Missouri Water Quality
Health violation data for 1,666 community water systems in Missouri. Based on EPA Safe Drinking Water Information System (SDWIS) data.
Water Systems
1,666
Total Violations
6,246
Systems with Violations
50
Cities with Issues
317
Water Systems with Most Violations
| # | Water System | Violations | Health |
|---|---|---|---|
| 1 | CASSIE WATER SYSTEM Des Peres | 331 | Yes |
| 2 | FRANKLIN WATER SYSTEMS 3 Des Peres | 306 | Yes |
| 3 | SOUTH SILVER CREEK I II & III Des Peres | 176 | Yes |
| 4 | ABRAXAS UTILITIES Des Peres | 169 | Yes |
| 5 | TERRE DU LAC Des Peres | 162 | Yes |
| 6 | WESTLAKE MEADOWS SUBDIVISION Cape Girardeau | 150 | Yes |
| 7 | SILEX PWS Silex | 143 | Yes |
| 8 | MAYSVILLE PWS Maysville | 125 | Yes |
| 9 | CS CITRUS PARK WATER COMPANY Des Peres | 124 | Yes |
| 10 | SOUTH COUNCIL CREEK 2 Des Peres | 124 | Yes |
| 11 | LANAGAN PWS Lanagan | 122 | Yes |
| 12 | MAGNOLIA-SPRING CREEK SUBDIVISION Des Peres | 115 | Yes |
| 13 | CS EL PRADO WATER COMPANY Des Peres | 113 | Yes |
| 14 | COUNCIL CREEK VILLAGE Des Peres | 108 | Yes |
| 15 | LIVE OAK HILLS SUBDIVISION Des Peres | 106 | Yes |
| 16 | MOSBY PWS Mosby | 103 | Yes |
| 17 | TEXAS LANDING UTILITIES Des Peres | 100 | Yes |
| 18 | VISTA VERDE WATER SYSTEMS Des Peres | 92 | Yes |
| 19 | MONROE CITY PWS Monroe | 88 | Yes |
| 20 | LA PLAYA SUBDIVISION WATER SYSTEM Des Peres | 75 | Yes |
| 21 | FREDERICKTOWN PWS Fredricktown | 63 | Yes |
| 22 | CLUBB VILLA SENIOR LIVING Defiance | 63 | Yes |
| 23 | CSWR SOUTHWEST GARDEN WATER Des Peres | 62 | Yes |
| 24 | LEADWOOD PWS Leadwood | 61 | Yes |
| 25 | CS LAKE VERDE WATER COMPANY Des Peres | 56 | Yes |
| 26 | MO AMERICAN GARDEN CITY Joplin | 55 | Yes |
| 27 | LOUISIANA PWS Louisiana | 51 | Yes |
| 28 | CS TIERRA MESA ESTATES WATER COMPANY Des Peres | 47 | Yes |
| 29 | CS RANCHEROS BONITOS WATER COMPANY Des Peres | 43 | Yes |
| 30 | BONNE TERRE PWS Bonne Terre | 43 | Yes |
| 31 | EL PINON ESTATES WATER SYSTEM Des Peres | 41 | Yes |
| 32 | FARMINGTON PWS Farmington | 40 | Yes |
| 33 | OZARK COUNTY PWSD 1 Theodosia | 40 | Yes |
| 34 | CLEVELAND PWS Cleveland | 36 | Yes |
| 35 | BLODGETT PWS Blodgett | 34 | Yes |
| 36 | BATES COUNTY PWSD 2 Amsterdam | 33 | Yes |
| 37 | KING CITY PWS King City | 31 | Yes |
| 38 | CRAZY HORSE RANCH WATER Des Peres | 31 | Yes |
| 39 | MO AMERICAN IRONTON Chesterfield | 30 | Yes |
| 40 | HUBERT WATSON SUBDIVISION Des Peres | 30 | Yes |
| 41 | POPLAR BLUFF PWS Poplar Bluff | 29 | Yes |
| 42 | RALLS COUNTY PWSD 1 Hannibal | 28 | Yes |
| 43 | CS WHITE HILLS WATER COMPANY UNIT 1 Des Peres | 26 | Yes |
| 44 | LAF JO SALINE COUNTY CONS PWSD 2 Higginsville | 26 | Yes |
| 45 | ARROW ROCK PWS Arrow Rock | 26 | Yes |
| 46 | POTOSI PWS Potosi | 26 | Yes |
| 47 | RIPLEY COUNTY PWSD 1 WEST Doniphan | 24 | Yes |
| 48 | MILLSTONE LUXURY CONDOMINIUMS Sunrise Beach | 23 | Yes |
| 49 | TARA VALLEY HOMEOWNERS ASSN Troy | 23 | Yes |
| 50 | NELSON PWS Nelson | 22 | Yes |
Most Common Contaminants in Missouri
| Contaminant | Violations | Systems Affected |
|---|---|---|
| Total Trihalomethanes (TTHM) | 1,258 | 122 |
| Lead & Copper Rule | 1,001 | 28 |
| Copper | 868 | 29 |
| Fluoride | 541 | 196 |
| Atrazine | 397 | 18 |
| Barium | 309 | 10 |
| Total Coliform (RTCR) | 308 | 84 |
| Nitrate | 296 | 7 |
| E. coli | 275 | 120 |
| Haloacetic Acids (HAA5) | 263 | 29 |
| Turbidity | 154 | 11 |
| Chlorine | 127 | 63 |
| Chloroform | 121 | 10 |
| Manganese | 88 | 3 |
| Lead (Action Level) | 83 | 2 |
Cities with Water Quality Issues
Chesterfield Fenton High Ridge Imperial Pacific Sullivan Union Washington Weldon Spring Laddonia Louisiana Troy Vandalia Warrenton Wright City Hannibal Kirksville Milan Park Hills Annapolis Bloomsdale Bonne Terre Ellington Farmington Potosi Cape Girardeau Jackson Oran Perryville Sikeston New Madrid Portageville Poplar Bluff Piedmont Concordia Excelsior Springs Holden Kansas City Richmond Weston +277 more
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About This Data
Water quality data is from the EPA Safe Drinking Water Information System (SDWIS). Health-based violations include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations. Only community water systems (CWS) in Missouri are included.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.