EPA EXPORT · 13 SEP 2026FEDERAL COMPLIANCE RECORDS · NOT A HOME WATER TEST
TAP WATERLEDGERPublic system compliance records

STATE / TERRITORY LEDGER

Iowa drinking water system records

EPA compliance fields for active community water systems reporting at least 2,500 people served.

Systems167active CWS · pop. 2,500+
Population served2,531,099reported total; may overlap
Current violation flag4.8%8 systems
Serious-violator flag0.6%1 systems

01 / LARGEST SYSTEMS

Community water systems in Iowa

Population served is a system-reported service figure. It is not a count of unique state residents.

Water systemPopulation servedPrimary sourceCurrent export status
Des Moines Water WorksIA7727031246,055Surface water purchasedNo current violation flagged
Iowa-American Wtr Co-DavenportIA8222001147,720Surface waterNo current violation flagged
Cedar Rapids Water DepartmentIA5715093142,364Groundwater under influence of surface waterNo current violation flagged
Sioux City Water SupplyIA977805485,791Groundwater under influence of surface waterNo current violation flagged
Ankeny, City OfIA770905376,207Surface water purchasedNo current violation flagged
West Des Moines Water WorksIA778500773,959Surface water purchasedNo current violation flagged
Waterloo Water WorksIA079007469,504Ground waterNo current violation flagged
Iowa City Water DepartmentIA522507968,753Surface waterNo current violation flagged
Council Bluffs Water WorksIA782008064,447Surface waterNo current violation flagged
Dubuque Water WorksIA312605259,667Ground waterNo current violation flagged
Ames Water Treatment PlantIA850303955,177Ground waterNo current violation flagged
Urbandale Water UtilityIA778004245,605Surface water purchasedNo current violation flagged
IsuIA850352842,000Ground water purchasedNo current violation flagged
Marion Municipal Water DeptIA575103541,623Ground waterNo current violation flagged
Cedar Falls Municipal Water UtilitiesIA070908440,713Ground waterNo current violation flagged
Ia Regional Utilities Assoc (Waverly)IA099070137,820Ground waterNo current violation flagged
Rathbun Regional Water Assn (Rathbun)IA040090033,000Surface waterNo current violation flagged
Waukee Water SupplyIA257308031,823Surface water purchasedNo current violation flagged
Marshalltown Water WorksIA646904227,680Ground waterNo current violation flagged
Mason City Water DepartmentIA175004827,338Ground waterNo current violation flagged
University Water SystemIA522510126,684Surface waterNo current violation flagged
Burlington Municipal WaterworksIA290905326,015Surface waterNo current violation flagged
Fort Dodge Water SupplyIA943305025,874Ground waterNo current violation flagged
Ottumwa Water WorksIA908301225,529Surface waterNo current violation flagged
Muscatine Power & WaterIA704800125,516Ground waterNo current violation flagged
Johnston Municipal Water SupplyIA774001124,897Surface water purchasedNo current violation flagged
Iowa-American Wtr Co-Clinton DistrictIA232604824,769Ground waterNo current violation flagged
North Liberty Water SupplyIA525207223,276Ground waterNo current violation flagged
Coralville Muni Water SystemIA520807122,318Ground waterNo current violation flagged
Sirwa #2 (Creston)IA808070120,793Surface waterNo current violation flagged
Clive Water DepartmentIA772005120,277Surface water purchasedNo current violation flagged
Warren Water DistrictIA913370120,095Surface water purchasedNo current violation flagged
Altoona Water SupplyIA770703019,565Ground waterNo current violation flagged
Grimes Water SupplyIA773601117,809Ground waterNo current violation flagged
Wapello Rural Water Assoc.IA900074217,263Surface water purchasedNo current violation flagged
Newton Water SupplyIA505906416,518Ground waterNo current violation flagged
Indianola Water SupplyIA913307515,833Ground waterOther current violation flag
Norwalk Water SupplyIA916407814,334Surface water purchasedNo current violation flagged
Poweshiek Water AssociationIA867070113,920Ground waterNo current violation flagged
Xenia Rwd (Des Moines)IA257370112,860Surface water purchasedNo current violation flagged
Oskaloosa Municipal Water DeptIA627300512,808Groundwater under influence of surface waterNo current violation flagged
Boone Water WorksIA081903312,704Groundwater under influence of surface waterNo current violation flagged
Rathbun Reg Water Assn (Ft Madison)IA040090111,840Surface water purchasedNo current violation flagged
Storm Lake Water Treatment PlantIA117809711,431Ground waterNo current violation flagged
Spencer Municipal Water UtilityIA217107111,325Ground waterNo current violation flagged
Ft Madison Muni Water WorksIA562506211,087Ground waterNo current violation flagged
Pella Water Works DepartmentIA636803311,052Ground waterNo current violation flagged
Lemars Water DepartmentIA754017410,606Ground waterNo current violation flagged
Waverly Water DepartmentIA099008510,394Ground waterNo current violation flagged
Carroll Municipal Water SupplyIA141507210,184Ground waterNo current violation flagged
Keokuk Municipal Water WorksIA56400199,900Surface waterNo current violation flagged
Fairfield Water SupplyIA51310339,821Ground waterNo current violation flagged
Mahaska Rural Water System, Inc.IA62739019,818Ground waterNo current violation flagged
Grinnell Water DepartmentIA79300089,564Ground waterCurrent serious-violator flag
Bondurant Muni Water SupplyIA77170329,393Surface water purchasedNo current violation flagged
Denison Water SupplyIA24240279,381Ground waterNo current violation flagged
Mount Pleasant Municipal UtilitiesIA44530169,274Ground waterNo current violation flagged
Iowa Lakes Regional Water - OsgoodIA30600019,021Surface water purchasedNo current violation flagged
Knoxville Water WorksIA63420368,400Ground waterNo current violation flagged
Rathbun Reg Wtr Assn (Burlington)IA04009028,375Surface water purchasedNo current violation flagged
Sioux Center Municipal Water DepartmentIA84860538,231Ground waterNo current violation flagged
Perry Municipal Water WorksIA25610367,836Ground waterNo current violation flagged
Webster City Water SupplyIA40630947,825Ground waterNo current violation flagged
Clear Lake Water DepartmentIA17160767,687Ground waterNo current violation flagged
Decorah Water DepartmentIA96300127,615Ground waterNo current violation flagged
Tiffin Water SupplyIA52880217,577Ground waterNo current violation flagged
Southeast Polk RwdIA77747017,565Surface water purchasedNo current violation flagged
Creston Water SupplyIA88160897,536Surface waterNo current violation flagged
Charles City Water SupplyIA34050127,446Ground waterNo current violation flagged
Washington Water DepartmentIA92710687,362Ground waterNo current violation flagged
Atlantic Municipal UtilitiesIA15090747,252Ground waterNo current violation flagged
Hiawatha Water DeptIA57350457,183Ground waterNo current violation flagged
Osceola Rural Water System-NorthIA72277017,002Ground waterNo current violation flagged
Nevada Water SupplyIA85620446,925Ground waterNo current violation flagged
Iowa Lakes Regional WaterIA21007016,755Ground waterNo current violation flagged
Eldridge Water SupplyIA82300086,726Ground waterNo current violation flagged
Polk City Water SupplyIA77700506,533Surface water purchasedNo current violation flagged
Adel Municipal Water WorksIA25030036,461Ground waterNo current violation flagged
Orange City Municipal Water DepartmentIA84740976,267Ground waterNo current violation flagged
Spirit Lake WaterworksIA30700786,167Surface waterNo current violation flagged
Maquoketa Municipal WaterIA49500296,128Ground waterOther current violation flag
Xenia Rwd (North)IA94257016,122Ground waterNo current violation flagged
Independence Water DeptIA10370706,064Ground waterNo current violation flagged
Asbury Municipal Water SystemIA31020015,943Ground waterNo current violation flagged
Oelwein Municipal Water WorksIA33530885,920Ground waterNo current violation flagged
Estherville Water Treatment PlantIA32180245,904Ground waterNo current violation flagged
Marion Co. Rural Water DistrictIA63427115,687Ground water purchasedOther current violation flag
Red Oak Water SupplyIA69500755,596Ground waterNo current violation flagged
De Witt Water SupplyIA23300365,514Ground waterNo current violation flagged
Sheldon Water DepartmentIA71700405,512Ground waterNo current violation flagged
Osceola Water WorksIA20380385,503Surface waterOther current violation flag
Algona Municipal UtilitiesIA55020155,487Ground waterNo current violation flagged
Glenwood Municipal UtilitiesIA65250905,449Ground waterNo current violation flagged
Winterset Municipal WaterworksIA61710295,428Surface waterNo current violation flagged
Southern Sioux County Rural WaterIA84007335,420Ground waterNo current violation flagged
Centerville Municipal WaterworksIA04070085,344Surface water purchasedNo current violation flagged
Cherokee Water Supply - Plant 1IA18110205,199Ground waterNo current violation flagged
Iowa Falls Water DepartmentIA42600975,146Ground waterNo current violation flagged
Manchester Water SupplyIA28390215,077Ground waterNo current violation flagged
Harlan Municipal UtilitiesIA83350295,067Ground waterNo current violation flagged

Showing the 100 largest systems by reported population served.

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