We found 63 public water systems that could serve the same population as Hecker (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Waterloo | Waterloo | 10,190 | 0 | 8 |
| Columbia | Columbia | 9,208 | 0 | 0 |
| Fountain Water District | Valmeyer | 4,140 | 0 | 6 |
| Valmeyer | Valmeyer | 1,192 | 0 | 26 |
| Monroe County Monroe Co Wt | Monroe County | 315 | 0 | 0 |
| Beck Vocational School | County of Monroe | 300 | 0 | 0 |
| Maeystown | Maeystown | 157 | 0 | 40 |
| Timberlakes Homeowners Association | Waterloo | 99 | 0 | 0 |
| Camp Vandeventer | County of Monroe | 70 | 0 | 0 |
| Beck Vocational School | County of Monroe | 50 | 0 | 0 |
| The Saloon | County of Monroe | 50 | 0 | 0 |
| Gene's Restaurant & Lounge | County of Monroe | 50 | 0 | 0 |
| Hoefft | County of Monroe | 50 | 0 | 0 |
| The Saloon | County of Monroe | 50 | 0 | 0 |
| Hoefft | County of Monroe | 50 | 0 | 0 |
| Roy Heusohn | County of Monroe | 40 | 0 | 0 |
| Waterloo Sportsman's Club | County of Monroe | 40 | 0 | 0 |
| County of Monroe | 40 | 0 | 0 | |
| Ice House Waterloo | County of Monroe | 40 | 0 | 0 |
| Waterloo Sportsman Club D Rahn | County of Monroe | 40 | 0 | 0 |
| Camp Wartburg | County of Monroe | 30 | 0 | 0 |
| Columbia Sportsman's Club | County of Monroe | 30 | 0 | 0 |
| Camp Wartburg | County of Monroe | 30 | 0 | 0 |
| Edmund G Eckart | County of Monroe | 30 | 0 | 0 |
| County of Monroe | 30 | 0 | 0 | |
| Edmund G Eckart | County of Monroe | 30 | 0 | 0 |
| Columbia Sportsman's Club | County of Monroe | 30 | 0 | 0 |
| Expo One | County of Monroe | 25 | 0 | 0 |
| Black Horse Ranch | County of Monroe | 25 | 0 | 0 |
| Holy Cross Lutheran Church | County of Monroe | 25 | 0 | 0 |
| Monroe County Health Dept | County of Monroe | 25 | 0 | 0 |
| Boxtown Inn | County of Monroe | 25 | 0 | 0 |
| Riverside Inn | County of Monroe | 25 | 0 | 0 |
| Holy Cross Lutheran Church | County of Monroe | 25 | 0 | 0 |
| Burksville Tavern | County of Monroe | 25 | 0 | 0 |
| Kelley's Lounge | County of Monroe | 25 | 0 | 0 |
| Garner's Tavern | County of Monroe | 25 | 0 | 0 |
| Prange's Dairy | County of Monroe | 25 | 0 | 0 |
| Fountain Tavern | County of Monroe | 25 | 0 | 0 |
| Monroe County Health Dept | County of Monroe | 25 | 0 | 0 |
| Walmart (138339) | County of Monroe | 25 | 0 | 0 |
| Schnucks 244 Columbia | County of Monroe | 25 | 0 | 0 |
| Schnucks #242 | County of Monroe | 25 | 0 | 0 |
| Freedom Lake | County of Monroe | 25 | 0 | 0 |
| M & B Ice Columbia | County of Monroe | 25 | 0 | 0 |
| Riverside | County of Monroe | 25 | 0 | 0 |
| Black Horse Ranch | County of Monroe | 25 | 0 | 0 |
| Monroe County Health Dept | County of Monroe | 25 | 0 | 0 |
| Monroe County Health Dept | County of Monroe | 25 | 0 | 0 |
| Monroe County Health Dept | County of Monroe | 25 | 0 | 0 |
| Breezy Hill | County of Monroe | 25 | 0 | 0 |
| Timber Lakes Sub Div | County of Monroe | 25 | 0 | 0 |
| Bi-county Health Department | County of Monroe | 25 | 0 | 0 |
| Timber Lakes Sub Div | County of Monroe | 25 | 0 | 0 |
| Chappel Spring | Unspec Pl In Co | 25 | 0 | 0 |
| Joe's Place | County of Monroe | 25 | 0 | 0 |
| Wartburg Inn | County of Monroe | 25 | 0 | 0 |
| Dreamland Palace | County of Monroe | 25 | 0 | 0 |
| St Joe Tavern | County of Monroe | 25 | 0 | 0 |
| Halfway Tavern | County of Monroe | 25 | 0 | 0 |
| Brookie's Tavern | County of Monroe | 25 | 0 | 0 |
| Breezy Hill | County of Monroe | 25 | 0 | 0 |
| Maple Leaf Estates Water Corporation | County of Monroe | 0 | 0 | 0 |