U.S. safety records, as the agencies wrote them. Independent.
Tap water

Missouri: drinking water systems

The 1,434 active community water systems in Missouri on EPA's record, serving 5,712,206 people (EPA's counts). Systems serving more than 500 people have their own page; find yours by name, city, county, ZIP code or PWS ID. EPA's file dated Oct. 23, 2026.

164

164 of 1,434 systems have a health-based violation on EPA's record since Oct. 23, 2023, serving 257,647 of the state's 5,712,206 people (5%); 24 are an EPA enforcement priority. EPA lists 20 as currently in violation (EPA's system file of Oct. 23, 2026).

Health-based violations, in EPA's words: “Violations of maximum contaminant levels (MCLs) or maximum residual disinfectant levels (MRDLs), which specify the highest concentrations of contaminants or disinfectants, respectively, allowed in drinking water; or of treatment technique (TT) rules, which specify required processes intended to reduce the amounts of contaminants in drinking water. MCLs, MRDLs, and treatment technique rules are all health-based drinking water standards.”

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    Health-based violations since Oct. 23, 2023, by contaminant or rule

    TTHM113Groundwater Rule79Revised Total Coliform Rule56Total Haloacetic Acids (HAA5)41Combined Radium (-226 and -228)39Stage 1 Disinfectants and Disinfection Byproducts Rule23CARBON, TOTAL21Interim Enhanced Surface Water Treatment Rule9

    Cities and counties EPA lists, A to Z

    The cities EPA lists as served by each system, with the number of systems that list each; a system for which EPA lists no city is under its county.

    ALBANY 2ALTON 2Andrew (county) 1Atchison (county) 1Barry (county) 14Barton (county) 2Bates (county) 7BELTON 4Benton (county) 17BETHANY 2BLOOMFIELD 2BOLIVAR 4Boone (county) 1BOONVILLE 2BOWLING GREEN 2BRANSON 9BROOKFIELD 2BRUNSWICK 2Butler (county) 4Caldwell (county) 3CALIFORNIA 2Callaway (county) 3Camden (county) 53CAMDENTON 6CAPE GIRARDEAU 4Cape Girardeau (county) 11CARL JUNCTION 2Carroll (county) 1CARROLLTON 2Carter (county) 1Cass (county) 8Cedar (county) 5CENTRALIA 2CHAFFEE 2CHILLICOTHE 4Christian (county) 15Clay (county) 2CLINTON 2Clinton (county) 1Cole (county) 3COLUMBIA 5Crawford (county) 6CROCKER 2Dade (county) 1Daviess (county) 2DEARBORN 2DeKalb (county) 2DEXTER 4DONIPHAN 2Dunklin (county) 2EDGERTON 2FARMINGTON 2FORDLAND 2FORISTELL 2Franklin (county) 31FREDERICKTOWN 2FULTON 2Gasconade (county) 4Gentry (county) 1GLASGOW 2GRAIN VALLEY 2GRANT CITY 3Greene (county) 9HALLSVILLE 2Harrison (county) 1HARRISONVILLE 3HAYTI 2Henry (county) 2HOLDEN 2Holt (county) 1HOUSTON 3Howard (county) 1Howell (county) 2Iron (county) 2JACKSON 2Jackson (county) 8Jasper (county) 2Jefferson (county) 59JEFFERSON CITY 4Johnson (county) 5KANSAS CITY 2KEARNEY 3KIRKSVILLE 2KS 2Lafayette (county) 4LATHROP 3Lawrence (county) 2LAWSON 2LEBANON 4LEES SUMMIT 3LIBERTY 4LICKING 2Lincoln (county) 27LINN 2MACON 2MARBLE HILL 2MARSHALL 3MARYVILLE 3McDonald (county) 4MEMPHIS 2MEXICO 2Miller (county) 8Mississippi (county) 1MOBERLY 2Monroe (county) 1Montgomery (county) 4Morgan (county) 9NEVADA 2New Madrid (county) 2Newton (county) 1NIXA 5Nodaway (county) 2ODESSA 2PARIS 2PARK HILLS 3PARKVILLE 3PECULIAR 2Pemiscot (county) 1PERRY 2Perry (county) 3PERRYVILLE 4Pettis (county) 9Phelps (county) 6Platte (county) 2PLATTE CITY 2PLEASANT HILL 3Polk (county) 3POLO 3Pulaski (county) 6Putnam (county) 1Ralls (county) 1Ray (county) 1RAYTOWN 2RICHMOND 2Ripley (county) 2ROLLA 6SALEM 2Saline (county) 1SAVANNAH 2Scott (county) 5SENATH 2SHELBYVILLE 2SLATER 2SMITHVILLE 2St. Charles (county) 10St. Clair (county) 1St. Francois (county) 12St. Louis (county) 4STE. GENEVIEVE 4Ste. Genevieve (county) 1Stoddard (county) 2Stone (county) 66Sullivan (county) 1Taney (county) 33TRENTON 2UNIONVILLE 3URICH 2VAN BUREN 2Warren (county) 13WARRENSBURG 3WASHINGTON 2Washington (county) 7Wayne (county) 7WAYNESVILLE 4WEBB CITY 2Webster (county) 5WEST PLAINS 2WESTON 3WILLOW SPRINGS 2Wright (county) 2

    Counties

    A page for each county EPA lists for three or more systems with a page of their own: the systems that serve it and how each stands on EPA's record.

    Andrew County 11Atchison County 7Audrain County 7Barry County 30Barton County 5Bates County 15Benton County 25Boone County 12Butler County 12Caldwell County 11Callaway County 11Camden County 65Cape Girardeau County 21Carroll County 7Carter County 6Cass County 33Cedar County 10Chariton County 5Christian County 29Clay County 22Clinton County 10Cole County 12Cooper County 8Crawford County 11Dade County 7Daviess County 12DeKalb County 9Dunklin County 13Franklin County 41Gasconade County 10Gentry County 7Greene County 29Harrison County 9Henry County 12Holt County 8Howard County 6Howell County 9Iron County 10Jackson County 24Jasper County 18Jefferson County 68Johnson County 16Laclede County 6Lafayette County 15Lawrence County 13Lewis County 5Lincoln County 32Linn County 9Livingston County 8Macon County 7Marion County 3McDonald County 10Miller County 15Mississippi County 6Moniteau County 7Monroe County 5Montgomery County 13Morgan County 15New Madrid County 14Newton County 15Nodaway County 13Oregon County 5Osage County 12Pemiscot County 7Perry County 10Pettis County 21Phelps County 15Pike County 6Platte County 20Polk County 14Pulaski County 16Putnam County 4Ralls County 4Randolph County 5Ray County 9Ripley County 5Saline County 13Scott County 16Shannon County 3Shelby County 5St. Charles County 19St. Clair County 6St. Francois County 21St. Louis County 6Ste. Genevieve County 8Stoddard County 16Stone County 93Sullivan County 7Taney County 54Texas County 10Vernon County 9Warren County 18Washington County 11Wayne County 15Webster County 12Wright County 7
    Water systems with a page of their own, A to Z (644)

    From EPA's Safe Drinking Water Information System (SDWIS), through EPA ECHO's drinking water system download. Health-based violations from EPA Envirofacts, downloaded Nov. 2, 2026. EPA's file dated Oct. 23, 2026. EPA: “All compliance and enforcement data displayed on ECHO are current as of the last official quarterly refresh of the source data system, SDWIS, which may lag by three to six months.” These are records of violations, not a test of your tap water today: your water system's annual Consumer Confidence Report has its test results. Names and values are shown as EPA writes them. EPA ECHO drinking water search.