850 water systems in Missouri have at least one health-based violation on record. The system with the most health-based violations is Cassie Water System in Des Peres with 331 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 |
|---|
| Cassie Water System |
Des Peres | 106 |
331 | 773 |
| Franklin Water Systems 3 |
Des Peres | 201 |
306 | 1,172 |
| South Silver Creek I II & III |
Des Peres | 291 |
176 | 284 |
| Abraxas Utilities |
Des Peres | 792 |
169 | 560 |
| Terre Du Lac |
Des Peres | 3,200 |
162 | 209 |
| Westlake Meadows Subdivision |
Cape Girardeau | 50 |
150 | 157 |
| Silex Pws |
Silex | 206 |
143 | 256 |
| Maysville Pws |
Maysville | 1,096 |
125 | 132 |
| Cs Citrus Park Water Company |
Des Peres | 102 |
124 | 233 |
| South Council Creek 2 |
Des Peres | 111 |
124 | 216 |
| Lanagan Pws |
Lanagan | 373 |
122 | 304 |
| Magnolia-Spring Creek Subdivision |
Des Peres | 444 |
115 | 158 |
| Cs El Prado Water Company |
Des Peres | 404 |
113 | 202 |
| Council Creek Village |
Des Peres | 333 |
108 | 182 |
| Live Oak Hills Subdivision |
Des Peres | 65 |
106 | 170 |
| Mosby Pws |
Mosby | 115 |
103 | 133 |
| Texas Landing Utilities |
Des Peres | 420 |
100 | 147 |
| Vista Verde Water Systems |
Des Peres | 111 |
92 | 270 |
| Monroe City Pws |
Monroe | 2,500 |
88 | 137 |
| La Playa Subdivision Water System |
Des Peres | 59 |
75 | 214 |
| Clubb Villa Senior Living |
Defiance | 110 |
63 | 96 |
| Fredericktown Pws |
Fredricktown | 4,429 |
63 | 64 |
| Cswr Southwest Garden Water |
Des Peres | 324 |
62 | 126 |
| Leadwood Pws |
Leadwood | 1,192 |
61 | 75 |
| Cs Lake Verde Water Company |
Des Peres | 169 |
56 | 168 |
| Mo American Garden City |
Joplin | 1,590 |
55 | 61 |
| Louisiana Pws |
Louisiana | 3,244 |
51 | 83 |
| Cs Tierra Mesa Estates Water Company |
Des Peres | 632 |
47 | 129 |
| Cs Rancheros Bonitos Water Company |
Des Peres | 120 |
43 | 165 |
| Bonne Terre Pws |
Bonne Terre | 3,537 |
43 | 60 |
| El Pinon Estates Water System |
Des Peres | 131 |
41 | 283 |
| Ozark County Pwsd 1 |
Theodosia | 243 |
40 | 48 |
| Farmington Pws |
Farmington | 18,217 |
40 | 47 |
| Cleveland Pws |
Cleveland | 690 |
36 | 48 |
| Blodgett Pws |
Blodgett | 300 |
34 | 134 |
| Bates County Pwsd 2 |
Amsterdam | 752 |
33 | 57 |
| Crazy Horse Ranch Water |
Des Peres | 210 |
31 | 93 |
| King City Pws |
King City | 1,100 |
31 | 36 |
| Hubert Watson Subdivision |
Des Peres | 108 |
30 | 54 |
| Mo American Ironton |
Chesterfield | 1,460 |
30 | 30 |
| Poplar Bluff Pws |
Poplar Bluff | 17,043 |
29 | 29 |
| Ralls County Pwsd 1 |
Hannibal | 7,662 |
28 | 30 |
| Cs White Hills Water Company Unit 1 |
Des Peres | 338 |
26 | 99 |
| Arrow Rock Pws |
Arrow Rock | 235 |
26 | 67 |
| Potosi Pws |
Potosi | 2,527 |
26 | 37 |
| Laf Jo Saline County Cons Pwsd 2 |
Higginsville | 7,180 |
26 | 26 |
| Ripley County Pwsd 1 West |
Doniphan | 940 |
24 | 25 |
| Millstone Luxury Condominiums |
Sunrise Beach | 400 |
23 | 41 |
| Tara Valley Homeowners Assn |
Troy | 60 |
23 | 36 |
| Blackwater Pws |
Blackwater | 181 |
22 | 52 |
| Pilot Knob Rural Wd 1 Doe Run Area |
Farmington | 507 |
22 | 42 |
| Ymca Trout Lodge & Camp Lakewood |
Potosi | 800 |
22 | 40 |
| Nelson Pws |
Nelson | 158 |
22 | 28 |
| Cs Mohawk Utility Company |
Des Peres | 243 |
21 | 506 |
| Memphis Pws |
Memphis | 1,822 |
21 | 89 |
| Saline County Pwsd 3 |
Marshall | 3,000 |
21 | 32 |
| Mercer Pws |
Mercer | 318 |
20 | 33 |
| Cooper County Consolidated Pwsd # 1 |
Boonville | 2,451 |
20 | 27 |
| Vandalia Pws |
Vandalia | 3,140 |
20 | 26 |
| Cs Verde Lee Water Company |
Des Peres | 604 |
19 | 104 |
| Lamar Pws |
Lamar | 4,500 |
19 | 32 |
| Hannibal Pws |
Hannibal | 17,108 |
19 | 30 |
| Braymer Pws |
Braymer | 878 |
18 | 83 |
| Ridgecrest Subdivsion |
Troy | 40 |
18 | 39 |
| New Franklin Pws |
New Franklin | 1,089 |
18 | 33 |
| Magnolia-Jackson Square |
Des Peres | 825 |
18 | 25 |
| Cs Green Acres Water Company |
Des Peres | 105 |
17 | 88 |
| Archie Pws |
Archie | 1,300 |
17 | 68 |
| Rosendale Pws |
Rosendale | 142 |
17 | 44 |
| 17 Eagle Stop |
Springfield | 200 |
17 | 43 |
| Magnolia-Peg Leg Cove |
Des Peres | 189 |
17 | 23 |
| Jamestowne MHP |
Mount Vernon | 46 |
16 | 191 |
| Lake Royale S/D |
Des Peres | 5,890 |
16 | 79 |
| Magnolia-Belleville Subdivision |
Des Peres | 282 |
16 | 46 |
| Lake Seven Falls Assn Inc |
St Genevieve | 475 |
16 | 26 |
| Marshall Pws |
Marshall | 12,934 |
16 | 16 |
| Bertrand Pws |
Bertrand | 733 |
15 | 170 |
| Twin Bridges Canoe and Campground |
West Plains | 25 |
15 | 51 |
| Magnolia-Western Utilities, Inc |
Des Peres | 789 |
15 | 24 |
| Caldwell County Pwsd 2 |
Kidder | 695 |
15 | 24 |
| Summersville Pws |
Summersville | 502 |
15 | 24 |
| Fayette Pws |
Fayette | 2,800 |
15 | 18 |
| Kirksville Pws |
Kirksville | 17,566 |
15 | 16 |
| Starlight Village |
Branson West | 65 |
14 | 376 |
| Ridge Creek Water Company LLC |
Saint Robert | 450 |
14 | 74 |
| Moniteau County Pwsd 1 |
Fortuna | 200 |
14 | 63 |
| Magnolia-Pilot Street |
Des Peres | 174 |
14 | 40 |
| Pettis/Johnson/Saline Pwsd 1 |
Concordia | 1,000 |
14 | 35 |
| Green Acres Homeowners Association |
Branson | 30 |
14 | 35 |
| Hunnewell Pws |
Hunnewell | 184 |
14 | 28 |
| Happy Acres |
Sedalia | 50 |
13 | 152 |
| Ocwc Redbud Briarwood |
Kimberling City | 50 |
13 | 27 |
| Elk O Vue River Park MHP |
Noel | 25 |
12 | 149 |
| Village of Mc Cord Bend |
Galena | 270 |
12 | 124 |
| Parma Pws |
Parma | 450 |
12 | 85 |
| Camp Bagnell in the Ozarks |
Eldon | 100 |
12 | 78 |
| Magnolia-Utility Service of Lake Charles |
Des Peres | 306 |
12 | 32 |
| Henry County Pwsd 1 |
Clinton | 258 |
12 | 23 |
| Waverly Pws |
Waverly | 800 |
12 | 19 |
| Keytesville Pws |
Keytesville | 500 |
12 | 19 |