ABC Water
Albert Gallatin Municipal Borough
Allegheny Energy
Armstrong Power Station
Belle Vernon Borough Municipal Authority
Brackenridge Borough
Dunkard Valley Joint Municipal Authority
East Dunkard Water Association
Emlenton Water
Harrison Township Water Authority
Kittanning Suburban Water Authority
Masontown Municipal Water Works
Moon Township Water Authority
Municipal Authority of Buffalo Township
Municipal Authority of New Kensington
Municipal Authority of Westmoreland County
Municipal Authority Township of Robinson
Newell Municipal Water Authority
North Fayette County Municipal Authority
Oakmont Borough Municipal Authority
Parker City Water Authority
Pennsylvania American Water
Pittsburgh Water and Sewer Authority
Point Marion Boro
Rowlesburg Water
Shaler Water
South Western Pennsylvania Water Authority
Tarentum Water
Tri County Joint Municipal Authority
Washington Township Municipal Authority
West View Water Authority
Wilkinsburg-Penn Joint Water Authority