STATE / TERRITORY LEDGER
Iowa drinking water system records
EPA’s September 2026 export lists 167 active community water systems in Iowa, with 8 current-violation flags and 1 serious-violator flags among covered systems serving at least 2,500 people.
Source: EPA SDWIS system-search export · Active community systems · Snapshot 13 Sep 2026
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
Iowa community water systems
EPA’s covered Iowa records include 167 active community systems reporting a combined population-served total of 2,531,099, which may overlap.
Population served is a system-reported service figure. It is not a count of unique state residents.
| Water system | Population served | Primary source | Current export status |
|---|---|---|---|
| Des Moines Water WorksIA7727031 | 246,055 | Surface water purchased | No current violation flagged |
| Iowa-American Wtr Co-DavenportIA8222001 | 147,720 | Surface water | No current violation flagged |
| Cedar Rapids Water DepartmentIA5715093 | 142,364 | Groundwater under influence of surface water | No current violation flagged |
| Sioux City Water SupplyIA9778054 | 85,791 | Groundwater under influence of surface water | No current violation flagged |
| Ankeny, City OfIA7709053 | 76,207 | Surface water purchased | No current violation flagged |
| West Des Moines Water WorksIA7785007 | 73,959 | Surface water purchased | No current violation flagged |
| Waterloo Water WorksIA0790074 | 69,504 | Ground water | No current violation flagged |
| Iowa City Water DepartmentIA5225079 | 68,753 | Surface water | No current violation flagged |
| Council Bluffs Water WorksIA7820080 | 64,447 | Surface water | No current violation flagged |
| Dubuque Water WorksIA3126052 | 59,667 | Ground water | No current violation flagged |
| Ames Water Treatment PlantIA8503039 | 55,177 | Ground water | No current violation flagged |
| Urbandale Water UtilityIA7780042 | 45,605 | Surface water purchased | No current violation flagged |
| IsuIA8503528 | 42,000 | Ground water purchased | No current violation flagged |
| Marion Municipal Water DeptIA5751035 | 41,623 | Ground water | No current violation flagged |
| Cedar Falls Municipal Water UtilitiesIA0709084 | 40,713 | Ground water | No current violation flagged |
| Ia Regional Utilities Assoc (Waverly)IA0990701 | 37,820 | Ground water | No current violation flagged |
| Rathbun Regional Water Assn (Rathbun)IA0400900 | 33,000 | Surface water | No current violation flagged |
| Waukee Water SupplyIA2573080 | 31,823 | Surface water purchased | No current violation flagged |
| Marshalltown Water WorksIA6469042 | 27,680 | Ground water | No current violation flagged |
| Mason City Water DepartmentIA1750048 | 27,338 | Ground water | No current violation flagged |
| University Water SystemIA5225101 | 26,684 | Surface water | No current violation flagged |
| Burlington Municipal WaterworksIA2909053 | 26,015 | Surface water | No current violation flagged |
| Fort Dodge Water SupplyIA9433050 | 25,874 | Ground water | No current violation flagged |
| Ottumwa Water WorksIA9083012 | 25,529 | Surface water | No current violation flagged |
| Muscatine Power & WaterIA7048001 | 25,516 | Ground water | No current violation flagged |
| Johnston Municipal Water SupplyIA7740011 | 24,897 | Surface water purchased | No current violation flagged |
| Iowa-American Wtr Co-Clinton DistrictIA2326048 | 24,769 | Ground water | No current violation flagged |
| North Liberty Water SupplyIA5252072 | 23,276 | Ground water | No current violation flagged |
| Coralville Muni Water SystemIA5208071 | 22,318 | Ground water | No current violation flagged |
| Sirwa #2 (Creston)IA8080701 | 20,793 | Surface water | No current violation flagged |
| Clive Water DepartmentIA7720051 | 20,277 | Surface water purchased | No current violation flagged |
| Warren Water DistrictIA9133701 | 20,095 | Surface water purchased | No current violation flagged |
| Altoona Water SupplyIA7707030 | 19,565 | Ground water | No current violation flagged |
| Grimes Water SupplyIA7736011 | 17,809 | Ground water | No current violation flagged |
| Wapello Rural Water Assoc.IA9000742 | 17,263 | Surface water purchased | No current violation flagged |
| Newton Water SupplyIA5059064 | 16,518 | Ground water | No current violation flagged |
| Indianola Water SupplyIA9133075 | 15,833 | Ground water | Other current violation flag |
| Norwalk Water SupplyIA9164078 | 14,334 | Surface water purchased | No current violation flagged |
| Poweshiek Water AssociationIA8670701 | 13,920 | Ground water | No current violation flagged |
| Xenia Rwd (Des Moines)IA2573701 | 12,860 | Surface water purchased | No current violation flagged |
| Oskaloosa Municipal Water DeptIA6273005 | 12,808 | Groundwater under influence of surface water | No current violation flagged |
| Boone Water WorksIA0819033 | 12,704 | Groundwater under influence of surface water | No current violation flagged |
| Rathbun Reg Water Assn (Ft Madison)IA0400901 | 11,840 | Surface water purchased | No current violation flagged |
| Storm Lake Water Treatment PlantIA1178097 | 11,431 | Ground water | No current violation flagged |
| Spencer Municipal Water UtilityIA2171071 | 11,325 | Ground water | No current violation flagged |
| Ft Madison Muni Water WorksIA5625062 | 11,087 | Ground water | No current violation flagged |
| Pella Water Works DepartmentIA6368033 | 11,052 | Ground water | No current violation flagged |
| Lemars Water DepartmentIA7540174 | 10,606 | Ground water | No current violation flagged |
| Waverly Water DepartmentIA0990085 | 10,394 | Ground water | No current violation flagged |
| Carroll Municipal Water SupplyIA1415072 | 10,184 | Ground water | No current violation flagged |
| Keokuk Municipal Water WorksIA5640019 | 9,900 | Surface water | No current violation flagged |
| Fairfield Water SupplyIA5131033 | 9,821 | Ground water | No current violation flagged |
| Mahaska Rural Water System, Inc.IA6273901 | 9,818 | Ground water | No current violation flagged |
| Grinnell Water DepartmentIA7930008 | 9,564 | Ground water | Current serious-violator flag |
| Bondurant Muni Water SupplyIA7717032 | 9,393 | Surface water purchased | No current violation flagged |
| Denison Water SupplyIA2424027 | 9,381 | Ground water | No current violation flagged |
| Mount Pleasant Municipal UtilitiesIA4453016 | 9,274 | Ground water | No current violation flagged |
| Iowa Lakes Regional Water - OsgoodIA3060001 | 9,021 | Surface water purchased | No current violation flagged |
| Knoxville Water WorksIA6342036 | 8,400 | Ground water | No current violation flagged |
| Rathbun Reg Wtr Assn (Burlington)IA0400902 | 8,375 | Surface water purchased | No current violation flagged |
| Sioux Center Municipal Water DepartmentIA8486053 | 8,231 | Ground water | No current violation flagged |
| Perry Municipal Water WorksIA2561036 | 7,836 | Ground water | No current violation flagged |
| Webster City Water SupplyIA4063094 | 7,825 | Ground water | No current violation flagged |
| Clear Lake Water DepartmentIA1716076 | 7,687 | Ground water | No current violation flagged |
| Decorah Water DepartmentIA9630012 | 7,615 | Ground water | No current violation flagged |
| Tiffin Water SupplyIA5288021 | 7,577 | Ground water | No current violation flagged |
| Southeast Polk RwdIA7774701 | 7,565 | Surface water purchased | No current violation flagged |
| Creston Water SupplyIA8816089 | 7,536 | Surface water | No current violation flagged |
| Charles City Water SupplyIA3405012 | 7,446 | Ground water | No current violation flagged |
| Washington Water DepartmentIA9271068 | 7,362 | Ground water | No current violation flagged |
| Atlantic Municipal UtilitiesIA1509074 | 7,252 | Ground water | No current violation flagged |
| Hiawatha Water DeptIA5735045 | 7,183 | Ground water | No current violation flagged |
| Osceola Rural Water System-NorthIA7227701 | 7,002 | Ground water | No current violation flagged |
| Nevada Water SupplyIA8562044 | 6,925 | Ground water | No current violation flagged |
| Iowa Lakes Regional WaterIA2100701 | 6,755 | Ground water | No current violation flagged |
| Eldridge Water SupplyIA8230008 | 6,726 | Ground water | No current violation flagged |
| Polk City Water SupplyIA7770050 | 6,533 | Surface water purchased | No current violation flagged |
| Adel Municipal Water WorksIA2503003 | 6,461 | Ground water | No current violation flagged |
| Orange City Municipal Water DepartmentIA8474097 | 6,267 | Ground water | No current violation flagged |
| Spirit Lake WaterworksIA3070078 | 6,167 | Surface water | No current violation flagged |
| Maquoketa Municipal WaterIA4950029 | 6,128 | Ground water | Other current violation flag |
| Xenia Rwd (North)IA9425701 | 6,122 | Ground water | No current violation flagged |
| Independence Water DeptIA1037070 | 6,064 | Ground water | No current violation flagged |
| Asbury Municipal Water SystemIA3102001 | 5,943 | Ground water | No current violation flagged |
| Oelwein Municipal Water WorksIA3353088 | 5,920 | Ground water | No current violation flagged |
| Estherville Water Treatment PlantIA3218024 | 5,904 | Ground water | No current violation flagged |
| Marion Co. Rural Water DistrictIA6342711 | 5,687 | Ground water purchased | Other current violation flag |
| Red Oak Water SupplyIA6950075 | 5,596 | Ground water | No current violation flagged |
| De Witt Water SupplyIA2330036 | 5,514 | Ground water | No current violation flagged |
| Sheldon Water DepartmentIA7170040 | 5,512 | Ground water | No current violation flagged |
| Osceola Water WorksIA2038038 | 5,503 | Surface water | Other current violation flag |
| Algona Municipal UtilitiesIA5502015 | 5,487 | Ground water | No current violation flagged |
| Glenwood Municipal UtilitiesIA6525090 | 5,449 | Ground water | No current violation flagged |
| Winterset Municipal WaterworksIA6171029 | 5,428 | Surface water | No current violation flagged |
| Southern Sioux County Rural WaterIA8400733 | 5,420 | Ground water | No current violation flagged |
| Centerville Municipal WaterworksIA0407008 | 5,344 | Surface water purchased | No current violation flagged |
| Cherokee Water Supply - Plant 1IA1811020 | 5,199 | Ground water | No current violation flagged |
| Iowa Falls Water DepartmentIA4260097 | 5,146 | Ground water | No current violation flagged |
| Manchester Water SupplyIA2839021 | 5,077 | Ground water | No current violation flagged |
| Harlan Municipal UtilitiesIA8335029 | 5,067 | Ground water | No current violation flagged |
| Sergeant Bluff Water SupplyIA9774033 | 5,015 | Ground water | No current violation flagged |
| Xenia Rwd (Boone)IA0844006 | 4,975 | Purchased ground water under influence of surface water source | No current violation flagged |
| Vinton Municipal Water DeptIA0688053 | 4,938 | Ground water | No current violation flagged |
| Shenandoah Water DeptIA7383045 | 4,925 | Ground water | No current violation flagged |
| Humboldt Municipal Water DeptIA4641064 | 4,792 | Groundwater under influence of surface water | No current violation flagged |
| Sac & Fox (Meskwaki) In Iowa070000003 | 4,765 | Ground water | No current violation flagged |
| Camanche Water SupplyIA2322066 | 4,570 | Ground water | No current violation flagged |
| Evansdale Water WorksIA0723027 | 4,561 | Ground water | No current violation flagged |
| Mount Vernon Water SupplyIA5758021 | 4,527 | Ground water | No current violation flagged |
| Dyersville Municipal Water CoIA3130091 | 4,477 | Ground water | No current violation flagged |
| Anamosa Municipal Water SupplyIA5307048 | 4,457 | Ground water | No current violation flagged |
| Chariton Municipal Water WorksIA5903011 | 4,381 | Surface water purchased | No current violation flagged |
| Clarinda Water PlantIA7329029 | 4,372 | Surface water | No current violation flagged |
| Hampton Muni Water WorksIA3544024 | 4,337 | Ground water | No current violation flagged |
| Forest City Water SupplyIA9525047 | 4,285 | Ground water | No current violation flagged |
| Huxley Waterworks DeptIA8538066 | 4,244 | Ground water | No current violation flagged |
| Jefferson Water DepartmentIA3742004 | 4,182 | Ground water | No current violation flagged |
| Carlisle Water SupplyIA9113071 | 4,170 | Ground water | Other current violation flag |
| Regional WaterIA8300184 | 4,132 | Surface water purchased | No current violation flagged |
| Sirwa #3 (Osceola)IA2038701 | 4,080 | Surface water purchased | No current violation flagged |
| Rock Valley Water SupplyIA8482096 | 4,059 | Ground water | No current violation flagged |
| Monticello Water SupplyIA5343098 | 4,040 | Ground water | No current violation flagged |
| West Liberty Water UtilityIA7073010 | 3,938 | Ground water | No current violation flagged |
| Cresco WaterworksIA4515087 | 3,913 | Ground water | No current violation flagged |
| Waukon Water DepartmentIA0398082 | 3,827 | Ground water | No current violation flagged |
| Carter Lake Water DistrictIA7812079 | 3,791 | Surface water purchased | Other current violation flag |
| Emmetsburg Municipal Water DepartmentIA7428021 | 3,733 | Ground water | No current violation flagged |
| West Burlington Muni. Water SupplyIA2985002 | 3,728 | Surface water purchased | No current violation flagged |
| Albia Municipal Water WorksIA6803010 | 3,721 | Surface water purchased | No current violation flagged |
| Osage Municipal Water SupplyIA6663001 | 3,637 | Ground water | No current violation flagged |
| Eagle Grove Water SupplyIA9926096 | 3,601 | Ground water | No current violation flagged |
| West Central Rwa - Nish SystemIA1400902 | 3,573 | Ground water | No current violation flagged |
| Southwest Reg Water District (Red Oak)IA6950701 | 3,500 | Ground water | No current violation flagged |
| New Hampton Water SupplyIA1970051 | 3,494 | Ground water | No current violation flagged |
| Xenia Rwd (Woodward)IA2576705 | 3,465 | Surface water purchased | No current violation flagged |
| Milford Municipal UtilitiesIA3050079 | 3,431 | Surface water | No current violation flagged |
| Rural Water System #1IA8400722 | 3,428 | Groundwater under influence of surface water | No current violation flagged |
| Story City Water DeptIA8584000 | 3,357 | Ground water | No current violation flagged |
| Williamsburg Public Water SupplyIA4884023 | 3,345 | Ground water | No current violation flagged |
| Cherokee Rws - Cherokee SubsystemIA1811001 | 3,315 | Ground water | No current violation flagged |
| Tipton Water SupplyIA1689022 | 3,149 | Ground water | No current violation flagged |
| Tama Water SupplyIA8670013 | 3,130 | Ground water | No current violation flagged |
| Madrid Water DepartmentIA0848015 | 3,090 | Groundwater under influence of surface water | No current violation flagged |
| Garner Water WorksIA4130075 | 3,065 | Ground water | No current violation flagged |
| Solon Water DeptIA5282062 | 3,018 | Ground water | No current violation flagged |
| Southwest Reg Water District (Clarinda)IA7383901 | 2,942 | Surface water purchased | No current violation flagged |
| Wilton Water SupplyIA7078026 | 2,924 | Ground water | No current violation flagged |
| Onawa Municipal Water PlantIA6739095 | 2,906 | Ground water | No current violation flagged |
| Lake Panorama Water CompanyIA3900301 | 2,900 | Ground water | No current violation flagged |
| Sibley Public Water SupplyIA7245047 | 2,860 | Ground water purchased | No current violation flagged |
| Fairfax Water SupplyIA5731032 | 2,828 | Ground water | No current violation flagged |
| Clarion Water SupplyIA9909031 | 2,810 | Ground water | No current violation flagged |
| Grundy Center Water SupplyIA3833013 | 2,796 | Ground water purchased | No current violation flagged |
| Bloomfield Muni Water DeptIA2613019 | 2,792 | Surface water purchased | No current violation flagged |
| Hawarden Water SupplyIA8434040 | 2,700 | Ground water | No current violation flagged |
| Missouri Valley Water SupplyIA4344088 | 2,678 | Ground water | Current monitoring/reporting flag |
| Eldora Water SupplyIA4236005 | 2,664 | Ground water | No current violation flagged |
| Kalona Water DeptIA9233012 | 2,630 | Ground water | No current violation flagged |
| Rock Rapids Municipal Water WorksIA6065092 | 2,611 | Ground water | No current violation flagged |
| Sirwa - CorningIA0207704 | 2,585 | Surface water purchased | No current violation flagged |
| Center Point Water SupplyIA5718006 | 2,579 | Ground water | No current violation flagged |
| Hudson Water SupplyIA0737062 | 2,546 | Ground water purchased | No current violation flagged |
| West Union Water SupplyIA3383014 | 2,540 | Ground water | No current violation flagged |
| Mitchellville Water SupplyIA7751092 | 2,515 | Ground water | No current violation flagged |
| Postville Water DepartmentIA0375053 | 2,513 | Ground water | No current violation flagged |
| West Branch Water WorksIA1694000 | 2,509 | Ground water | No current violation flagged |
| Jesup Municipal Water SupplyIA1044006 | 2,508 | Ground water | No current violation flagged |
02 / CITY REPORTS
Iowa city water-system reports
Iowa has 49 city reports meeting the publication threshold for covered systems or reported population served.
Altoona2 systemsAmes2 systemsBurlington2 systemsCenterville2 systemsCherokee2 systemsClarinda2 systemsCreston2 systemsFort Madison2 systemsIndianola2 systemsIowa City2 systemsKnoxville2 systemsOsceola2 systemsOskaloosa2 systemsOttumwa2 systemsRed Oak2 systemsSpencer2 systemsWaverly2 systemsAnkeny1 systemsBoone1 systemsBrooklyn1 systemsCarroll1 systemsCedar Falls1 systemsCedar Rapids1 systemsClinton1 systemsClive1 systemsCoralville1 systemsCouncil Bluffs1 systemsDavenport1 systemsDes Moines1 systemsDubuque1 systemsFort Dodge1 systemsGrimes1 systemsJohnston1 systemsLe Mars1 systemsMarion1 systemsMarshalltown1 systemsMason City1 systemsMinburn1 systemsMuscatine1 systemsNewton1 systemsNorth Liberty1 systemsNorwalk1 systemsPella1 systemsSioux City1 systemsStorm Lake1 systemsUrbandale1 systemsWaterloo1 systemsWaukee1 systemsWest Des Moines1 systems
03 / COUNTY REPORTS
Iowa county water-system reports
Iowa has 66 county reports meeting the publication threshold for covered systems or reported population served.
Polk12 systemsDallas6 systemsJohnson6 systemsLinn6 systemsSioux6 systemsStory6 systemsBlack Hawk5 systemsBoone4 systemsWarren4 systemsClarke3 systemsClinton3 systemsDes Moines3 systemsDubuque3 systemsHardin3 systemsJefferson3 systemsLee3 systemsMadison3 systemsMarion3 systemsMuscatine3 systemsPage3 systemsPottawattamie3 systemsWashington3 systemsAdams2 systemsAllamakee2 systemsAppanoose2 systemsBremer2 systemsBuchanan2 systemsBuena Vista2 systemsCarroll2 systemsCedar2 systemsCerro Gordo2 systemsCherokee2 systemsClay2 systemsDavis2 systemsDecatur2 systemsDickinson2 systemsFayette2 systemsGreene2 systemsGrundy2 systemsHamilton2 systemsHenry2 systemsJasper2 systemsJones2 systemsLucas2 systemsMahaska2 systemsMarshall2 systemsMonroe2 systemsMontgomery2 systemsOsceola2 systemsPalo Alto2 systemsScott2 systemsShelby2 systemsTama2 systemsUnion2 systemsWapello2 systemsWebster2 systemsWoodbury2 systemsWright2 systemsAdair1 systemsButler1 systemsKeokuk1 systemsPlymouth1 systemsRinggold1 systemsTaylor1 systemsVan Buren1 systemsWayne1 systems