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CheckYourWater

PFAS Testing Results

Iowa

PFAS testing results for 152 water systems serving 2,438,376 residents.

Systems tested

152

21.1% had PFAS detections

Limits exceeded

7

4.6% of systems

Population affected

336K

served by systems over federal limits

Most common compound

11Cl-PF3OUdS

detected in 32 systems

Grade distribution

Every water system gets a letter grade based on how its worst detected PFAS compound compares to the federal Maximum Contaminant Level. Lower grades mean higher contamination.

A — 120 systems (78.9%)
B — 21 systems (13.8%)
C — 4 systems (2.6%)
D — 7 systems (4.6%)
F — 0 systems (0.0%)

How grades are calculated →

Communities exceeding federal limits

The water systems in Iowa where at least one PFAS compound exceeds the EPA Maximum Contaminant Level, sorted worst first.

System nameCityGradeWorst compoundTimes over limitPopulation
SIOUX CITY WATER SUPPLYSIOUX CITY
PFHxS3.0x86K
WAVERLY WATER DEPARTMENTWAVERLY
PFOA1.8x10K
MUSCATINE POWER & WATERMUSCATINE
PFOA1.8x26K
DUBUQUE WATER WORKSDUBUQUE
PFOA1.3x60K
WEST BURLINGTON MUNI. WATER SUPPLYWEST BURLINGTON
PFOA1.2x3.7K
OSAGE MUNICIPAL WATER SUPPLYOSAGE
PFOS1.1x3.6K
IOWA-AMERICAN WTR CO-DAVENPORTDAVENPORT
PFOA1.0x148K

Resources for taking action are available in our community toolkit.

What Iowa is doing about PFAS

As of April 2026, Iowa has not adopted state-level PFAS drinking water standards beyond the federal EPA limits finalized in April 2024. The Iowa Department of Natural Resources has conducted a voluntary PFAS sampling initiative at public water supplies, with results posted publicly. Detections at municipal supplies in central Iowa prompted expanded sampling during 2023 and 2024.

Public water systems in Iowa are subject to the federal compliance timeline requiring initial monitoring by 2027 and treatment installation by 2029.

Based on Iowa Department of Natural Resources publications.

All 152 tested water systems in Iowa

Sorted from lowest grade to highest. Click any system name for the full report. Filter by city or name with the search box below.

Showing 50 of 152 systems

GradeSystem nameCityWorst compoundvs. EPA limitPopulation
SIOUX CITY WATER SUPPLYSIOUX CITYPFHxS3.0× the federal limit86K
WAVERLY WATER DEPARTMENTWAVERLYPFOA1.8× the federal limit10K
MUSCATINE POWER & WATERMUSCATINEPFOA1.8× the federal limit26K
DUBUQUE WATER WORKSDUBUQUEPFOA1.3× the federal limit60K
WEST BURLINGTON MUNI. WATER SUPPLYWEST BURLINGTONPFOA1.2× the federal limit3.7K
OSAGE MUNICIPAL WATER SUPPLYOSAGEPFOS1.1× the federal limit3.6K
IOWA-AMERICAN WTR CO-DAVENPORTDAVENPORTPFOA1.0× the federal limit148K
WATERLOO WATER WORKSWATERLOOPFHxS74% of federal limit70K
IOWA-AMERICAN WTR CO-CLINTON DISTRICTCLINTONPFBABelow detection25K
BURLINGTON MUNICIPAL WATERWORKSBURLINGTONPFBABelow detection26K
URBAN BLUFFS - NORTHAVOCAPFPeABelow detection1.6K
BONDURANT MUNI WATER SUPPLYBONDURANTPFHxSBelow federal limit9.4K
HIAWATHA WATER DEPTHIAWATHAPFHxSBelow federal limit7.2K
CARLISLE WATER SUPPLYCARLISLEPFHxSBelow federal limit4.2K
RATHBUN REG WATER ASSN (FT MADISON)CENTERVILLEPFBABelow detection12K
RATHBUN REG WTR ASSN (BURLINGTON)CENTERVILLEPFBABelow detection8.4K
CENTERVILLE MUNICIPAL WATERWORKSCENTERVILLEPFBABelow detection5.3K
OSCEOLA WATER WORKSOSCEOLAPFBABelow detection5.5K
SIRWA #3 (OSCEOLA)CRESTONPFBABelow detection4.1K
GARDEN GROVE WATER SUPPLYALLERTONPFBABelow detection179
IOWA LAKES REGIONAL WATER - LAKES AREASPENCERPFBABelow detection8.5K
OKOBOJI WATER SUPPLYOKOBOJIPFBABelow detection768
SPIRIT LAKE WATERWORKSSPIRIT LAKEPFBABelow detection6.2K
KEOKUK MUNICIPAL WATER WORKSKEOKUKPFBABelow detection9.9K
CHARITON MUNICIPAL WATER WORKSCHARITONPFBABelow detection4.4K
ALBIA MUNICIPAL WATER WORKSALBIAPFBABelow detection3.7K
CLARINDA WATER PLANTCLARINDAPFBABelow detection4.4K
CARTER LAKE WATER DISTRICTCARTER LAKEPFBABelow detection3.8K
CAMBRIDGE WATER SUPPLYCAMBRIDGEPFBSBelow detection832
CRESTON WATER SUPPLYCRESTONPFBABelow detection7.5K
WAPELLO RURAL WATER ASSOC.OTTUMWAPFBABelow detection17K
DECORAH WATER DEPARTMENTDECORAHPFBSBelow detection7.6K
WAUKON WATER DEPARTMENTWAUKON-Below detection3.8K
RATHBUN REGIONAL WATER ASSN (RATHBUN)CENTERVILLE-Below detection33K
BELLE PLAINE WATER DEPTBELLE PLAINE-Below detection2.4K
VINTON MUNICIPAL WATER DEPTVINTON-Below detection4.9K
CEDAR FALLS MUNICIPAL WATER UTILITIESCEDAR FALLS-Below detection41K
EVANSDALE WATER WORKSEVANSDALE-Below detection4.6K
BOONE WATER WORKSBOONE-Below detection13K
XENIA RWD (BOONE)BOUTON-Below detection5.0K
IA REGIONAL UTILITIES ASSOC (WAVERLY)NEWTON-Below detection38K
INDEPENDENCE WATER DEPTINDEPENDENCE-Below detection6.1K
STORM LAKE WATER TREATMENT PLANTSTORM LAKE-Below detection11K
CLARKSVILLE WATER SUPPLYMARSHALLTOWN-Below detection1.3K
WEST CENTRAL RWA - NISH SYSTEMMANNING-Below detection3.6K
WEST CENTRAL RWA-BOYER SYSTEMMANNING-Below detection1.7K
CARROLL MUNICIPAL WATER SUPPLYCARROLL-Below detection10K
ANITA MUNICIPAL UTILITIESANITA-Below detection972
ATLANTIC MUNICIPAL UTILITIESATLANTIC-Below detection7.3K
CLEAR LAKE WATER DEPARTMENTCLEAR LAKE-Below detection7.7K

Check your water system

Enter your zip code to see the PFAS results for the water system that serves your home.

Where this data comes from

  • EPA Unregulated Contaminant Monitoring Rule, 5th cycle (UCMR 5)
  • Testing period: 2023 to 2026
  • Federal limits: EPA Maximum Contaminant Levels finalized April 2024
  • Read the full methodology