We found 47 public water systems that could serve the same population as Okawville (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Washington County Water Company | Nashville | 11,224 | 35 | 6 |
| Nashville | Nashville | 4,068 | 0 | 4 |
| Irvington | Irvington | 1,245 | 0 | 3 |
| Hoyleton Rwc | Hoyleton | 1,080 | 0 | 2 |
| Ashley | Ashley | 650 | 0 | 16 |
| Hoyleton | Hoyleton | 560 | 0 | 4 |
| Richview | Richview | 458 | 0 | 0 |
| County of Washington | 400 | 0 | 0 | |
| Washington Conservation Area | County of Washington | 400 | 0 | 0 |
| New Minden | New Minden | 280 | 0 | 0 |
| Radom | Radom | 236 | 0 | 5 |
| Dubois | Dubois | 229 | 0 | 4 |
| Eagles Nest | County of Washington | 200 | 0 | 0 |
| Addie Inn | County of Washington | 170 | 0 | 0 |
| Johannisburg School | County of Washington | 168 | 0 | 0 |
| Oakdale School | County of Washington | 123 | 0 | 0 |
| Saint Charles School | County of Washington | 120 | 0 | 0 |
| Original Mineral Springs Hotel | County of Washington | 100 | 0 | 0 |
| Addieville Grade School | County of Washington | 85 | 0 | 0 |
| Saint Michael School | County of Washington | 85 | 0 | 0 |
| Addieville Grade School | County of Washington | 85 | 0 | 0 |
| The Lounge | County of Washington | 70 | 0 | 0 |
| The Lounge | County of Washington | 70 | 0 | 0 |
| County of Washington | 70 | 0 | 0 | |
| Du Bois Center | County of Washington | 70 | 0 | 0 |
| Bobby's Hi-lo Tavern | County of Washington | 50 | 0 | 0 |
| Bud & Becky's Blue Moon | County of Washington | 50 | 0 | 0 |
| Fireside Inn | County of Washington | 50 | 0 | 0 |
| Black Top Tavern | County of Washington | 50 | 0 | 0 |
| Fireside Inn | County of Washington | 50 | 0 | 0 |
| Joe & Alberta's Tavern | County of Washington | 50 | 0 | 0 |
| Bud & Becky's Blue Moon | County of Washington | 50 | 0 | 0 |
| Black Top Tavern | County of Washington | 50 | 0 | 0 |
| Joe & Alberta's Tavern | County of Washington | 50 | 0 | 0 |
| Hoyleton-new Minden | New Minden | 48 | 0 | 0 |
| County of Washington | 40 | 0 | 0 | |
| Jolly Acre Tavern | County of Washington | 35 | 0 | 0 |
| Jolly Acre Tavern | County of Washington | 35 | 0 | 0 |
| Bergman Tavern | County of Washington | 30 | 0 | 0 |
| Bergman Tavern | County of Washington | 30 | 0 | 0 |
| Washington Co Cons Area | County of Washington | 25 | 0 | 0 |
| Okawville Farmers Elevator | County of Washington | 25 | 0 | 0 |
| County of Washington | 25 | 0 | 0 | |
| United Christian Church | County of Washington | 25 | 0 | 0 |
| Okawville Farmers Elevator | County of Washington | 25 | 0 | 0 |
| Lark Club | County of Washington | 25 | 0 | 0 |
| Washington Cnty Cnsrvtn Area | Unspec Pl In Co | 25 | 0 | 0 |