| Ambler Borough Water Department |
| Aqua PA |
| Audubon Water Company |
| Boyertown Water Authority |
| Collegeville Trappe Joint Water Works |
| East Greenville Water Department |
| Horsham Township Water Authority |
| North Penn Water Authority |
| North Wales Water Authority |
| Pennsylvania American Water Company |
| Phoenixville Water Department |
| Pottstown Borough Water Authority |
| Red Hill Water Authority |
| Schwenksville Borough Water Authority |
| Superior Water Company |
| Telford Borough Water Authority |
| Upper Hanover Water Authority |
| Ambler WWTP Service Area |
| Berwick Place WWTP Service Area |
| Borough of Bryn Athyn STP Service Area |
| Bridgeport WWTP Service Area |
| Chapel Hill STP Service Area |
| Conshohocken Borough STP Service Area |
| E. Norriton Plymouth Whitpain WWTP Service Area |
| Eureka WWTP Service Area |
| Franconia WWTP Service Area |
| Green Lane STP Service Area |
| Harleysville STP Service Area |
| Hatfield Twp STP Service Area |
| Ivy Ridge WWTP Service Area |
| Kings Road WWTP Service Area |
| Lansdale WWTP Service Area |
| Lower Frederick WWTP Service Area |
| Macoby Creek STP Service Area |
| Mainland STP Service Area |
| Matsunk WPCC Service Area |
| New Hanover WWTP Service Area |
| Norristown STP Service Area |
| Oaks WWTP Service Area |
| PWD's Facilities |
| Park Creek STP Service Area |
| Perkiomen Crossing WWTP Service Area |
| Perkiomen Sewage Treatment Plant |
| Possum Hallow WWTP Service Area |
| Pottstown WWTP Service Area |
| Royersford Borough WWTP Service Area |
| Sandy Run WWTP Service Area |
| Schwenksville Borough Authority WWTP Service Area |
| Souderton WWTP Service Area |
| Swamp Creek STP Service Area |
| Telford STP Service Area |
| Towamencin STP Service Area |
| Trout Run WPCC Service Area |
| Upper Dublin WWTP Service Area |
| Upper Gwynedd Twp WWTP Service Area |
| Upper Montgomery Joint Authority WWTP Service Area |
| Upper Moreland-Hatboro STP Service Area |
| Valley Green WWTP Service Area |
| Whitemarsh STP Service Area |
