Systems with a yearly average above an EPA comparison level
0.7%1 of 146 active community water systems
All 146 systems met the sampling requirement for a yearly average. Of those systems, 1 had at least one yearly average above an EPA comparison level and 145 did not.
EPA-based study benchmark: a fixed, unrounded research cutoff used to reproduce EPA’s final UCMR 5 technical-assistance classification based on the April 2024 federal levels. It is not a current federal or state standard. The label does not determine compliance, household exposure, or health risk.
State rules: The labels on this page use fixed research cutoffs based on the April 2024 federal levels. Iowa may use different current standards or guidance. These UCMR 5 results do not determine current federal or state compliance. Find the official Iowa drinking-water program →
Check your area
Find your water system
A ZIP code finds possible public water systems for an area; it cannot identify the supplier for a specific home. Confirm the provider using a water bill or utility record.
Compound summary
System counts in Iowa
Each count shows how many included water systems had a yearly average above the named EPA comparison level.
| EPA rounding cutoff | Systems above comparison level | Water systems included | Percent |
|---|---|---|---|
| PFOA: 4 ppt level; unrounded average ≥4.05 ppt after applying EPA rounding | 0 | 146 | 0.0% |
| PFOS: 4 ppt level; unrounded average ≥4.05 ppt after applying EPA rounding | 0 | 146 | 0.0% |
| PFHxS: 10 ppt level; unrounded average ≥15 ppt after applying EPA rounding | 1 | 146 | 0.7% |
| PFNA: 10 ppt level; unrounded average ≥15 ppt after applying EPA rounding | 0 | 146 | 0.0% |
| HFPO-DA: 10 ppt level; unrounded average ≥15 ppt after applying EPA rounding | 0 | 146 | 0.0% |
| Hazard Index: 1 level; unrounded index ≥1.5 and at least two detected components | 1 | 146 | 0.7% |
System directory
Community water systems with complete monitoring
“Complete monitoring” means at least one sampling location had every required sample needed to calculate a yearly average. It does not mean every location or home was tested. Each PWSID appears once, preventing double counting across ZIP associations.
| Public water system | PWSID | Population served | Primary source | Sampling locations | EPA comparison result |
|---|---|---|---|---|---|
| ADEL MUNICIPAL WATER WORKS | IA2503003 | 6,461 | Ground water | 1 | No available average above comparison levels |
| ALBIA MUNICIPAL WATER WORKS | IA6803010 | 3,721 | Surface water purchased | 1 | No available average above comparison levels |
| ALGONA MUNICIPAL UTILITIES | IA5502015 | 5,487 | Ground water | 1 | No available average above comparison levels |
| ALTOONA WATER SUPPLY | IA7707030 | 19,565 | Ground water | 3 | No available average above comparison levels |
| AMES WATER TREATMENT PLANT | IA8503039 | 55,177 | Ground water | 1 | No available average above comparison levels |
| ANAMOSA MUNICIPAL WATER SUPPLY | IA5307048 | 4,457 | Ground water | 1 | No available average above comparison levels |
| ANITA MUNICIPAL UTILITIES | IA1503053 | 972 | Ground water | 1 | No available average above comparison levels |
| ANKENY, CITY OF | IA7709053 | 76,207 | Surface water purchased | 2 | No available average above comparison levels |
| ASBURY MUNICIPAL WATER SYSTEM | IA3102001 | 5,943 | Ground water | 4 | No available average above comparison levels |
| ATLANTIC MUNICIPAL UTILITIES | IA1509074 | 7,252 | Ground water | 1 | No available average above comparison levels |
| BANCROFT WATER SUPPLY | IA5507085 | 711 | Ground water | 1 | No available average above comparison levels |
| BELLE PLAINE WATER DEPT | IA0610099 | 2,380 | Ground water | 1 | No available average above comparison levels |
| BONDURANT MUNI WATER SUPPLY | IA7717032 | 9,393 | Surface water purchased | 1 | No available average above comparison levels |
| BOONE WATER WORKS | IA0819033 | 12,704 | Groundwater under influence of surface water | 1 | No available average above comparison levels |
| BURLINGTON MUNICIPAL WATERWORKS | IA2909053 | 26,015 | Surface water | 1 | No available average above comparison levels |
| CAMANCHE WATER SUPPLY | IA2322066 | 4,570 | Ground water | 1 | No available average above comparison levels |
| CAMBRIDGE WATER SUPPLY | IA8509069 | 832 | Ground water | 1 | No available average above comparison levels |
| CARLISLE WATER SUPPLY | IA9113071 | 4,170 | Ground water | 1 | No available average above comparison levels |
| CARROLL MUNICIPAL WATER SUPPLY | IA1415072 | 10,184 | Ground water | 1 | No available average above comparison levels |
| CARTER LAKE WATER DISTRICT | IA7812079 | 3,791 | Surface water purchased | 2 | No available average above comparison levels |
| CEDAR FALLS MUNICIPAL WATER UTILITIES | IA0709084 | 40,713 | Ground water | 8 | No available average above comparison levels |
| CEDAR RAPIDS WATER DEPARTMENT | IA5715093 | 142,364 | Groundwater under influence of surface water | 2 | No available average above comparison levels |
| CHARITON MUNICIPAL WATER WORKS | IA5903011 | 4,381 | Surface water purchased | 1 | No available average above comparison levels |
| CHARLES CITY WATER SUPPLY | IA3405012 | 7,446 | Ground water | 1 | No available average above comparison levels |
| CHEROKEE WATER SUPPLY - PLANT 1 | IA1811020 | 5,199 | Ground water | 1 | No available average above comparison levels |
| CLARINDA WATER PLANT | IA7329029 | 4,372 | Surface water | 1 | No available average above comparison levels |
| CLARKSVILLE WATER SUPPLY | IA1228038 | 1,254 | Ground water | 1 | No available average above comparison levels |
| CLEAR LAKE WATER DEPARTMENT | IA1716076 | 7,687 | Ground water | 1 | No available average above comparison levels |
| CLERMONT WATER SUPPLY | IA3317047 | 586 | Ground water | 1 | No available average above comparison levels |
| CLIVE WATER DEPARTMENT | IA7720051 | 20,277 | Surface water purchased | 1 | No available average above comparison levels |
| CORALVILLE MUNI WATER SYSTEM | IA5208071 | 22,318 | Ground water | 1 | No available average above comparison levels |
| COUNCIL BLUFFS WATER WORKS | IA7820080 | 64,447 | Surface water | 2 | No available average above comparison levels |
| CRESCO WATERWORKS | IA4515087 | 3,913 | Ground water | 2 | No available average above comparison levels |
| CRESTON WATER SUPPLY | IA8816089 | 7,536 | Surface water | 1 | No available average above comparison levels |
| DE WITT WATER SUPPLY | IA2330036 | 5,514 | Ground water | 3 | No available average above comparison levels |
| DECORAH WATER DEPARTMENT | IA9630012 | 7,615 | Ground water | 6 | No available average above comparison levels |
| DENISON WATER SUPPLY | IA2424027 | 9,381 | Ground water | 1 | No available average above comparison levels |
| DES MOINES WATER WORKS | IA7727031 | 246,055 | Surface water purchased | 3 | No available average above comparison levels |
| DUBUQUE WATER WORKS | IA3126052 | 59,667 | Ground water | 1 | No available average above comparison levels |
| DYERSVILLE MUNICIPAL WATER CO | IA3130091 | 4,477 | Ground water | 2 | No available average above comparison levels |
| EAGLE GROVE WATER SUPPLY | IA9926096 | 3,601 | Ground water | 2 | No available average above comparison levels |
| ELDRIDGE WATER SUPPLY | IA8230008 | 6,726 | Ground water | 1 | No available average above comparison levels |
| EMMETSBURG MUNICIPAL WATER DEPARTMENT | IA7428021 | 3,733 | Ground water | 1 | No available average above comparison levels |
| ESTHERVILLE WATER TREATMENT PLANT | IA3218024 | 5,904 | Ground water | 1 | No available average above comparison levels |
| EVANSDALE WATER WORKS | IA0723027 | 4,561 | Ground water | 2 | No available average above comparison levels |
| FAIRFIELD WATER SUPPLY | IA5131033 | 9,821 | Ground water | 1 | No available average above comparison levels |
| FOREST CITY WATER SUPPLY | IA9525047 | 4,285 | Ground water | 1 | No available average above comparison levels |
| FORT DODGE WATER SUPPLY | IA9433050 | 25,874 | Ground water | 1 | No available average above comparison levels |
| FT MADISON MUNI WATER WORKS | IA5625062 | 11,087 | Ground water | 1 | No available average above comparison levels |
| GARDEN GROVE WATER SUPPLY | IA2725073 | 179 | Surface water purchased | 1 | No available average above comparison levels |
| GLENWOOD MUNICIPAL UTILITIES | IA6525090 | 5,449 | Ground water | 1 | No available average above comparison levels |
| GRIMES WATER SUPPLY | IA7736011 | 17,809 | Ground water | 1 | No available average above comparison levels |
| GRINNELL WATER DEPARTMENT | IA7930008 | 9,564 | Ground water | 1 | No available average above comparison levels |
| HAMPTON MUNI WATER WORKS | IA3544024 | 4,337 | Ground water | 1 | No available average above comparison levels |
| HARLAN MUNICIPAL UTILITIES | IA8335029 | 5,067 | Ground water | 1 | No available average above comparison levels |
| HIAWATHA WATER DEPT | IA5735045 | 7,183 | Ground water | 5 | No available average above comparison levels |
| HUMBOLDT MUNICIPAL WATER DEPT | IA4641064 | 4,792 | Groundwater under influence of surface water | 1 | No available average above comparison levels |
| HUXLEY WATERWORKS DEPT | IA8538066 | 4,244 | Ground water | 1 | No available average above comparison levels |
| IA REGIONAL UTILITIES ASSOC (WAVERLY) | IA0990701 | 37,820 | Ground water | 3 | No available average above comparison levels |
| INDEPENDENCE WATER DEPT | IA1037070 | 6,064 | Ground water | 4 | No available average above comparison levels |
| INDIANOLA WATER SUPPLY | IA9133075 | 15,833 | Ground water | 1 | No available average above comparison levels |
| IOWA CITY MHP LLC | IA5200601 | 280 | Ground water | 1 | No available average above comparison levels |
| IOWA FALLS WATER DEPARTMENT | IA4260097 | 5,146 | Ground water | 2 | No available average above comparison levels |
| IOWA LAKES REGIONAL WATER | IA2100701 | 6,755 | Ground water | 1 | No available average above comparison levels |
| IOWA LAKES REGIONAL WATER - LAKES AREA | IA3060001 | 9,021 | Surface water purchased | 3 | No available average above comparison levels |
| IOWA-AMERICAN WTR CO-CLINTON DISTRICT | IA2326048 | 24,769 | Ground water | 4 | No available average above comparison levels |
| ISU | IA8503528 | 42,000 | Ground water purchased | 1 | No available average above comparison levels |
| JEFFERSON WATER DEPARTMENT | IA3742004 | 4,182 | Ground water | 1 | No available average above comparison levels |
| JOHNSTON MUNICIPAL WATER SUPPLY | IA7740011 | 24,897 | Surface water purchased | 2 | No available average above comparison levels |
| KEOKUK MUNICIPAL WATER WORKS | IA5640019 | 9,900 | Surface water | 1 | No available average above comparison levels |
| KNOXVILLE WATER WORKS | IA6342036 | 8,400 | Ground water | 1 | No available average above comparison levels |
| LEMARS WATER DEPARTMENT | IA7540174 | 10,606 | Ground water | 1 | No available average above comparison levels |
| LYON-SIOUX RWS-BIG SIOUX | IA6000755 | 1,530 | Ground water | 3 | No available average above comparison levels |
| MAHASKA RURAL WATER SYSTEM, INC. | IA6273901 | 9,818 | Ground water | 1 | No available average above comparison levels |
| MANCHESTER WATER SUPPLY | IA2839021 | 5,077 | Ground water | 5 | No available average above comparison levels |
| MAQUOKETA MUNICIPAL WATER | IA4950029 | 6,128 | Ground water | 1 | No available average above comparison levels |
| MARION CO. RURAL WATER DISTRICT | IA6342711 | 5,687 | Ground water purchased | 2 | No available average above comparison levels |
| MARION MUNICIPAL WATER DEPT | IA5751035 | 41,623 | Ground water | 4 | No available average above comparison levels |
| MARSHALLTOWN WATER WORKS | IA6469042 | 27,680 | Ground water | 1 | No available average above comparison levels |
| MASON CITY WATER DEPARTMENT | IA1750048 | 27,338 | Ground water | 1 | No available average above comparison levels |
| MELCHER-DALLAS WATER SUPPLY | IA6300099 | 1,213 | Ground water | 1 | No available average above comparison levels |
| MONTICELLO WATER SUPPLY | IA5343098 | 4,040 | Ground water | 3 | No available average above comparison levels |
| MOUNT PLEASANT MUNICIPAL UTILITIES | IA4453016 | 9,274 | Ground water | 2 | No available average above comparison levels |
| MOUNT VERNON WATER SUPPLY | IA5758021 | 4,527 | Ground water | 2 | No available average above comparison levels |
| MUSCATINE POWER & WATER | IA7048001 | 25,516 | Ground water | 4 | No available average above comparison levels |
| NEVADA WATER SUPPLY | IA8562044 | 6,925 | Ground water | 1 | No available average above comparison levels |
| NEW HAMPTON WATER SUPPLY | IA1970051 | 3,494 | Ground water | 2 | No available average above comparison levels |
| NEWTON WATER SUPPLY | IA5059064 | 16,518 | Ground water | 1 | No available average above comparison levels |
| NORTH LIBERTY WATER SUPPLY | IA5252072 | 23,276 | Ground water | 1 | No available average above comparison levels |
| NORWALK WATER SUPPLY | IA9164078 | 14,334 | Surface water purchased | 1 | No available average above comparison levels |
| OELWEIN MUNICIPAL WATER WORKS | IA3353088 | 5,920 | Ground water | 3 | No available average above comparison levels |
| OKOBOJI WATER SUPPLY | IA3060091 | 776 | Surface water purchased | 1 | No available average above comparison levels |
| ONAWA MUNICIPAL WATER PLANT | IA6739095 | 2,906 | Ground water | 1 | No available average above comparison levels |
| ORANGE CITY MUNICIPAL WATER DEPARTMENT | IA8474097 | 6,267 | Ground water | 1 | No available average above comparison levels |
| OSAGE MUNICIPAL WATER SUPPLY | IA6663001 | 3,637 | Ground water | 4 | No available average above comparison levels |
| OSCEOLA RURAL WATER SYSTEM-NORTH | IA7227701 | 7,002 | Ground water | 1 | No available average above comparison levels |
| OSCEOLA WATER WORKS | IA2038038 | 5,503 | Surface water | 1 | No available average above comparison levels |
| OSKALOOSA MUNICIPAL WATER DEPT | IA6273005 | 12,808 | Groundwater under influence of surface water | 1 | No available average above comparison levels |
| PELLA WATER WORKS DEPARTMENT | IA6368033 | 11,052 | Ground water | 1 | No available average above comparison levels |
| PERRY MUNICIPAL WATER WORKS | IA2561036 | 7,836 | Ground water | 1 | No available average above comparison levels |
| POLK CITY WATER SUPPLY | IA7770050 | 6,533 | Surface water purchased | 1 | No available average above comparison levels |
| PORTSMOUTH WATER SUPPLY | IA8365052 | 189 | Surface water purchased | 1 | No available average above comparison levels |
| POWESHIEK WATER ASSOCIATION | IA8670701 | 13,920 | Ground water | 1 | No available average above comparison levels |
| RATHBUN REG WATER ASSN (FT MADISON) | IA0400901 | 11,840 | Surface water purchased | 2 | No available average above comparison levels |
| RATHBUN REG WTR ASSN (BURLINGTON) | IA0400902 | 8,375 | Surface water purchased | 1 | No available average above comparison levels |
| RED OAK WATER SUPPLY | IA6950075 | 5,596 | Ground water | 3 | No available average above comparison levels |
| REGIONAL WATER | IA8300184 | 4,132 | Surface water purchased | 1 | No available average above comparison levels |
| RIVERVIEW SUBDIVISION | IA7038301 | 37 | Ground water | 1 | No available average above comparison levels |
| ROCK VALLEY WATER SUPPLY | IA8482096 | 4,059 | Ground water | 1 | No available average above comparison levels |
| RURAL WATER SYSTEM #1 | IA8400722 | 3,428 | Groundwater under influence of surface water | 3 | No available average above comparison levels |
| SAC & FOX (MESKWAKI) IN IOWA | 070000003 | 4,765 | Ground water | 1 | No available average above comparison levels |
| SERGEANT BLUFF WATER SUPPLY | IA9774033 | 5,015 | Ground water | 1 | No available average above comparison levels |
| SHELDON WATER DEPARTMENT | IA7170040 | 5,512 | Ground water | 1 | No available average above comparison levels |
| SHENANDOAH WATER DEPT | IA7383045 | 4,925 | Ground water | 1 | No available average above comparison levels |
| SIOUX CENTER MUNICIPAL WATER DEPARTMENT | IA8486053 | 8,231 | Ground water | 2 | No available average above comparison levels |
| SIOUX CITY WATER SUPPLY | IA9778054 | 85,791 | Groundwater under influence of surface water | 2 | Above an EPA comparison level |
| SIRWA #2 (CRESTON) | IA8080701 | 20,793 | Surface water | 1 | No available average above comparison levels |
| SIRWA #3 (OSCEOLA) | IA2038701 | 4,080 | Surface water purchased | 1 | No available average above comparison levels |
| SOUTHEAST POLK RWD | IA7774701 | 7,565 | Surface water purchased | 1 | No available average above comparison levels |
| SOUTHERN SIOUX COUNTY RURAL WATER | IA8400733 | 5,420 | Ground water | 1 | No available average above comparison levels |
| SPENCER MUNICIPAL WATER UTILITY | IA2171071 | 11,325 | Ground water | 1 | No available average above comparison levels |
| SPIRIT LAKE WATERWORKS | IA3070078 | 6,167 | Surface water | 1 | No available average above comparison levels |
| STORM LAKE WATER TREATMENT PLANT | IA1178097 | 11,431 | Ground water | 1 | No available average above comparison levels |
| STORY CITY WATER DEPT | IA8584000 | 3,357 | Ground water | 1 | No available average above comparison levels |
| UNIVERSITY WATER SYSTEM | IA5225101 | 26,684 | Surface water | 1 | No available average above comparison levels |
| URBAN BLUFFS - NORTH | IA7820701 | 1,558 | Surface water purchased | 1 | No available average above comparison levels |
| URBANDALE WATER UTILITY | IA7780042 | 45,605 | Surface water purchased | 1 | No available average above comparison levels |
| VINTON MUNICIPAL WATER DEPT | IA0688053 | 4,938 | Ground water | 1 | No available average above comparison levels |
| WAPELLO RURAL WATER ASSOC. | IA9000742 | 17,263 | Surface water purchased | 3 | No available average above comparison levels |
| WARREN WATER DISTRICT | IA9133701 | 20,095 | Surface water purchased | 1 | No available average above comparison levels |
| WASHINGTON WATER DEPARTMENT | IA9271068 | 7,362 | Ground water | 1 | No available average above comparison levels |
| WATERLOO WATER WORKS | IA0790074 | 69,504 | Ground water | 9 | No available average above comparison levels |
| WAUKEE WATER SUPPLY | IA2573080 | 31,823 | Surface water purchased | 1 | No available average above comparison levels |
| WAUKON WATER DEPARTMENT | IA0398082 | 3,827 | Ground water | 2 | No available average above comparison levels |
| WAVERLY WATER DEPARTMENT | IA0990085 | 10,394 | Ground water | 4 | No available average above comparison levels |
| WEBSTER CITY WATER SUPPLY | IA4063094 | 7,825 | Ground water | 3 | No available average above comparison levels |
| WEST BURLINGTON MUNI. WATER SUPPLY | IA2985002 | 3,728 | Surface water purchased | 1 | No available average above comparison levels |
| WEST CENTRAL RWA - NISH SYSTEM | IA1400902 | 3,573 | Ground water | 2 | No available average above comparison levels |
| WEST CENTRAL RWA-BOYER SYSTEM | IA1400903 | 1,715 | Ground water | 1 | No available average above comparison levels |
| WEST DES MOINES WATER WORKS | IA7785007 | 73,959 | Surface water purchased | 2 | No available average above comparison levels |
| WEST LIBERTY WATER UTILITY | IA7073010 | 3,938 | Ground water | 1 | No available average above comparison levels |
| WINTERSET MUNICIPAL WATERWORKS | IA6171029 | 5,428 | Surface water | 1 | No available average above comparison levels |
| XENIA RWD (BOONE) | IA0844006 | 4,975 | Purchased ground water under influence of surface water source | 1 | No available average above comparison levels |
| XENIA RWD (DES MOINES) | IA2573701 | 12,860 | Surface water purchased | 1 | No available average above comparison levels |
| XENIA RWD (NORTH) | IA9425701 | 6,122 | Ground water | 1 | No available average above comparison levels |
| XENIA RWD (WOODWARD) | IA2576705 | 3,465 | Surface water purchased | 2 | No available average above comparison levels |
How the count works
What is included
Each active community water system with enough required samples for a yearly average is counted once, even if it is linked with several ZIP codes. Private wells are excluded, and UCMR 5 did not comprehensively monitor every small system.