Iowa water providers
Find published drinking-water records, providers, and official agency resources for Iowa. Review sources, sample dates, and coverage.
Official drinking-water resources
The responsible agency may differ for tribal systems. Record availability and sample dates vary by provider.
Community systems appear first. Sort: Population served · A–Z
Public water systems
1,803 systems in the imported directory. Includes community systems, schools, workplaces, and other public systems.
- Des Moines Water WorksIA7727031 · CWS · Population served: 246,055
- Iowa-American Wtr Co-DavenportIA8222001 · CWS · Population served: 147,720
- Cedar Rapids Water DepartmentIA5715093 · CWS · Population served: 142,364
- Sioux City Water SupplyIA9778054 · CWS · Population served: 85,791
- City of AnkenyIA7709053 · CWS · Population served: 76,207
- West Des Moines Water WorksIA7785007 · CWS · Population served: 73,959
- Waterloo Water WorksIA0790074 · CWS · Population served: 69,504
- Iowa City Water DepartmentIA5225079 · CWS · Population served: 68,753
- Council Bluffs Water WorksIA7820080 · CWS · Population served: 64,447
- Dubuque Water WorksIA3126052 · CWS · Population served: 59,667
- Ames Water Treatment PlantIA8503039 · CWS · Population served: 55,177
- Urbandale Water UtilityIA7780042 · CWS · Population served: 45,605
- IsuIA8503528 · CWS · Population served: 42,000
- Marion Municipal Water DeptIA5751035 · CWS · Population served: 41,623
- Cedar Falls Municipal Water UtilitiesIA0709084 · CWS · Population served: 40,713
- Ia Regional Utilities Assoc (WAVERLY)IA0990701 · CWS · Population served: 37,820
- Rathbun Regional Water Assn (RATHBUN)IA0400900 · CWS · Population served: 33,000
- Waukee Water SupplyIA2573080 · CWS · Population served: 31,823
- Marshalltown Water WorksIA6469042 · CWS · Population served: 27,680
- Mason City Water DepartmentIA1750048 · CWS · Population served: 27,338
- University Water SystemIA5225101 · CWS · Population served: 26,684
- Burlington Municipal WaterworksIA2909053 · CWS · Population served: 26,015
- Fort Dodge Water SupplyIA9433050 · CWS · Population served: 25,874
- Ottumwa Water WorksIA9083012 · CWS · Population served: 25,529
- Muscatine Power & WaterIA7048001 · CWS · Population served: 25,516
- Johnston Municipal Water SupplyIA7740011 · CWS · Population served: 24,897
- Iowa-American Wtr Co-Clinton DistrictIA2326048 · CWS · Population served: 24,769
- North Liberty Water SupplyIA5252072 · CWS · Population served: 23,276
- Coralville Muni Water SystemIA5208071 · CWS · Population served: 22,318
- Sirwa #2 (CRESTON)IA8080701 · CWS · Population served: 20,793
- Clive Water DepartmentIA7720051 · CWS · Population served: 20,277
- Warren Water DistrictIA9133701 · CWS · Population served: 20,095
- Altoona Water SupplyIA7707030 · CWS · Population served: 19,565
- Grimes Water SupplyIA7736011 · CWS · Population served: 17,809
- Wapello Rural Water Assoc.IA9000742 · CWS · Population served: 17,263
- Newton Water SupplyIA5059064 · CWS · Population served: 16,518
- Indianola Water SupplyIA9133075 · CWS · Population served: 15,833
- Norwalk Water SupplyIA9164078 · CWS · Population served: 14,334
- Poweshiek Water AssociationIA8670701 · CWS · Population served: 13,920
- Xenia RWD (DES MOINES)IA2573701 · CWS · Population served: 12,860
- Oskaloosa Municipal Water DeptIA6273005 · CWS · Population served: 12,808
- Boone Water WorksIA0819033 · CWS · Population served: 12,704
- Rathbun Reg Water Assn (FT MADISON)IA0400901 · CWS · Population served: 11,840
- Storm Lake Water Treatment PlantIA1178097 · CWS · Population served: 11,431
- Spencer Municipal Water UtilityIA2171071 · CWS · Population served: 11,325
- Ft Madison Muni Water WorksIA5625062 · CWS · Population served: 11,087
- Pella Water Works DepartmentIA6368033 · CWS · Population served: 11,052
- Lemars Water DepartmentIA7540174 · CWS · Population served: 10,606
- Waverly Water DepartmentIA0990085 · CWS · Population served: 10,394
- Carroll Municipal Water SupplyIA1415072 · CWS · Population served: 10,184
- Keokuk Municipal Water WorksIA5640019 · CWS · Population served: 9,900
- Fairfield Water SupplyIA5131033 · CWS · Population served: 9,821
- Mahaska Rural Water System, Inc.IA6273901 · CWS · Population served: 9,818
- Grinnell Water DepartmentIA7930008 · CWS · Population served: 9,564
- Bondurant Muni Water SupplyIA7717032 · CWS · Population served: 9,393
- Denison Water SupplyIA2424027 · CWS · Population served: 9,381
- Mount Pleasant Municipal UtilitiesIA4453016 · CWS · Population served: 9,274
- Iowa Lakes Regional Water - OsgoodIA3060001 · CWS · Population served: 9,021
- Knoxville Water WorksIA6342036 · CWS · Population served: 8,400
- Rathbun Reg Wtr Assn (BURLINGTON)IA0400902 · CWS · Population served: 8,375
- Sioux Center Municipal Water DepartmentIA8486053 · CWS · Population served: 8,231
- Perry Municipal Water WorksIA2561036 · CWS · Population served: 7,836
- Webster City Water SupplyIA4063094 · CWS · Population served: 7,825
- Clear Lake Water DepartmentIA1716076 · CWS · Population served: 7,687
- Decorah Water DepartmentIA9630012 · CWS · Population served: 7,615
- Tiffin Water SupplyIA5288021 · CWS · Population served: 7,577
- Southeast Polk RWDIA7774701 · CWS · Population served: 7,565
- Creston Water SupplyIA8816089 · CWS · Population served: 7,536
- Charles City Water SupplyIA3405012 · CWS · Population served: 7,446
- Washington Water DepartmentIA9271068 · CWS · Population served: 7,362
- Atlantic Municipal UtilitiesIA1509074 · CWS · Population served: 7,252
- Hiawatha Water DeptIA5735045 · CWS · Population served: 7,183
- Osceola Rural Water System-NorthIA7227701 · CWS · Population served: 7,002
- Nevada Water SupplyIA8562044 · CWS · Population served: 6,925
- Iowa Lakes Regional WaterIA2100701 · CWS · Population served: 6,755
- Eldridge Water SupplyIA8230008 · CWS · Population served: 6,726
- Polk City Water SupplyIA7770050 · CWS · Population served: 6,533
- Adel Municipal Water WorksIA2503003 · CWS · Population served: 6,461
- Orange City Municipal Water DepartmentIA8474097 · CWS · Population served: 6,267
- Spirit Lake WaterworksIA3070078 · CWS · Population served: 6,167
- Maquoketa Municipal WaterIA4950029 · CWS · Population served: 6,128
- Xenia RWD (NORTH)IA9425701 · CWS · Population served: 6,122
- Independence Water DeptIA1037070 · CWS · Population served: 6,064
- Asbury Municipal Water SystemIA3102001 · CWS · Population served: 5,943
- Oelwein Municipal Water WorksIA3353088 · CWS · Population served: 5,920
- Estherville Water Treatment PlantIA3218024 · CWS · Population served: 5,904
- Marion Co. Rural Water DistrictIA6342711 · CWS · Population served: 5,687
- Red Oak Water SupplyIA6950075 · CWS · Population served: 5,596
- De Witt Water SupplyIA2330036 · CWS · Population served: 5,514
- Sheldon Water DepartmentIA7170040 · CWS · Population served: 5,512
- Osceola Water WorksIA2038038 · CWS · Population served: 5,503
- Algona Municipal UtilitiesIA5502015 · CWS · Population served: 5,487
- Glenwood Municipal UtilitiesIA6525090 · CWS · Population served: 5,449
- Winterset Municipal WaterworksIA6171029 · CWS · Population served: 5,428
- Southern Sioux County Rural WaterIA8400733 · CWS · Population served: 5,420
- Centerville Municipal WaterworksIA0407008 · CWS · Population served: 5,344
- Cherokee Water Supply - Plant 1IA1811020 · CWS · Population served: 5,199
- Iowa Falls Water DepartmentIA4260097 · CWS · Population served: 5,146
- Manchester Water SupplyIA2839021 · CWS · Population served: 5,077
- Harlan Municipal UtilitiesIA8335029 · CWS · Population served: 5,067