We found 56 public water systems that could serve the same population as Webster Groves (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Mo American St Louis Co St Charles Co | Counties of St. Charles, St. Louis | 1,100,000 | 215 | 3 |
| St Louis City | St. Louis | 315,685 | 82 | 1 |
| Florissant | Florissssant | 38,046 | 0 | 0 |
| Kirkwood | Kirkwood | 28,000 | 40 | 0 |
| Eureka | Eureka | 10,000 | 0 | 13 |
| Valley Park | Valley Park | 3,600 | 0 | 0 |
| Six Flags St Louis | County of St. Louis | 3,200 | 0 | 3 |
| Times Beach | Times Beach | 2,061 | 0 | 0 |
| St Louis Co Pwsd #1 | Stlouis Co Pwsd | 1,800 | 0 | 0 |
| Mo Eastern Correctional Center | County of St. Louis | 1,100 | 0 | 7 |
| Paradise Valley Subd | Counties of Jefferson, St. Louis | 560 | 0 | 0 |
| Rockwoods Reservation | County of St. Louis | 550 | 0 | 7 |
| St Louis Co Pwsd #2 | Stlouis Co Pwsd | 530 | 0 | 0 |
| Chesterfield Elem School | Chesterfield El | 510 | 0 | 0 |
| Babler State Park | County of St. Louis | 500 | 0 | 11 |
| Rockwood Reservation | Rockwood Reserv | 340 | 0 | 0 |
| Concord Village Youth Sports Complex | County of St. Louis | 200 | 0 | 0 |
| Pevely Farm Golf Club | County of St. Louis | 200 | 0 | 15 |
| Crescent Farms Golf Club | County of St. Louis | 100 | 0 | 0 |
| Sunset Tee | Sunset Tee | 100 | 0 | 0 |
| Greensfelder County Park | County of St. Louis | 100 | 0 | 0 |
| Hidden Valley Golf Course | County of St. Louis | 100 | 0 | 0 |
| Ballwin Ridge Health & Rehab | County of St. Louis | 90 | 0 | 0 |
| Whispering Oaks Health Care | County of St. Louis | 90 | 0 | 0 |
| Pevely Farm Homeowners Association | County of St. Louis | 85 | 0 | 0 |
| The Wedge | County of St. Louis | 85 | 0 | 0 |
| Holiday Inn At Six Flags | County of St. Louis | 65 | 0 | 0 |
| WYMAN | County of St. Louis | 50 | 0 | 0 |
| Jay Henges Range | County of St. Louis | 50 | 0 | 0 |
| Paradise Valley Golf & Country Club | County of St. Louis | 50 | 0 | 0 |
| Shell Oil Company Allent | County of St. Louis | 46 | 0 | 0 |
| Al Pac Homeless Shelter | County of St. Louis | 35 | 0 | 0 |
| Outdoor Equipment Co | County of St. Louis | 35 | 0 | 0 |
| Ridgetree Trails | County of St. Louis | 30 | 0 | 0 |
| West Tyson County Park | County of St. Louis | 30 | 0 | 0 |
| The Red Cedar Inn | The Red Cedar | 30 | 0 | 0 |
| Tyson Research Center | County of St. Louis | 26 | 0 | 0 |
| St Louis City Howard Bend | St L Howard Ben | 25 | 0 | 0 |
| St Louis City-chain Of Rocks | St L Chain Rock | 25 | 0 | 0 |
| Castlewood State Park | Castlewood Pk | 25 | 0 | 0 |
| St Louis Co Water Co- Merame | County of St. Louis | 25 | 0 | 0 |
| Beacon Motel | Beacon Motel | 25 | 0 | 0 |
| St Louis Co Water Co North | St Louis Co Wat | 25 | 0 | 0 |
| St Louis Co Water Co South | St Louis Co Wat | 25 | 0 | 0 |
| St Louis County Water Co-centr | St Louis Co Wat | 25 | 0 | 0 |
| WORD OF FAITH FELLOWSHIP | Word Of Faith | 25 | 0 | 0 |
| Creve Couer Airport | Creve Couer Air | 25 | 0 | 0 |
| Gateway Campground | Gateway Campgrd | 25 | 0 | 0 |
| Quarry Hill Golf Practice Center | County of St. Louis | 25 | 0 | 0 |
| Lone Elk County Park | County of St. Louis | 25 | 0 | 0 |
| Aberdeen Golf Club | County of St. Louis | 25 | 0 | 0 |
| WORLD BIRD SANCTUARY | County of St. Louis | 25 | 0 | 0 |
| Jellystone Park Cmpgrd | County of St. Louis | 25 | 0 | 0 |
| Marianist Retreat Center | County of St. Louis | 25 | 0 | 0 |
| Wildhorse Creek Amoco | County of St. Louis | 25 | 0 | 0 |
| Western Oil Company | County of St. Louis | 25 | 0 | 0 |