We found 37 public water systems that could serve the same population as Wa-pa Park (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Webster City Water Supply | Webster City | 8,075 | 0 | 5 |
| XENIA RWD (NORTH) | Stratford | 5,888 | 0 | 1 |
| Flying J No 572 | Williams | 1,892 | 0 | 11 |
| Jewell Water Supply | Jewell | 1,215 | 0 | 1 |
| Stratford Muni Water Dept | Stratford | 747 | 0 | 6 |
| Boondocks CafÉ | Williams | 630 | 0 | 161 |
| Ellsworth Public Water Supply | Ellsworth | 531 | 0 | 11 |
| Stanhope Water Department | Stanhope | 427 | 0 | 6 |
| Bethel Reformed Church | Ellsworth | 400 | 0 | 0 |
| Williams Water Supply | Williams | 352 | 0 | 1 |
| Kamrar Water Dept | Kamrar | 229 | 0 | 0 |
| Blairsburg Water Supply | Blairsburg | 215 | 0 | 6 |
| Randall Water Supply | Randall | 173 | 0 | 4 |
| Community Church Of Kamrar | Kamrar | 167 | 0 | 4 |
| Van Diest Supply Company-west End | County of Hamilton | 155 | 0 | 0 |
| Briggs Woods Golf Course | Webster City | 154 | 0 | 0 |
| Nadine's Cafe | County of Hamilton | 150 | 0 | 0 |
| Kendall Young Park | Webster City | 144 | 0 | 0 |
| Little Wall Lk Ar-hamilton Con | Webster City | 124 | 0 | 0 |
| Briggs Woods Park | Webster City | 118 | 0 | 0 |
| Nissen Company | County of Hamilton | 107 | 0 | 0 |
| Van Diest Supply Company-east End | County of Hamilton | 84 | 0 | 0 |
| Land O Lakes Research Farm | Webster City | 78 | 0 | 0 |
| Riverside Lutheran Bible Camp | Story City | 71 | 0 | 0 |
| Olsens Water System | Blairsburg | 60 | 0 | 0 |
| Country Meadows, Inc. | County of Hamilton | 45 | 0 | 0 |
| Bells Mill Park | Webster City | 40 | 0 | 0 |
| Norseman Inn Best Western | Williams | 28 | 0 | 0 |
| Karen's Cafe | County of Hamilton | 25 | 0 | 0 |
| Brewer Park | County of Hamilton | 25 | 0 | 0 |
| Ken's Service | County of Hamilton | 25 | 0 | 0 |
| Woodard Company | County of Hamilton | 25 | 0 | 0 |
| Johnson Auction Company | County of Hamilton | 25 | 0 | 0 |
| Briggs Wds Golf-ham Conservati | County of Hamilton | 25 | 0 | 0 |
| Dot-1 (webster City Maint Gar) | County of Hamilton | 25 | 0 | 0 |
| Boondocks Motel | County of Hamilton | 25 | 0 | 0 |
| Truck Haven CafÉ | County of Hamilton | 25 | 0 | 0 |