We found 61 public water systems that could serve the same population as Sweet Marsh Wildlife Area (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Ia Regional Utilities Assoc (waverly) | Waverly | 34,245 | 87 | 2 |
| Waverly Water Department | Waverly | 9,874 | 0 | 2 |
| Sumner Water Supply | Sumner | 2,053 | 0 | 38 |
| Denver Water Supply | Denver | 1,780 | 0 | 3 |
| Tripoli Water Supply | Tripoli | 1,354 | 0 | 1 |
| Janesville Water Supply | Janesville | 930 | 0 | 11 |
| Readlyn Water Supply | Readlyn | 808 | 0 | 0 |
| Plainfield Water Supply | Plainfield | 436 | 0 | 5 |
| Camp Ingawanis-maple Well | Waverly | 406 | 0 | 14 |
| Wapsie Valley Com Sch-fairbank | Fairbank | 285 | 0 | 0 |
| Waverly Pit Lane Travel Plaza | Waverly | 205 | 0 | 17 |
| Heritage United Methodist Church | Waverly | 200 | 0 | 7 |
| Camp Ingawanis-ranger Well | Waverly | 150 | 0 | 9 |
| Waverly Mobile Home Park | Waverly | 150 | 0 | 0 |
| Hinds Enterprises | County of Bremer | 150 | 0 | 0 |
| Hwy 3 Drive In Theater | County of Bremer | 145 | 0 | 0 |
| Winners Circle | Waverly | 137 | 0 | 0 |
| Saints Avenue Apartments | Waverly | 125 | 0 | 21 |
| Meadow Lane Mobile Home Park | Denver | 115 | 0 | 0 |
| Oberheus Restaurant | County of Bremer | 114 | 0 | 0 |
| Blue Sky Tap And Grill | County of Bremer | 100 | 0 | 0 |
| Randy's Cafe | County of Bremer | 100 | 0 | 0 |
| Immanuel Lutheran Church & School | Readlyn | 70 | 0 | 0 |
| Immanuel Lutheran School | County of Bremer | 70 | 0 | 0 |
| Star Motel | County of Bremer | 65 | 0 | 0 |
| The Larrabee Center | Waverly | 60 | 0 | 0 |
| Riverview Mobile Home Court | County of Bremer | 55 | 0 | 0 |
| G&b Restaurant | County of Bremer | 55 | 0 | 0 |
| Maple Hills Country Club | Tripoli | 55 | 0 | 0 |
| Henke Manufacturing | County of Bremer | 53 | 0 | 0 |
| Sumner Cafe | Sumner | 53 | 0 | 0 |
| Grand Vu Mobile Park | Tripoli | 53 | 0 | 0 |
| Bottomz Up | Frederika | 53 | 0 | 0 |
| Cliffs Place Inc | Plainfield | 51 | 0 | 0 |
| Cafe 63 | County of Bremer | 50 | 0 | 0 |
| Canfield's Supper Club | Denver | 50 | 0 | 0 |
| Denver Hills Subdivision | Denver | 50 | 0 | 0 |
| Wapsie Ridge Golf Course, Inc. | Fairbank | 47 | 0 | 0 |
| Bremer Utilities | Bremer | 45 | 0 | 0 |
| Sylvan Acres | Janesville | 44 | 0 | 0 |
| Stephanie Beesecker Dds | Sumner | 42 | 0 | 0 |
| 7 Bridges Pk-bremer Conservati | County of Bremer | 40 | 0 | 0 |
| Center Valley Supper Club | County of Bremer | 40 | 0 | 0 |
| North Woods Park | Sumner | 31 | 0 | 0 |
| Hawkes Nest Cafe | Frederika | 30 | 0 | 0 |
| Cedar Bend Park | Waverly | 26 | 0 | 0 |
| Pete's Mobile Home Court | County of Bremer | 26 | 0 | 0 |
| Pat's Place | County of Bremer | 25 | 0 | 0 |
| North Cedar Park | Plainfield | 25 | 0 | 0 |
| Alcock Park | Frederika | 25 | 0 | 0 |
| Pine Grove Mobile Park | Waverly | 25 | 0 | 0 |
| First East Devel Water System | County of Bremer | 25 | 0 | 0 |
| Oak Highlands Water Slide | County of Bremer | 25 | 0 | 0 |
| Biemann's Olde Country Inn | County of Bremer | 25 | 0 | 0 |
| Bremer Tap | County of Bremer | 25 | 0 | 0 |
| Jolly Jakes | County of Bremer | 25 | 0 | 0 |
| Randy's Cafe & Bar | County of Bremer | 25 | 0 | 0 |
| Waverly Drive Inn | County of Bremer | 25 | 0 | 0 |
| Mccue Drive Inn | County of Bremer | 25 | 0 | 0 |
| Big Dons Restaurant | County of Bremer | 25 | 0 | 0 |
| Riviera, Inc. | County of Bremer | 25 | 0 | 0 |