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States → Illinois

CARY

PWS ID: IL1110100 · CARY, Illinois 60013

PFAS Detected

5 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

Population Served
17,826
Total Violations
66
Health-Based Violations
48
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
6,469
County
McHenry
School/Daycare
No
MCL Violations
46
Monitoring Violations
9
Treatment Tech Violations
2

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Barium MCL 20 1995
Gross Alpha, Excl. Radon and U MCL 13 1984
Combined Radium (-226 and -228) MCL 7 1984
Coliform (TCR) MR 6 1993
Coliform (TCR) MCL 6 1992
Consumer Confidence Rule Other 3 2025
Lead and Copper Rule MR 2 1993
Lead and Copper Rule TT 2 1992
Gross Alpha, Excl. Radon and U MR 1 1977

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 5 of 330 samples detected PFAS.

Contaminant Date Result MRL Status
PFHpS 7/16/2024 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 7/16/2024 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 7/16/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBA 7/16/2024 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 7/16/2024 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 7/16/2024 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 7/16/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 7/16/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 7/16/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 7/16/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 7/16/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 7/16/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 7/16/2024 <0.004 µg/L 0.004 µg/L Not Detected
9Cl-PF3ONS 7/16/2024 <0.002 µg/L 0.002 µg/L Not Detected
NFDHA 7/16/2024 <0.02 µg/L 0.02 µg/L Not Detected
NEtFOSAA 7/16/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFOA 7/16/2024 <0.004 µg/L 0.004 µg/L Not Detected
NMeFOSAA 7/16/2024 <0.006 µg/L 0.006 µg/L Not Detected
PFTA 7/16/2024 <0.008 µg/L 0.008 µg/L Not Detected
11Cl-PF3OUdS 7/16/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 7/16/2024 <0.007 µg/L 0.007 µg/L Not Detected
lithium 7/16/2024 <9 µg/L 9 µg/L Not Detected
PFBS 7/16/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 7/16/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 7/16/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 7/16/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFOS 7/16/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFDA 7/16/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 7/16/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 7/16/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFTA 5/29/2024 <0.008 µg/L 0.008 µg/L Not Detected
PFMBA 5/29/2024 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 5/29/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 5/29/2024 <0.004 µg/L 0.004 µg/L Not Detected
6:2 FTS 5/29/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFPeA 5/29/2024 <0.003 µg/L 0.003 µg/L Not Detected
4:2 FTS 5/29/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 5/29/2024 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 5/29/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFPeS 5/29/2024 <0.004 µg/L 0.004 µg/L Not Detected
lithium 5/29/2024 <9 µg/L 9 µg/L Not Detected
PFTrDA 5/29/2024 <0.007 µg/L 0.007 µg/L Not Detected
ADONA 5/29/2024 <0.003 µg/L 0.003 µg/L Not Detected
NEtFOSAA 5/29/2024 <0.005 µg/L 0.005 µg/L Not Detected
NMeFOSAA 5/29/2024 <0.006 µg/L 0.006 µg/L Not Detected
PFHpS 5/29/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 5/29/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBA 5/29/2024 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 5/29/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFHpA 5/29/2024 <0.003 µg/L 0.003 µg/L Not Detected
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.