than the scheduled payment date for such amount as required by this Agreement. The prepayment fee shall be equal to the amount (ifany) by which:  (i)  the additional interest which would have been payable during theinterest period on the amount prepaid had it not been prepaid, exceeds  (ii)  theinterest which would have been recoverable by Bank by placing the amount prepaid on deposit in the domestic certificate of deposit 9 
 market, the eurodollar deposit market, or other appropriate money marketselected by Bank for a period starting on the date on which it was prepaid and ending on the last day of the interest period for such Portion (or the scheduled payment date for the amount prepaid, if earlier).  Bank will have no obligation to accept an election of an IBOR Rate Portion if any of the following described events has occurred and iscontinuing:  (i)  Dollar deposits in the principal amount, and for periods equal to theIBOR Rate Term, of an IBOR Rate Portion are not available in the offshore dollar inter-bank market; or  (ii)  the IBOR Rate does not accurately reflect the cost of an IBOR Rate Portion.  Borrower acknowledges thatprepayment of such amount may result in Bank incurring additional costs, expenses and/or liabilities, and that it is difficult to ascertain the full extent of such costs, expenses and/or liabilities. Borrower, therefore, agrees to pay theabove-described prepayment fee and agrees that said amount represents a reasonable estimate of the prepayment costs, expenses and/or liabilities of Bank. If Borrower fails to pay any prepayment fee when due, the amount of such prepayment fee shallthereafter bear interest until paid at a rate per annum two percent (2%) above the Prime Rate in effect from time to time (computed on the basis of a 360-day year, actual days elapsed).  **D.    EVENTS OF DEFAULT:** This Note is made pursuant to and is subject to the terms and conditions of that certain Credit Agreement between Borrower and Bank dated as of July 30, 1999, as amended from time to time, including,without limitation, those terms relating to arbitration of Disputes (the “Credit Agreement”). Any default in the payment or performance of any obligation under this Note, or any defined event of default under the Credit Agreement, shallconstitute an “Event of Default” under this Note.  **E.    MISCELLANEOUS:** 1.  *Remedies.    *Upon the occurrence of any Event ofDefault, the holder of this Note, at the holder’s option, without notice upon the occurrence of an Event of Default pursuant to Section 7.01(g) of the Credit Agreement, and with notice upon the occurrence of any other Event of Default, maydeclare all sums of principal and interest outstanding hereunder to be immediately due and payable without presentment, demand, protest or notice of dishonor, all of which are expressly waived by Borrower, and the obligation, if any, of the holderto extend any further credit hereunder shall immediately cease and terminate. Borrower shall pay to the holder immediately upon demand the full amount of all payments, advances, charges, costs and expenses, including reasonable attorneys’ fees(to include outside counsel fees and all allocated costs of the holder’s in-house counsel), incurred by the holder in connection with the enforcement of the holder’s rights and/or the collection of any amounts which become due to theholder under this Note, and the prosecution or defense of any action in any way related to this Note, including without limitation, any action for declaratory relief, and including any of the foregoing incurred in connection with any bankruptcyproceeding relating to Borrower.  2.  *Obligations Joint andSeveral.*    Should more than one person or entity sign this Note as a Borrower, the obligations of each such Borrower shall be joint and several. 10 
 3.  *Governing Law.*    This Note shall begoverned by and construed in accordance with the laws of the State of California, except to the extent Bank has greater rights or remedies under Federal law, whether as a national bank or otherwise, in which case such choice of California law shallnot be deemed to deprive Bank of any such rights and remedies as may be available under Federal law.  4.  *Defined Terms.*    All capitalized terms not herein defined shall have the meanings given to them in the Credit Agreement.  “Borrower” SOUTHWEST WATER COMPANY,    a Delaware corporationBy: Title: By: Title: 11