As Filed with the Securities and Exchange Commission on June 28, 2000 SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K [X] ANNUAL REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 [FEE REQUIRED] For the fiscal year ended December 31, 1999 OR [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 [NO FEE REQUIRED] For the transition period from _____ to Commission file number 1-6659 ------ CONSUMERS WATER COMPANY EMPLOYEES' 401(k) SAVINGS PLAN AND TRUST PHILADELPHIA SUBURBAN CORPORATION 762 W. LANCASTER AVENUE BRYN MAWR, PA 19010

CONSUMERS WATER COMPANY EMPLOYEES' 401(k) SAVINGS PLAN AND TRUST The following audited financial statements are enclosed with this report: Financial Statements and Supplemental Schedules as of December 31, 1999 and 1998 Exhibit Page 23.1 Consent of KPMG LLP 4 99.1 Financial Statements and Supplemental Schedules as of December 31, 1999 and 1998 5

SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, Consumers Water Company has duly caused this annual report to be signed by the undersigned thereunto duly authorized. Consumers Water Company Employees' 401(K) Savings Plan and Trust Plan Sponsor: Date /s/ Roy H. Stahl 06/28/00 ----------------------------------- -------------------------- Roy H. Stahl Vice President Consumers Water Company

Exhibit 23.1 The Board of Directors Philadelphia Suburban Corporation We consent to incorporation by reference in the registration statement (No. 333-81085) on Form S-8 of Philadelphia Suburban Corporation of our report dated June 23, 2000, relating to the statements of net assets available for plan benefits of Consumers Water Company Employees' 401(k) Savings Plan and Trust as of December 31, 1999 and 1998, and the related statements of changes in net assets available for plan benefits for the years then ended, and all related supplemental schedules, which report appears in the December 31, 1999, annual report on Form 11-K of Philadelphia Suburban Corporation. /S/ KPMG LLP Philadelphia, Pennsylvania June 28, 2000

Exhibit 99.1 CONSUMERS WATER COMPANY EMPLOYEES' 401(k) SAVINGS PLAN AND TRUST Financial Statements and Supplemental Schedules December 31, 1999 and 1998 (With Independent Auditors' Reports Thereon)

CONSUMERS WATER COMPANY EMPLOYEES' 401(k) SAVINGS PLAN AND TRUST Table of Contents December 31, 1999 and 1998 Page Independent Auditors' Report 1 Financial Statements: Statements of Net Assets Available for Plan Benefits 2 Statements of Changes in Net Assets Available for Plan Benefits 3 Notes to Financial Statements 5 Schedule 1 - Schedule of Loans in Default 10 2 - Schedule of Assets Held for Investment Purposes at End of Year 11 3 - Schedule of Reportable Transactions 12

Independent Auditors' Report Consumers Water Company We have audited the accompanying statements of net assets available for plan benefits of Consumers Water Company Employees' 401(k) Savings Plan and Trust (the Plan) as of December 31, 1999 and 1998, and the related statements of changes in net assets available for plan benefits for the years then ended. These financial statements are the responsibility of the Plan's management. Our responsibility is to express an opinion on these financial statements based on our audits. We conducted our audits in accordance with generally accepted auditing standards. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion. In our opinion, the financial statements referred to above present fairly, in all material respects, the net assets available for plan benefits of the Plan as of December 31, 1999 and 1998, and the changes in net assets available for plan benefits for the years then ended, in conformity with generally accepted accounting principles. Our audits were performed for the purpose of forming an opinion on the basic financial statements taken as a whole. The supplemental schedules of loans in default, assets held for investment purposes and reportable transactions are presented for the purpose of additional analysis and are not a required part of the basic financial statements but are supplementary information required by the Department of Labor's Rules and Regulations for Reporting and Disclosure Under the Employee Retirement Income Security Act of 1974. These supplemental schedules are the responsibility of the Plan's management. The fund information in the statements of changes in net assets available for plan benefits is presented for purposes of additional analysis rather than to present the changes in net assets available for plan benefits of each fund. The supplemental schedules and fund information have been subjected to the auditing procedures applied in the audits of the basic financial statements and, in our opinion, are fairly stated in all material respects in relation to the basic financial statements taken as a whole. /S/ KPMG LLP Philadelphia, Pennsylvania June 23, 2000 1

CONSUMERS WATER COMPANY EMPLOYEES' 401 (k) SAVINGS PLAN AND TRUST Statements of Net Assets Available for Plan Benefits December 31, 1999 and 1998 1999 1998 ---- ---- Investments at fair value- Participant directed investments $16,938,763 $15,788,317 Employer common stock 7,224,170 7,652,110 Loans due from participants 1,170,174 1,025,271 ----------- ----------- Total Investments $25,333,107 $24,465,698 Cash and cash equivalents 1,871 14,534 Receivables- Employer contributions 319,908 328,959 Participants' contributions 26,924 116,314 Accrued dividend income - 78,796 ----------- ----------- Net assets available for plan benefits $25,681,810 $25,004,301 =========== =========== See accompanying notes to financial statements. 2

CONSUMERS WATER COMPANY EMPLOYEES' 401 (k) SAVINGS PLAN AND TRUST Statement of Changes in Net Assets Available for Plan Benefits Year Ended December 31, 1999 Participant Directed Employer Loans Due From Investments Common Stock Participants Total Additions: Investment income $ 1,481,996 $ 186,850 $ 57,722 $ 1,726,568 Realized/unrealized gain (loss) on investments 1,353,580 (417,290) - 936,290 ----------- --------- -------- ----------- Total investment income 2,835,576 (230,440) 57,722 2,662,858 Contributions: Employer - 319,908 - 319,908 Participants 1,271,405 97,088 - 1,368,493 ----------- --------- -------- ----------- Total contributions 1,271,405 416,996 - 1,688,401 Net additions 4,106,981 186,556 57,722 4,351,259 Deductions: Distribution to participants 2,805,558 844,113 20,365 3,670,036 Management fee 3,464 250 - 3,714 ----------- --------- -------- ----------- Net increase (decrease) prior to interfund transfers 1,297,959 (657,807) 37,357 677,509 Interfund transfers (251,703) 117,142 134,561 - ----------- --------- -------- ----------- Net change in plan assets 1,046,256 (540,665) 171,918 677,509 Net assets available for plan benefits: Balance at beginning of year 15,930,204 8,084,743 989,354 25,004,301 ----------- --------- --------- ----------- Balance at end of year $16,976,460 7,544,078 1,161,272 $25,681,810 =========== ========= ========= =========== See accompanying notes to financial statements. 3

CONSUMERS WATER COMPANY EMPLOYEES' 401 (k) SAVINGS PLAN AND TRUST Statement of Changes in Net Assets Available for Plan Benefits Year Ended December 31, 1998 Employer Participant Directed Common Loans Due From Investments Stock Participants Other Total Additions: Investment income $ 2,111,921 $ 309,101 $ 46,099 $ - $ 2,467,121 Realized/unrealized gain (loss) on investments 969,854 2,831,129 - - 3,800,983 ----------- ---------- -------- ------ ----------- Total investment income 3,081,775 3,140,230 46,099 - 6,268,104 Contributions Employer - 328,959 - - 328,959 Participants 1,320,082 86,612 - - 1,406,694 ----------- ---------- -------- ------ ----------- Total contributions 1,320,082 415,571 - - 1,735,653 Net additions 4,401,857 3,555,801 46,099 - 8,003,757 Deductions: Distribution to participants 1,399,460 951,801 66,068 - 2,417,329 Management fee 2,798 516 - - 3,314 ----------- ---------- -------- ------ ----------- Net increase (decrease) prior to interfund transfers 2,999,599 2,603,484 (19,969) - 5,583,114 Interfund transfers 14,768 603,763 21,823 (640,354) - ----------- ---------- -------- ------ ----------- Net change in plan assets 3,014,367 3,207,247 1,854 (640,354) 5,583,114 Net assets available for plan benefits: Balance at beginning of year 12,915,837 4,877,496 987,500 640,354 19,421,187 ----------- ---------- -------- ------ ----------- Balance at end of year $15,930,204 $ 8,084,743 $ 989,354 $ - $25,004,301 =========== =========== ========= ======= =========== See accompanying notes to financial statements. 4

CONSUMERS WATER COMPANY EMPLOYEES' 401(k) SAVINGS PLAN AND TRUST Notes to Financial Statements December 31, 1999 and 1998 (1) MERGER WITH PHILADELPHIA SUBURBAN CORPORATION On March 10, 1999, Consumers Water Company ("the Company") completed a merger ("the Merger") with Philadelphia Suburban Corporation ("PSC"). Pursuant to the merger agreement, PSC issued 13,014,015 shares of common stock to the shareholders of the Company, in exchange for all of the outstanding stock of the Company, including those shares in the Consumers Water Company Employees' 401(k) Savings Plan and Trust ("the Plan"). Each Consumers Water Company Shareholder received 1.432 shares of PSC's Common Stock for each of the Company's Common shares. As a result of the Merger, the Company became a wholly-owned subsidiary of PSC. Subsequent to the conversion to PSC Common Stock, all employee and employer contributions previously invested in the Company's Common Stock is invested in PSC's Common Stock. (2) DESCRIPTION OF PLAN The following description of the Plan is provided for general information purposes only. Participants should refer to the Plan agreement for more complete information. General The Plan is a defined contribution plan covering substantially all employees of the Company and its subsidiaries. An employee becomes eligible to participate on January 1 of the year following the date on which his or her employment commenced. The Plan is subject to the provisions of the Employee Retirement Income Security Act of 1974, as amended (ERISA). An employee may not participate in the Plan if the employee is a participant of a union with which the Company has a collective bargaining agreement directly or through an employee association, unless the collective bargaining agreement between the Company and the union involved specifically makes the Plan applicable to employees covered under such collective bargaining agreements, provided that benefits have been a subject of good faith bargaining between the Company and its employees. Contributions Participants may elect to contribute from 1% to 15% of their pretax compensation pursuant to a salary deferral election, up to a maximum of $10,000 in 1999 and 1998 as determined by Internal Revenue Code ss.402(g)(1). Participants may change the rate of their contribution or their investment elections. They may also make transfers or suspend their contributions at any time. Under the Plan, participants may contribute 1% to 9% of their compensation on an after-tax basis to their voluntary accounts. In any Plan year, a participant's aggregate contributions to the Plan (salary deferral amounts plus after-tax voluntary contributions) may not exceed 15% of such participant's compensation for the applicable Plan year. The Plan provides for the Company to contribute an amount equal to 40% of the pretax employee contribution up to $1,040 for each participant. The Company's contributions consisted of common stock in Consumers Water Company, and subsequent to March 10, 1999 consist of PSC Common Stock. 5

CONSUMERS WATER COMPANY EMPLOYEES' 401(k) SAVINGS PLAN AND TRUST Notes to Financial Statements December 31, 1999 and 1998 (Continued) Participant Accounts Each participant's account is credited with the participant's contribution and allocations of (a) the Company's contribution and (b) Plan earnings. Allocations are based on participant contributions or account balances, as defined by the Plan document. Vesting Each participant will always be 100% vested in all employee and Company contributions. Payment of Benefits In the event a participant's employment is terminated by reason of death, disability or termination of service, a participant's interest will be distributed in a lump-sum payment. Withdrawals will be made in cash or shares of PSC stock, to the extent permitted by law. Under certain circumstances, a participant may withdraw all or a portion of the employee contributions while employed. Loans Due from Participants Participants may borrow funds from their account balance equal to the lesser of $50,000 or half of their vested account balance for a period not to exceed five years. Repayment is made by payroll deduction. During the period covered by the report, all new and outstanding loans were issued at 5.5%. Investment Options Participants can direct, at the time they enroll in the Plan, that their salary deferral and voluntary contributions be invested entirely in one of the funds described below or divided among the funds. Subject to compliance with applicable state and federal securities laws, the Plan also permits participants to acquire an interest in the PSC common stock (Consumers Water Company common stock prior to March 10, 1999), Participants may change their investment instructions and reinvest their contributions in a different fund or funds. A description of each investment option is provided below: The Benham Preservation Fund This fund is invested in the Benham Preservation Fund, which is managed by SEI Trust Co. The Fund is a stable value income trust in which principal is protected from market volatility. The fund invests primarily in guaranteed investment contracts issued by major financial institutions, including banks and life insurance companies. The contracts are only guaranteed with respect to the interest rate, not the principal. This fund was dissolved as of May 30, 1999. All amounts were transferred from this fund to the Stable Asset Fund offered by American Century. The Select Investors Fund This fund invests in the Select Investors Fund offered by American Century. The fund's objective is primarily to provide capital growth with some income. Stocks purchased by the fund are required to pay dividends, but are chosen primarily for growth potential. 6

CONSUMERS WATER COMPANY EMPLOYEES' 401(k) SAVINGS PLAN AND TRUST Notes to Financial Statements December 31, 1999 and 1998 (Continued) The Balanced Investors Fund This fund invests in the Balanced Investors Fund offered by American Century. The fund's objective is to provide for capital growth and current income. The fund invests approximately 60% in common stock and 40% in fixed-income securities. Employer Common Stock This fund invests in the common shares of PSC (Consumers Water Company Common Stock prior to March 10, 1999). The Plan purchases the common shares on the open market or directly from PSC. The Vista Investors Fund This fund invests in the Vista Investors Fund offered by American Century. The fund's objective is capital growth over time by investing in common stocks considered to have better-than-average prospects for appreciation. The Vista Investors Fund remains essentially fully invested in stocks at all times. The Value Fund This fund invests in the Value Fund offered by American Century. The fund's objective is long-term capital growth through investment in equity securities of well-established companies believed to be undervalued at the time of purchase. The fund invests primarily in domestic equity securities, but also invests in other types of domestic or foreign securities that help achieve the fund's objective. The Equity Index Fund This fund invests in the Barclays Global Investors Equity Index Fund. The fund's objective is long-term capital appreciation through investment in stocks to closely replicate the composition of the S&P 500 Index. On February 27, 1999 the Equity Index Fund was replaced by the Equity Index Fund offered by American Century. Stable Asset Fund This fund invests in the Stable Asset Fund offered by American Century. This fund is a collective group trust whose objective is to protect principal from market volatility through a diversified portfolio of high-quality investments issued by major financial institutions, including collateralized stable value vehicles, including guaranteed investment contracts to enhance credit quality and diversification. Equity Index Fund This fund invests in the Equity Index Fund offered by American Century. The fund's objective is long-term capital growth through investment in stocks that comprise the S&P Index, which emphasizes stocks of large U.S. companies, by using an indexing investment approach. Termination of the Plan Although the Company does not intend to terminate the Plan, it may do so at its discretion, subject to the provisions of ERISA. All interests of the participants would be distributed to them as determined by the Committee (as hereinafter defined) and in accordance with applicable provisions of the Internal Revenue Code. 7

CONSUMERS WATER COMPANY EMPLOYEES' 401(k) SAVINGS PLAN AND TRUST Notes to Financial Statements December 31, 1999 and 1998 (Continued) (3) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Accounting The accompanying financial statements have been prepared using the accrual basis. Use of Estimates The preparation of the financial statements in conformity with generally accepted accounting principles requires the Plan's management to use estimates and assumptions that affect the accompanying financial statements and disclosures. Actual results could differ from these estimates. Administration The Plan is administered by a committee ("the Committee") consisting of three or more individuals selected by, and who may be removed at any time by, the Board of Directors of PSC. The Committee members may be employees of PSC and may be participants in the Plan. The Committee members receive no compensation from the Plan for their services in such capacity. The Committee has extensive administrative powers in connection with the Plan, including authority to interpret the provisions of the Plan, to adopt rules for its administration and to make other decisions with respect to the Plan. The custodian for the Plan's funds invests the funds as directed by the participants. The principal duties of the trustees are to receive all contributions paid to the Plan and to make investments and pay benefits as directed by the Committee. The assets of the Plan are held in the name of the Trustees. Substantially all of the administrative expenses of the Plan are paid by the Company. Cash Equivalents All highly liquid investments with a maturity of three months or less are considered to be cash equivalents. Investment Valuation Each investment fund is valued as of each valuation date on the basis of the investment fund's fair market value. The employer stock is valued at market value. The Benham Preservation Fund and the Stable Asset Fund are valued at contract value, which approximates market value. Dividend income is recognized on the date dividends are declared. Interest income is recorded on the accrual basis. Purchases and shares of securities are recorded on a trade-date basis. The accounts of all participants are adjusted as of each valuation date to reflect the effects of income, realized and unrealized gains and losses and expenses applicable to the investment funds where such accounts are invested. In September, 1999, the American Institute of Certified Public Accountants issued Statement of Position 99-3, "Accounting for and Reporting of Certain Defined Contribution Plan Investments and Other Disclosure Matters" "(SOP 99-3)". SOP 99-3 simplifies the disclosure for certain investments and is effective for plan years ending after December 15, 1999 with earlier application encourage. The Plan adopted SOP 99-3 during the Plan year ending December 31, 1999. Accordingly, information previously required to be disclosed about participant- directed fund investment programs are not presented in the Plan's 1999 financial statements. The Plan's 1998 financial statements have been reclassified to conform with the current year's presentation. 8

CONSUMERS WATER COMPANY EMPLOYEES' 401(k) SAVINGS PLAN AND TRUST Notes to Financial Statements December 31, 1999 and 1998 (Continued) Reclassifications Certain reclassifications were made to the 1998 financial statements to conform with the 1999 presentation. (4) INVESTMENTS The fair market values of individual assets that represent 5% or more of the Plan's net assets as of December 31, 1999 and 1998 are as follows: 1999 Select Investors Fund $9,997,086 Balanced Investors Fund $2,665,259 Employer Common Stock $7,224,170 Stable Asset Fund $1,911,761 1998 Select Investors Fund $8,878,513 Balanced Investors Fund $2,999,616 Benham Preservation Fund $2,140,910 Employer Common Stock $7,652,110 (5) FEDERAL INCOME TAX CONSEQUENCES The Internal Revenue Service issued its latest determination letter dated May 3, 1995, which stated that the Plan and related trust, as amended, qualified under applicable provisions of the Internal Revenue Code (IRC) and, therefore are exempt from federal income taxes. The Plan administrator and the Plan's tax counsel believe that the Plan is designed and is currently being operated in compliance with applicable requirements of the IRC. Therefore, no provision for income taxes has been included in the Plan's financial statements. 9

SCHEDULE 1 CONSUMERS WATER COMPANY EMPLOYEES' 401(k) SAVINGS PLAN AND TRUST Schedule of Loans in Default December 31, 1999 Original Amount Principal and Interest Unpaid Balances Date of Date of Interest Identity of Obligor of Loan Received During the Year at End of Year Origin Maturity Rate ------------------- ------- ------------------------ -------------- ------ -------- ---- Participant Loan $21,000 - $13,712 10/17/1997 10/12/2002 5.50% 10

SCHEDULE 2 CONSUMERS WATER COMPANY EMPLOYEES' 401(k) SAVINGS PLAN AND TRUST Schedule of Assets Held for Investment Purposes at End of Year December 31, 1999 Description Original Issuer of Investment Cost Current Value - ------ ------------- -------- ------------- American Century Select Investors Fund $9,997,086 American Century Balanced Investors Fund 2,665,259 Philadelphia Suburban Corporation Common Stock* $4,832,790 7,224,170 American Century Vista Investors Fund 766,961 American Century Value Fund 433,080 American Century Equity Index Fund 1,164,616 American Century Stable Asset Fund 1,911,761 Loans due from participants (5.5% interest rate)* $1,170,174 1,170,174 ----------- Total assets held for investment purposes $25,333,107 =========== * Represents a party-in-interest to the Plan. 11

SCHEDULE 3 CONSUMERS WATER COMPANY EMPLOYEES' 401(k) SAVINGS PLAN AND TRUST Schedule of Reportable Transactions Year Ended December 31, 1999 Description of Purchase Selling Issuer Investment Price Price Cost Net Gain - ------ -------------- ---------- ---------- ---- --------- Philadelphia Suburban Corporation Common Stock* Purchases $1,348,026 - 1,348,026 - Sales - $1,371,338 1,009,680 361,658 *Represents a party-in-interest to the Plan 12