We found 91 public water systems in Black Hawk county (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Waterloo Water Works | Waterloo | 70,070 | 78 | 18 |
| Cedar Falls Municipal Water Utilities | Cedar Falls | 39,260 | 110 | 6 |
| Ia Regional Utilities Assoc (waverly) | Waverly | 34,245 | 87 | 2 |
| Evansdale Water Works | Evansdale | 4,751 | 0 | 3 |
| La Porte City Utilities | La Porte City | 2,285 | 0 | 7 |
| Hudson Water Supply | Hudson | 2,282 | 0 | 3 |
| Black Hawk County Rural Water | County of Black Hawk | 1,400 | 0 | 0 |
| Elk Run Heights Water Supply | Elk Run Heights | 1,117 | 0 | 5 |
| George Wyth State Park | County of Black Hawk | 1,100 | 0 | 0 |
| John Deere Co - Airport | County of Black Hawk | 1,050 | 0 | 0 |
| Country Terrace Mobile Home Park | Waterloo | 1,000 | 0 | 0 |
| John Deere Product Eng Center | County of Black Hawk | 900 | 0 | 0 |
| Dunkerton Muni Water Supply | Dunkerton | 852 | 0 | 2 |
| Raymond Water System | County of Black Hawk | 788 | 0 | 0 |
| Gilbertville Water Works | Gilbertville | 717 | 0 | 18 |
| Cedar Falls Mobile Home Village | Cedar Falls | 440 | 0 | 5 |
| Laport City A & W Restaurant | County of Black Hawk | 414 | 0 | 0 |
| Cedar Falls Raceway | County of Black Hawk | 375 | 0 | 0 |
| Five Seasons Cedar Falls | Cedar Falls | 298 | 0 | 0 |
| Lenwood Utilities | Dunkerton | 238 | 0 | 24 |
| Brown Bottle Restaurant | Cedar Falls | 225 | 0 | 0 |
| Frontier Cafe | Waterloo | 200 | 0 | 0 |
| St Joseph School | County of Black Hawk | 200 | 0 | 0 |
| Sky View Terrace | County of Black Hawk | 173 | 0 | 0 |
| Smittys Mobile Home Village | County of Black Hawk | 160 | 0 | 0 |
| Pheasant Ridge Pro Shop | Cedar Falls | 155 | 0 | 5 |
| Sunset Trailer Court | County of Black Hawk | 150 | 0 | 0 |
| Land-o-lakes | County of Black Hawk | 135 | 0 | 0 |
| St Francis Barclay Church | Dunkerton | 132 | 0 | 0 |
| Waterloo Implement | Hudson | 130 | 0 | 0 |
| Robinson-dresser Sports Complex | Cedar Falls | 128 | 0 | 1 |
| Green Acres Mobile Home Village I | Cedar Falls | 125 | 0 | 0 |
| High Acres Mobile Park | County of Black Hawk | 122 | 0 | 0 |
| Oak Grove Park | La Porte City | 110 | 0 | 0 |
| Eagle Center Tap | Waterloo | 108 | 0 | 0 |
| Beaver Hills Country Club | Cedar Falls | 107 | 0 | 0 |
| John Deere Co Supervisor Club | Waterloo | 103 | 0 | 0 |
| Woodland Estates | County of Black Hawk | 100 | 0 | 0 |
| Extreme Food & Spirit Ltd. | County of Black Hawk | 100 | 0 | 0 |
| Green Acres Mobile Home Village Ii | County of Black Hawk | 99 | 0 | 0 |
| Cedar Valley Golf Center | Waterloo | 94 | 0 | 0 |
| Prairie View Acres Mhp | Waterloo | 92 | 0 | 0 |
| Hickory Hills Park (east) | Waterloo | 85 | 0 | 0 |
| Orrie's Supper Club & Residential Area | Voorhies | 78 | 0 | 0 |
| Moose Lodge #388 | Washburn | 77 | 0 | 0 |
| Family Mart | County of Black Hawk | 75 | 0 | 0 |
| YWCA-CAMP WAHPETON | County of Black Hawk | 75 | 0 | 0 |
| Country Inn And Motel | County of Black Hawk | 65 | 0 | 0 |
| Universal Ind | County of Black Hawk | 65 | 0 | 0 |
| Lakeview Drive Well | County of Black Hawk | 63 | 0 | 0 |
| Swiss Valley Farms Company | County of Black Hawk | 60 | 0 | 0 |
| Doerfer Engineering Company | Cedar Falls | 60 | 0 | 0 |
| Blackhawk Pk-blackhawk Conserv | Cedar Falls | 58 | 0 | 0 |
| Cedar Valley Arboretum & Botanical Grdns | Waterloo | 56 | 0 | 0 |
| Assink Brothers | County of Black Hawk | 53 | 0 | 0 |
| Dewar Tap & Restaurant | County of Black Hawk | 53 | 0 | 0 |
| Deluxe Mobile Home Court | County of Black Hawk | 50 | 0 | 0 |
| Louie's Inn | County of Black Hawk | 50 | 0 | 0 |
| Barclay Presbyterian Church | Dunkerton | 50 | 0 | 0 |
| Raymond Road Trailer Court | County of Black Hawk | 50 | 0 | 0 |
| Farmstead Preschool | Cedar Falls | 50 | 0 | 0 |
| Kathys Korner | Dewar | 50 | 0 | 0 |
| Cedar Valley Child Care Center | County of Black Hawk | 50 | 0 | 0 |
| Golden Acres Retirement Village | Waterloo | 49 | 0 | 0 |
| Order Of Eagles/aerie 4074 | Cedar Falls | 42 | 0 | 0 |
| Izaak Walton Club House | County of Black Hawk | 40 | 0 | 0 |
| Voorhies Water System | County of Black Hawk | 40 | 0 | 0 |
| La Porte City Golf Club | La Porte City | 40 | 0 | 0 |
| Island Park Beach House | Cedar Falls | 40 | 0 | 0 |
| Mcfarlane Park | La Porte City | 40 | 0 | 0 |
| Barn Happy | Cedar Falls | 39 | 0 | 0 |
| Kay Enterprises Inc | Janesville | 35 | 0 | 0 |
| St. Mary Of Carmel | County of Black Hawk | 35 | 0 | 0 |
| Budget Motel | County of Black Hawk | 35 | 0 | 0 |
| Airline Motel | County of Black Hawk | 35 | 0 | 0 |
| Fobians M & J | Cedar Falls | 32 | 0 | 0 |
| Siggelkov Pk-blackhawk Consrvn | County of Black Hawk | 30 | 0 | 0 |
| American Martyrs Retreat House | Cedar Falls | 28 | 0 | 0 |
| Antique Acres | Cedar Falls | 28 | 0 | 0 |
| Good Times Motel | County of Black Hawk | 25 | 0 | 0 |
| Cedar River Acc-blackhawk Cons | County of Black Hawk | 25 | 0 | 0 |
| Rath Packing Co | County of Black Hawk | 25 | 0 | 0 |
| Winnebago Council,b.s.of Ameri | County of Black Hawk | 25 | 0 | 0 |
| Sergeant Mem Ra-blackhawk Cons | County of Black Hawk | 25 | 0 | 0 |
| Swiss Valley Farms Company | County of Black Hawk | 25 | 0 | 0 |
| Cedar River Natural Resource Area | Waterloo | 25 | 0 | 0 |
| Popp Acc-black Hawk Conservati | County of Black Hawk | 25 | 0 | 0 |
| Thunder Woman Pk-black Hawk Co | County of Black Hawk | 25 | 0 | 0 |
| Perry Canfield Pk-blackhawk Co | County of Black Hawk | 25 | 0 | 0 |
| Watkin's Tavern | County of Black Hawk | 25 | 0 | 0 |
| Clete & Donna's Place | County of Black Hawk | 25 | 0 | 0 |