We found 33 public water systems in Emmet county (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Estherville Water Treatment Plant | Estherville | 6,430 | 0 | 1 |
| Armstrong Water Supply | Armstrong | 943 | 0 | 10 |
| Clay Regional Water - Superior Subsystem | Estherville | 500 | 0 | 0 |
| Ringsted Water Supply | Ringsted | 422 | 0 | 1 |
| Suburban Estates Golf Course | County of Emmet | 350 | 0 | 0 |
| Gkn Armstrong Wheels | Armstrong | 230 | 0 | 0 |
| Wallingford Municipal Waterworks | Wallingford | 199 | 0 | 10 |
| Golden Sun Feeds | County of Emmet | 136 | 0 | 0 |
| Iowa Lakes Regional Water - Gruver | Gruver | 129 | 0 | 1 |
| Forest Ridge - Center | Wallingford | 120 | 0 | 0 |
| Arts-way Manufacturing, Co., Inc. | Armstrong | 108 | 0 | 0 |
| Gruver Water Works | Gruver | 106 | 0 | 0 |
| Fort Defiance State Park | Estherville | 104 | 0 | 0 |
| Wolden Recreation Area | Estherville | 100 | 0 | 0 |
| Jean's Cafe | Wallingford | 100 | 0 | 0 |
| Heartland Hills Golf Club | Estherville | 89 | 0 | 0 |
| Forest Ridge - Cedar Hall | Estherville | 76 | 0 | 0 |
| Tuttle Lake-emmet Conservation | Estherville | 75 | 0 | 0 |
| Dolliver Muni Water Supply | Dolliver | 68 | 0 | 0 |
| Ingham Lake Bible Camp | Wallingford | 60 | 0 | 0 |
| Oak Shores | Armstrong | 53 | 0 | 0 |
| Ingham Lake Estates | Wallingford | 46 | 0 | 0 |
| Ridgeroad Development | Estherville | 27 | 0 | 0 |
| Olsen Spring | County of Emmet | 25 | 0 | 0 |
| Quarterdeck Lounge | County of Emmet | 25 | 0 | 0 |
| Holiday Mountain Inc | County of Emmet | 25 | 0 | 0 |
| Riverview Golf Course | County of Emmet | 25 | 0 | 0 |
| A&w Family Restaurant | County of Emmet | 25 | 0 | 0 |
| Chief Drive In | Estherville | 25 | 0 | 0 |
| Skyline Motel | County of Emmet | 25 | 0 | 0 |
| Pappy's Place | County of Emmet | 25 | 0 | 0 |
| Pier 9 Motel | County of Emmet | 25 | 0 | 0 |
| Iowa Lake - Emmet Co Conservation | Dolliver | 25 | 0 | 0 |