Filed by: Philadelphia Suburban Corporation Pursuant to Rule 425 under the Securities Act of 1933, as amended Subject Company: Pennichuck Corporation Commission File No.: 0-18552 Contact: Donna Alston Manager, Communications 610-645-1095 Barbara Cummings Director, Shareholder Relations 610-645-1196 PHILADELPHIA SUBURBAN CORPORATION ANNOUNCES FIRST QUARTER OPERATING RESULTS FOR 2002 BRYN MAWR, PA, May 8, 2002 - Philadelphia Suburban Corporation (NYSE:PSC) today announced first quarter net income of $11.9 million or $0.17 per share compared to $13.1 million or $0.19 per share in 2001 on an additional 1.1 million average shares outstanding. First quarter 2001 was positively impacted by a $0.02 per share gain on the sale of land with no comparable gain in the first quarter of 2002. Absent the impact of the sale of land, income for the first quarter of 2002 was $11.9 million, versus $11.4 million for the same period in 2001, an increase of 4.4 percent and income per share was $0.17 for the quarters ended March 31, 2002 and 2001. Revenues for the quarter increased 2.1 percent to $71.7 million, versus $70.2 million in 2001. The company's increased revenue was due to customer growth and rate relief in various

states in which the company operates, partially offset by a decline in the company's industrial water sales on a same-system basis and reduced residential usage due to drought restrictions in two of the company's operating subsidiaries; Pennsylvania and New Jersey. Operations and maintenance expenses for the quarter increased four percent in comparison to the first quarter of 2001. The increase in O&M expenses is attributed to expenses associated with customer growth (newly acquired systems), higher insurance expenses and other normal expense increases. PSC announced four acquisitions and other growth ventures during the first quarter, and seven acquisitions and growth ventures to date including the company's acquisition of Piedmont Water Company, Inc., a private water utility serving more than 2,800 customers in Iredell and Catawba counties in North Carolina. With the Piedmont purchase, PSC now serves more than 25,000 residents in 22 counties in North Carolina. On April 29, 2002 the company announced its proposed merger with Pennichuck Corporation (NASDAQ:PNNW), the largest publicly traded water utility in New Hampshire serving approximately 30,000 customers. New Hampshire will become the seventh state in which the company operates. The merger will create a combined company with over 630,000 customer accounts, serving over two million people. According to PSC Chairman and President Nicholas DeBenedictis, "We are very pleased with the announcement of the Pennichuck merger. This transaction represents the launching of another growth platform for PSC. The Pennichuck merger is consistent with the company's growth strategy and we are optimistic that it will provide additional opportunities for growth in this region." PSC is one of the nation's largest investor-owned water utilities, serving approximately two million residents in Pennsylvania, Illinois, Ohio, New Jersey, Maine, and North Carolina. PSC is a

publicly-traded company listed on both the New York and Philadelphia Stock Exchanges under the ticker symbol "PSC" and has been committed to the preservation and improvement of the environment throughout its history, which spans more than 100 years. The company's quarterly conference call with analysts will be at 11:00 a.m. Eastern Standard Time today. Interested parties may listen to the conference call over the Internet by logging onto The call will be recorded and replayed beginning 1:00 p.m., Wednesday, May 8, 2002, and will run until 12:00 p.m., Friday, May 10, 2002. The dial-in telephone number for the audio replay is (973) 341-3080 (pin number 3258395).

The following table shows selected operating data for the quarters ended March 31, 2002 and 2001 (in thousands, except per share data) for Philadelphia Suburban Corporation. Quarter Ended March 31, Unaudited) ------------------------- 2002 2001 --------- --------- Operating revenues $ 71,669 $ 70,193 Net income available to common stock* $ 11,875 $ 13,085 Gain on sale of land, net of tax $ 1,678 --------- --------- Income exclusive of net land sale gain $ 11,875 $ 11,407 ========= ========= Basic net income per share* $ 0.17 $ 0.19 Diluted net income per share* $ 0.17 $ 0.19 Gain on sale of land, net of tax $ 0.02 --------- --------- Income per common share exclusive of net land sale gain $ 0.17 $ 0.17 ========= ========= Average common shares outstanding: Basic 68,451 67,440 Diluted 69,300 68,247 * The first quarter 2001 amount includes a net gain of $1,678 or $0.02 per share gain on the sale of land with no comparable gain in the first quarter of 2002. This release contains certain forward-looking statements involving risks and uncertainties and other factors that may cause actual results to be materially different from any future results expressed or implied by such forward-looking statements. These factors include, among others, the following: general economic business conditions; unfavorable weather conditions; the success of certain cost containment initiatives; changes in regulations or regulatory treatment; availability and cost of capital; the success of growth initiatives; and the completion of the merger with Pennichuck Corporation. A registration statement and proxy statement/prospectus will be filed with the Securities and Exchange Commission by Philadelphia Suburban and Pennichuck. Investors and security holders may obtain a free copy of the registration statement and proxy statement/prospectus (when they are available) and other documents filed by Philadelphia Suburban and Pennichuck at the Commission's website at The proxy statement/prospectus and such other documents may also be obtained from Philadelphia Suburban or from Pennichuck by directing such request to Philadelphia Suburban Corporation, 762 West Lancaster Avenue, Bryn Mawr, Pennsylvania 19010, Attn: Corporate Secretary; or to Pennichuck Corporation, 4 Water Street, Nashua, NH 03060. The definitive registration statement and proxy/prospectus should be read carefully before making a decision concerning the transaction. Investors and security holders are urged to read Philadelphia Suburban's registration statement on Form S-4 and the proxy statement/prospectus and any other relevant documents relating to the transaction when they become available, because they will contain important information.

Philadelphia Suburban Corporation and Subsidiaries Consolidated Statements of Income and Comprehensive Income (In thousands, except per share amounts) (Unaudited) Quarter Ended March 31, -------------------------- 2002 2001 Operating revenues $ 71,669 $ 70,193 Cost & expenses: Operations and maintenance 27,285 26,186 Depreciation 9,893 8,953 Amortization 540 522 Taxes other than income taxes 5,314 5,588 ------------ ------------ Total 43,032 41,249 ------------ ------------ Operating income 28,637 28,944 Other expense (income): Interest expense, net 9,780 10,262 Allowance for funds used during construction (386) (248) Gain on sale of other assets (349) (2,791) ------------ ------------ Income before income taxes 19,592 21,721 Provision for income taxes 7,702 8,609 ------------ ------------ Net income 11,890 13,112 Dividends on preferred stock 15 27 ------------ ------------ Net income available to common stock $ 11,875 $ 13,085 ============ ============ Net income $ 11,890 $ 13,112 Other comprehensive income (loss), net of tax: Unrealized gain (loss) on securities $ 128 $ (557) Reclassification adjustment for gains reported in net income (227) -- ------------ ------------ Comprehensive income $ 11,791 $ 12,555 ============ ============ Net income per common share: Basic $ 0.17 $ 0.19 Diluted $ 0.17 $ 0.19 Average shares outstanding: Basic 68,451 67,440 ============ ============ Diluted 69,300 68,247 ============ ============