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CheckYourWater

PFAS Testing Results

Illinois

PFAS testing results for 487 water systems serving 11,121,493 residents.

Systems tested

487

25.3% had PFAS detections

Limits exceeded

25

5.1% of systems

Population affected

488K

served by systems over federal limits

Most common compound

PFOS

detected in 35 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 — 364 systems (74.7%)
B — 68 systems (14.0%)
C — 30 systems (6.2%)
D — 25 systems (5.1%)
F — 0 systems (0.0%)

How grades are calculated →

Communities exceeding federal limits

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

System nameCityGradeWorst compoundTimes over limitPopulation
COLLINSVILLE, ILCOLLINSVILLE
PFOA4.5x30K
EAST ALTONEAST ALTON
PFOA3.1x5.8K
GALESBURGGALESBURG
PFOA2.8x32K
FREEPORTFREEPORT
PFOS2.7x24K
NEW BADENNEW BADEN
PFOS2.4x4.2K
ABINGDONMONMOUTH
PFOA2.3x3.3K
CREST HILLCREST HILL
PFOA2.2x21K
Prairie Path Water Co. - Whispering HillsMCHENRY
PFOA2.1x8.3K
IL AMERICAN-VALLEY VIEWGODFREY
PFOA1.8x6.7K
FREEBURGFREEBURG
PFOS1.7x4.7K

Resources for taking action are available in our community toolkit.

What Illinois is doing about PFAS

Illinois has adopted health advisory guidance levels for six PFAS compounds through the Illinois Environmental Protection Agency, including a PFOA guidance level of 2 parts per trillion and a PFOS guidance level of 14 parts per trillion, both advisory rather than enforceable. The state has conducted a statewide PFAS sampling investigation of community water supplies under an EPA grant.

The Illinois legislature passed the PFAS Reduction Act in 2021, prohibiting the sale and use of Class B firefighting foam containing intentionally added PFAS. State records show Illinois has joined multistate litigation against 3M and DuPont, and several utilities near former industrial and military sites have reported exceedances.

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

Based on Illinois Environmental Protection Agency publications and Illinois legislative records.

All 487 tested water systems in Illinois

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 487 systems

GradeSystem nameCityWorst compoundvs. EPA limitPopulation
COLLINSVILLE, ILCOLLINSVILLEPFOA4.5× the federal limit30K
EAST ALTONEAST ALTONPFOA3.1× the federal limit5.8K
GALESBURGGALESBURGPFOA2.8× the federal limit32K
FREEPORTFREEPORTPFOS2.7× the federal limit24K
NEW BADENNEW BADENPFOS2.4× the federal limit4.2K
ABINGDONMONMOUTHPFOA2.3× the federal limit3.3K
CREST HILLCREST HILLPFOA2.2× the federal limit21K
Prairie Path Water Co. - Whispering HillsMCHENRYPFOA2.1× the federal limit8.3K
IL AMERICAN-VALLEY VIEWGODFREYPFOA1.8× the federal limit6.7K
FREEBURGFREEBURGPFOS1.7× the federal limit4.7K
CHANNAHONCHANNAHONPFOS1.4× the federal limit13K
DIXMOORDIXMOORPFOS1.4× the federal limit3.0K
IL American - LincolnGODFREYPFOA1.4× the federal limit15K
IL AMERICAN-PEORIAGODFREYPFOS1.4× the federal limit138K
SOUTH ELGINSOUTH ELGINPFOA1.4× the federal limit24K
NORTH PARK PWDMACHESNEY PARKPFOA1.3× the federal limit36K
DUPODUPOPFOS1.3× the federal limit4.7K
FOX LAKEINGLESIDEPFOS1.3× the federal limit12K
MOUNT CARMELMT CARMELPFOS1.2× the federal limit7.0K
ROBINSON-PALESTINE WATER COMMISSIONROBINSONPFOS1.1× the federal limit11K
ROCK ISLAND ARSENAL, US ARMYROCK ISLANDPFOA1.1× the federal limit7.8K
IL AMERICAN-PEKINGODFREYPFOS1.1× the federal limit32K
HOMEWOODHOMEWOODPFOA1.1× the federal limit19K
EAST PEORIAEAST PEORIAPFOS1.1× the federal limit22K
NORTH EAST CENTRAL PWDEDWARDSVILLEPFOS1.0× the federal limit4.0K
PLEASANT VALLEY PWDPEORIAPFHxS1.0× the federal limit3.8K
ROCKTONROCKTONPFHxS93% of federal limit7.7K
LOCKPORTLOCKPORTPFHxS87% of federal limit23K
SUGAR GROVESUGAR GROVEPFHxS80% of federal limit11K
PEORIA HEIGHTSPEORIA HEIGHTSPFHxS65% of federal limit5.9K
ROCKFORD, ILROCKFORDPFHxS64% of federal limit147K
BELVIDEREBELVIDEREPFHxS53% of federal limit25K
BOND/MADISON WATER COMPANYPOCAHONTASPFBABelow detection6.6K
WEE-MA-TUK WATER DISTRICTCUBAPFBABelow detection863
CANTON, ILCANTONPFBABelow detection17K
JERSEY RWCJERSEYVILLEPFBABelow detection13K
AURORAAURORAPFBABelow detection183K
ELGIN, ILELGINPFBABelow detection115K
WILLOW LAKE ESTATES MHPELGINPFBABelow detection920
IL AMERICAN-STREATORGODFREYPFBABelow detection19K
CARYCARYPFPeABelow detection18K
BRIGHTONBRIGHTONPFBABelow detection5.0K
GLEN CARBONGLEN CARBONPFBABelow detection13K
IL AMERICAN-GRANITE CITYGODFREYPFBABelow detection28K
IL AMERICAN-ALTONGODFREYPFBABelow detection46K
MITCHELL PWDGRANITE CITYPFBSBelow detection5.3K
PONTOON BEACH PWDGRANITE CITYPFBABelow detection3.3K
SOUTH JACKSONVILLESOUTH JACKSONVILLEPFBABelow detection3.5K
CHILLICOTHECHILLICOTHE6:2FTSBelow detection6.0K
CHESTERCHESTERPFBABelow detection8.4K

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