We found 49 public water systems that could serve the same population as Toolesboro Mounds Site (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Wapello Municipal Water Works | Wapello | 2,067 | 0 | 4 |
| Columbus Junction Water Supply | Columbus Junction | 1,899 | 0 | 4 |
| Tyson Fresh Meats Inc (columbus Jct) | Columbus Junction | 1,200 | 0 | 7 |
| Louisa-muscatine Community School | Letts | 1,190 | 0 | 26 |
| Morning Sun Water Department | Morning Sun | 836 | 0 | 3 |
| Caseys #3449 | Morning Sun | 715 | 0 | 10 |
| Grandview Muni Water Dept | Grandview | 564 | 0 | 1 |
| Snively Access | Wapello | 460 | 0 | 0 |
| Columbus City Public Water Supply | Columbus City | 391 | 0 | 11 |
| L And M Elementary School | County of Louisa | 298 | 0 | 0 |
| Rath Packing Plant | County of Louisa | 280 | 0 | 0 |
| Marvin 66 Station | County of Louisa | 250 | 0 | 0 |
| Grandview Country Cafe | Grandview | 210 | 0 | 0 |
| Dairy Sweet | County of Louisa | 200 | 0 | 0 |
| Weber & Houston Inc. | County of Louisa | 200 | 0 | 0 |
| Cotter Elementary School | Cotter | 185 | 0 | 0 |
| Oakville Water Supply | Oakville | 173 | 0 | 14 |
| Cedarcrest Golf & Country Club | Columbus Junction | 146 | 0 | 14 |
| Louisa National Wildlife Refug | County of Louisa | 136 | 0 | 0 |
| Mediapolis Community School H | County of Louisa | 133 | 0 | 0 |
| Woodland Wapello Mobile Home Park | Wapello | 126 | 0 | 51 |
| Grandview Drive In | Grandview | 102 | 0 | 0 |
| Wapello | County of Louisa | 80 | 0 | 0 |
| Deese Thirsty Camel | Conesville | 67 | 0 | 0 |
| Heritage Oaks Golf & Country Club | Wapello | 60 | 0 | 0 |
| Cedar River Trailer Park | Columbus Junction | 53 | 0 | 0 |
| Louisa Co Law Enforcement Ctr | Wapello | 46 | 0 | 0 |
| Port Louisa Land Company | County of Louisa | 45 | 0 | 0 |
| Cedar River Trailer Park (inactive) | County of Louisa | 40 | 0 | 0 |
| Sulzberger Migrant Labor Camp | County of Louisa | 36 | 0 | 0 |
| Bieri Equipment Company | County of Louisa | 35 | 0 | 0 |
| Snyder Migrant Labor Camp | County of Louisa | 32 | 0 | 0 |
| Odessa Grill | Wapello | 32 | 0 | 0 |
| Wiele Motor | Columbus Junction | 31 | 0 | 0 |
| Lake Odessa Cabin Owners Assoc. | Wapello | 31 | 0 | 0 |
| Airport Super Market | County of Louisa | 30 | 0 | 0 |
| Island Grocery | Grandview | 27 | 0 | 0 |
| Letts Community Building | Letts | 27 | 0 | 0 |
| Papas Paradise Llc | Wapello | 27 | 0 | 0 |
| Letts United Methodist Church | Letts | 26 | 0 | 0 |
| Kingsbury Inn | County of Louisa | 25 | 0 | 0 |
| Bretz Trailer Pk | County of Louisa | 25 | 0 | 0 |
| Virginia Grove Pk-louisa Cons | County of Louisa | 25 | 0 | 0 |
| Flaming Prairie Pk-louisa Cons | County of Louisa | 25 | 0 | 0 |
| Sand Run Area | County of Louisa | 25 | 0 | 0 |
| Townsly Migrant Labor Camp | County of Louisa | 25 | 0 | 0 |
| Natural Gas Pipeline Station # 204 | Columbus Junction | 25 | 0 | 0 |
| Odessa Dells | Wapello | 25 | 0 | 0 |
| Wapello Valley Meat Processing | County of Louisa | 25 | 0 | 0 |