EPCOR Water Share: Utilities EPCOR Water Visit Website 2355 W. Pinnacle Peak Rd Suite 300 Phoenix, AZ 85027 (602) 759-5972 About Map About EPCOR USA is the largest, private regulated water utility in Arizona and New Mexico. EPCOR USA now provides water and wastewater services to approximately 195,000 customer connections across 22 communities and seven counties. What's Nearby? Distance: 5 10 15 20 25 50 mi.