| Adamstown Borough Water and Sewer Authority |
| Akron Borough Sewer Authority |
| Caernarvon Township Authority |
| Christiana Water and Sewer Authority |
| City of Lancaster |
| Clay Township |
| Conoy Township |
| Denver Borough |
| Earl Township Sewer Authority |
| East Cocalico Township Water & Sewer Authority |
| East Lampeter Sewer Authority |
| Elizabethtown Borough |
| Elizabethtown Regional Sewer Authority |
| Ephrata Borough Water and Sewer Authority |
| Georgetown Area Sewer Authority |
| Lancaster Area Sewer Authority |
| Leacock Township Sewer Authority |
| Lititz Sewer Authority |
| Manheim Borough Authority |
| Manor Township |
| Marietta-East Donegal Joint Authority |
| Masonic Homes |
| Millersville Borough |
| Mount Joy Borough Authority |
| Northern Lancaster County Authority |
| Northwestern Lancaster County Authority |
| Paradise Township Sewer Authority |
| Quarryville Borough and Sewer Authority |
| Sadsbury Township Sewer Authority |
| Strasburg Borough Authority |
| Suburban Lancaster Area Sewer Authority |
| Upper Leacock Township and Leola Sewer Authority |
| Warwick Township Water and Sewer Authority |
| Weaverland Valley Authority |
| West Cocalico Township Authority |
| West Donegal Sewer and Water Authority |
| West Earl Township (Brownstown) |
| <all other values> |