| Adamstown Borough Water and Sewer Authority |
| Akron Borough |
| Bainbridge Water Authority |
| Caernarvon Township Authority |
| Christiana Water and Sewer Authority |
| City of Lancaster |
| Columbia Water Company |
| Denver Borough |
| East Cocalico Township Water & Sewer Authority |
| East Donegal Water Authority |
| East Hempfield Water Authority |
| East Petersburg Water Authority |
| Elizabethtown Area Water Authority |
| Ephrata Borough Water and Sewer Authority |
| Lititz Water Authority |
| Manheim Borough Authority |
| Mount Joy Borough Authority |
| Northwestern Authority |
| Quarryville Borough |
| Strasburg Borough Authority |
| Upper Leacock Township |
| Warwick Township Water and Sewer Authority |
| Weaverland Valley Authority |
| West Cocalico Township Authority |
| West Earl Township Water Authority |
| Western Heights Water Company |
| <all other values> |