| Public water system | Population served |
|---|---|
| BERKELEY COUNTY PSWD-POTOMAC RIVER | 69,372 |
| MORGANTOWN UTILITY BOARD | 66,851 |
| PARKERSBURG UTILITY BOARD | 34,251 |
| FAIRMONT CITY OF | 30,586 |
| WHEELING | 29,899 |
| PUTNAM P S D | 26,410 |
| CLARKSBURG WATER BOARD | 19,072 |
| WEIRTON AREA WATER BOARD | 18,633 |
| LOGAN COUNTY PSD - NORTHERN REGIONAL | 16,921 |
| MARTINSBURG CITY OF | 16,250 |
| CHARLES TOWN UTILITIES | 15,220 |
| ST ALBANS WATER | 13,758 |
| VIENNA | 12,507 |
| LEWISBURG | 12,065 |
| LUBECK PSD | 11,724 |
| KENOVA MUNICIPAL WATER | 11,192 |
| BRIDGEPORT CITY OF | 10,775 |
| MOUNDSVILLE | 9,911 |
| ELKINS CITY OF | 9,350 |
| HURRICANE CITY OF | 8,987 |
| PRESTON COUNTY PSD 4 | 8,753 |
| CLAYWOOD PARK PSD | 8,141 |
| BUCKHANNON WATER BOARD | 8,098 |
| UNION WILLIAMS P S D | 7,883 |
| KINGWOOD WATER BOARD | 7,674 |
| LAVALETTE PSD | 7,455 |
| FRANKFORT PSD | 6,747 |
| RALEIGH COUNTY PSD ARNETT | 6,663 |
| GRAFTON CITY OF | 6,333 |
| OHIO COUNTY PSD | 6,297 |
| BLUEWELL PSD | 6,216 |
| WILDERNESS PSD | 6,106 |
| SOUTHERN JACKSON COUNTY P S D | 6,070 |
| CLINTON WATER ASSOC - ROUTE 119 | 5,733 |
| MINERAL WELLS PSD | 5,674 |
| ATHENS TOWN OF | 5,633 |
| SUMMERSVILLE MUNICIPAL WATER | 5,574 |
| WAYNE WATER TOWN OF | 5,519 |
| MILTON WATER | 5,446 |
| RIPLEY CITY OF | 5,420 |
| RED SULPHUR PSD | 5,331 |
| SOUTHWESTERN WATER DISTRICT | 5,296 |
| NEW MARTINSVILLE | 5,272 |
| POINT PLEASANT WATER WORKS | 5,146 |
| RAVENSWOOD MUNICIPAL WATER WORKS | 5,047 |
| CRAIGSVILLE PSD | 4,997 |
| FOLLANSBEE HOOVERSON HEIGHTS | 4,970 |
| SHINNSTON CITY OF | 4,959 |
| GREEN VALLEY GLENWOOD PSD GLENWOOD | 4,914 |
| KEYSER CITY OF | 4,796 |
| HUTTONSVILLE PSD | 4,758 |
| SPENCER WATER DEPT | 4,630 |
| GRANT CO PSD-NORTHFORK-MAYSVILLE | 4,559 |
| FLATWOODS CANOE RUN PSD | 4,344 |
| CORPORATION OF SHEPHERDSTOWN | 4,300 |
| MASON CO PSD-LAKIN DIST | 4,296 |
| COOL RIDGE FLAT TOP PSD | 4,190 |
| MARSHALL COUNTY PSD 4 | 4,063 |
| VALLEY FALLS PSD | 4,042 |
| LINCOLN PSD | 4,039 |
| WELLSBURG, CITY OF | 4,019 |
| RAVENCLIFF MCGRAWS SAULSVILLE PSD | 3,967 |
| GAULEY RIVER PSD | 3,944 |
| MASON CO PSD - ASHTON | 3,902 |
| CLAY BATTELLE PSD | 3,858 |
| WHITE SULPHUR SPRINGS WATER | 3,845 |
| MIDLAND PSD | 3,802 |
| OCEANA COMMUNITY OF | 3,796 |
| LOGAN WATER BOARD CITY OF | 3,662 |
| NETTIE LEIVASY PSD | 3,630 |
| EASTERN WYOMING PSD STEPHENSON WTP | 3,616 |
| LOGAN CO PSD-GREENVILLE SYSTEM | 3,611 |
| PHILIPPI CITY OF | 3,544 |
| BUFFALO CREEK PSD | 3,542 |
| GREATER HARRISON PSD LOST CREEK MT CLARE | 3,536 |
| BERKELEY SPRINGS CITY OF | 3,526 |
| WILLIAMSTOWN WATER DEPT | 3,469 |
| CRUM PSD | 3,463 |
| MARSHALL COUNTY PSD 1 | 3,463 |
| PRESTON COUNTY PSD 1 | 3,455 |
| RALEIGH COUNTY PSD COAL CITY | 3,415 |
| MASON CO PSD-LETART | 3,303 |
Largest first by population served, as each employer reports it to its federal registry.
Source: U.S. Environmental Protection Agency, Safe Drinking Water Information System (SDWIS/Fed), community water systems. Data captured October 2, 2026.
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