Press release: New Mexico American Water to be sold

January 24, 2011 – American Water Works Company, Inc. (NYSE:

AWK), the largest investor-owned U.S. water and wastewater utility company, today announced

that it has entered into an agreement with EPCOR Water (USA) Inc. (“EPCOR USA”) to sell 100

percent of the stock of its companies that provide regulated water and wastewater services located

in Arizona and New Mexico, for an estimated sale price of $470 million, subject to certain

adjustments. American Water’s total investment in both subsidiaries was approximately $450

million as of December 31, 2010. American Water said it plans to use the proceeds from the sale

to reduce both equity and debt financing. The completion of the transaction is subject to

customary closing conditions including regulatory approval by public utility commissions in both

Arizona and New Mexico.

“This transaction allows us to direct our focus to those operations where we can best serve

customers and meet business objectives,” said Jeff Sterba, president and CEO of American

Water. “Additionally, with this transaction we do not anticipate the need for an equity offering in

2011.”

American Water serves approximately 174,000 customers in Arizona and New Mexico. Both

American Water and EPCOR are committed to working together to ensure that the transition is a

smooth one for customers and that reliable service will continue throughout the transition. Both

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PRESS RELEASE

companies also place significant value in the over 220 employees who work in New Mexico and

Arizona and pledge to make this change as seamless as possible. EPCOR USA anticipates that

employees will continue to operate these systems within the EPCOR family, once the transaction

closes.

EPCOR USA is in the business of building, owning and operating water and wastewater

treatment facilities in the southwestern United States. In 2010, EPCOR USA entered into an

agreement with American States Water to purchase and operate the Chaparral City Water

Company, which serves 13,000 customers in the town of Fountain Hills, Arizona.

EPCOR USA is a wholly owned subsidiary of EPCOR Utilities, Inc. (“EUI”). EUI builds, owns

and operates water and wastewater treatment facilities, and electric transmission and distribution

networks. It provides water and wastewater services to more than one million people in over 70

communities in Western Canada.

Founded in 1886, American Water is the largest investor-owned U.S. water and wastewater utility

company. With headquarters in Voorhees, N.J., the company employs more than 7,000 dedicated

professionals who provide drinking water, wastewater and other related services to approximately

15 million people in more than 30 states and parts of Canada.