283 water systems in Iowa have at least one health-based violation on record. The system with the most health-based violations is Chariton Municipal Water Works in Chariton with 82 health-based violations. Health-based violations mean a system exceeded an EPA maximum contaminant level or failed required treatment standards.
| Water System | City | Population | Health Violations | Total Violations |
|---|
| Chariton Municipal Water Works |
Chariton | 4,381 |
82 | 110 |
| Lazy T Campground |
Manchester | 25 |
63 | 75 |
| Mallard Water Supply |
Mallard | 257 |
52 | 65 |
| Mcbride Pointe Third Master Maintenance |
Oxford | 25 |
50 | 65 |
| Town Clock |
Peosta | 158 |
38 | 70 |
| Iowa Valley Estates |
Marengo | 46 |
35 | 35 |
| Grinnell Water Department |
Grinnell | 9,564 |
33 | 42 |
| Lanesboro Water Works |
Fort Dodge | 119 |
33 | 37 |
| Knierim Water Supply |
Fort Dodge | 53 |
25 | 25 |
| Gallery Acres West |
Tipton | 43 |
23 | 32 |
| Leon Water Supply |
Leon | 1,830 |
22 | 33 |
| Hastings Water Supply |
Marshalltown | 152 |
22 | 27 |
| The Balk Tank |
Waucoma | 25 |
19 | 24 |
| Little Brown Church |
Nashua | 183 |
19 | 20 |
| Pine Creek Golf Course |
Mason City | 55 |
17 | 69 |
| Dedham Water Supply |
Dedham | 221 |
16 | 97 |
| Dyersville Municipal Water Co |
Dyersville | 4,477 |
16 | 21 |
| Poet Biorefining (Coon Rapids) |
Coon Rapids | 57 |
15 | 15 |
| Joe Sheldon Park-Humboldt Ccb |
Dakota City | 52 |
14 | 15 |
| Lehigh Water Supply |
Fort Dodge | 395 |
14 | 14 |
| Deese Thirsty Camel |
Columbus JCT | 67 |
13 | 38 |
| Osceola Water Works |
Osceola | 5,503 |
13 | 18 |
| Sac & Fox (Meskwaki) in Iowa |
Tama | 4,765 |
12 | 35 |
| Donnellson Muni Water Works |
Donnellson | 885 |
12 | 28 |
| Sears 66 Service |
Elkport | 28 |
11 | 15 |
| Iowa Army Ammunition Plant |
Middletown | 1,100 |
11 | 11 |
| Early Municipal Water Supply |
Early | 587 |
11 | 11 |
| Sioux City Water Supply |
Sioux City | 85,791 |
10 | 21 |
| Hartwick Point Well |
Delhi | 120 |
10 | 10 |
| Papas Paradise Campground |
Fruitland | 27 |
9 | 87 |
| Westfair |
Council Bluffs | 238 |
9 | 65 |
| Bristow Muni Water Supply |
Bristow | 145 |
9 | 9 |
| K-Town Tap |
Cresco | 25 |
8 | 66 |
| Luckys Last Resort Campground |
Plymouth | 105 |
8 | 40 |
| Corridor Ridge Subdivision |
Walford | 108 |
8 | 15 |
| Preston Valley Golf |
Preston | 100 |
7 | 45 |
| Buffalo Run Golf Club |
Nora Springs | 51 |
7 | 40 |
| Town & Country Aqua Club |
Council Bluffs | 30 |
7 | 29 |
| Maple Grove Mhc |
Madrid | 160 |
7 | 22 |
| Kesslers Homeowners Assn |
Iowa City | 60 |
7 | 9 |
| Boone Water Works |
Boone | 12,704 |
7 | 8 |
| Plover Water Supply |
Whittemore | 50 |
7 | 8 |
| Rolling Knolls Golf Course |
Dyersville | 118 |
6 | 130 |
| Rice Lake Golf & Country Club |
Lake Mills | 100 |
6 | 84 |
| Camp Ingawanis-Maple and Ranger Well |
Waterloo | 402 |
6 | 56 |
| Massena Water Supply |
Massena | 364 |
6 | 41 |
| Camp Shalom |
Maquoketa | 120 |
6 | 39 |
| Lamoni Municipal Utilities |
Lamoni | 2,104 |
6 | 30 |
| The Grove |
Monticello | 31 |
6 | 20 |
| Toledo Water Supply |
Toledo | 2,399 |
6 | 17 |
| Mid River Marina |
Swisher | 31 |
6 | 17 |
| Blackbird Bend Casino |
Onawa | 546 |
6 | 14 |
| Carpenter Bar/Grill |
Carpenter | 52 |
6 | 6 |
| Jamaica Water Supply |
Jamaica | 195 |
5 | 47 |
| Under the Stars at Chimney Rock Cg LLC |
Decorah | 33 |
5 | 34 |
| Bs General Store LLC |
Camanche | 27 |
5 | 26 |
| Card, Inc. |
Clarksville | 50 |
5 | 16 |
| Calkins Nature Center |
Ackley | 27 |
5 | 10 |
| P.M. Park Trustees-East |
Clear Lake | 152 |
5 | 9 |
| Waldenburg Community Water System |
Oxford | 90 |
5 | 9 |
| Fairbank Water Supply |
Fairbank | 1,111 |
5 | 6 |
| Bellevue Municipal Utilities |
Bellevue | 2,363 |
5 | 5 |
| Burr Oak Lutheran Church |
Decorah | 50 |
5 | 5 |
| US Nameplate Company Inc |
Mount Vernon | 65 |
4 | 260 |
| Starmont Community School District |
Arlington | 742 |
4 | 139 |
| Deerwood Golf Inc |
New London | 306 |
4 | 42 |
| Windmill Ridge Campground |
Kalona | 27 |
4 | 29 |
| Triple Play LLC |
Cedar Rapids | 400 |
4 | 26 |
| Sheldahl Water Supply |
Sheldahl | 307 |
4 | 16 |
| Lazy Susan Campground |
Holy Cross | 70 |
4 | 14 |
| Laz Club Inc Drilled Well |
Davenport | 60 |
4 | 11 |
| Woodward Water Supply |
Woodward | 1,346 |
4 | 10 |
| Keystone Water Supply |
Keystone | 599 |
4 | 9 |
| Corning Muni Water Department |
Corning | 1,735 |
4 | 8 |
| Yankee Grove Hoa |
Oxford | 64 |
4 | 8 |
| Winnavegas Casino |
Sloan | 1,576 |
4 | 7 |
| Apostolic Christian Church |
West Bend | 200 |
4 | 5 |
| P & K Midwest (Mt Vernon) |
Oxford | 82 |
4 | 5 |
| Riverview Ridge Campgrounds |
Cascade | 80 |
4 | 4 |
| Glenn Oaks Addition |
Cedar Rapids | 58 |
3 | 189 |
| Corner Market |
Mccausland | 252 |
3 | 46 |
| Burts Tavern |
Nichols | 32 |
3 | 37 |
| Silvercrest Golf & Country Club, Inc. |
Decorah | 88 |
3 | 35 |
| Zearing Water Department |
Zearing | 528 |
3 | 28 |
| Hitchcock House |
Lewis | 216 |
3 | 25 |
| Oak Ridge Lake Estates |
Cedar Rapids | 88 |
3 | 22 |
| Spring Lake Campground |
Burlington | 25 |
3 | 19 |
| Highland General Store & Campground |
Highlandville | 59 |
3 | 17 |
| Cedarcrest Golf & Country Club |
Columbus Junction | 146 |
3 | 16 |
| Altoona Water Supply |
Altoona | 19,565 |
3 | 15 |
| The Junction Bar & Grill |
Riverside | 72 |
3 | 15 |
| Dairy Mart |
Ainsworth | 62 |
3 | 15 |
| Clarmond Country Club |
Clarion | 35 |
3 | 14 |
| Bsa-Loud Thunder Upper |
Davenport | 50 |
3 | 13 |
| Fremont Golf Course |
Sidney | 129 |
3 | 12 |
| Slater Muni Water Dept |
Slater | 1,548 |
3 | 10 |
| Monticello Jellystone Park |
Monicello | 153 |
3 | 10 |
| East Mills School |
Glenwood Ia | 285 |
3 | 9 |
| Monticello Jellystone Park II |
Monicello | 50 |
3 | 9 |
| Outback Canoe Rental |
Monticello | 27 |
3 | 9 |