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CRYSTAL LAKE

PWS ID: IL1110150 · CRYSTAL LAKE, Illinois 60014

PFAS Detected

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

Population Served
40,661
Total Violations
54
Health-Based Violations
22
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
14,101
County
McHenry
School/Daycare
No
MCL Violations
22
Monitoring Violations
28
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Barium MCL 19 1986
Selenium MR 4 1986
Chromium MR 4 1986
Fluoride MR 4 1986
Mercury MR 4 1986
Nitrate MR 4 1986
Coliform (TCR) MCL 3 1996
Coliform (TCR) MR 3 1996
Cadmium MR 2 1986
Gross Alpha, Excl. Radon and U MR 1 1977
Arsenic MR 1 1986
Barium MR 1 1986

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 2 of 300 samples detected PFAS.

Contaminant Date Result MRL Status
PFTrDA 9/9/2025 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 9/9/2025 <0.008 µg/L 0.008 µg/L Not Detected
NEtFOSAA 9/9/2025 <0.005 µg/L 0.005 µg/L Not Detected
lithium 9/9/2025 <9 µg/L 9 µg/L Not Detected
NMeFOSAA 9/9/2025 <0.006 µg/L 0.006 µg/L Not Detected
NEtFOSAA 6/11/2025 <0.005 µg/L 0.005 µg/L Not Detected
11Cl-PF3OUdS 6/11/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 6/11/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 6/11/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 6/11/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 6/11/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFTA 6/11/2025 <0.008 µg/L 0.008 µg/L Not Detected
9Cl-PF3ONS 6/11/2025 <0.002 µg/L 0.002 µg/L Not Detected
lithium 6/11/2025 <9 µg/L 9 µg/L Not Detected
NFDHA 6/11/2025 <0.02 µg/L 0.02 µg/L Not Detected
PFPeA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
ADONA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFTrDA 6/11/2025 <0.007 µg/L 0.007 µg/L Not Detected
PFHpS 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 6/11/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFMBA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
NMeFOSAA 6/11/2025 <0.006 µg/L 0.006 µg/L Not Detected
PFMPA 6/11/2025 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 6/11/2025 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 6/11/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 6/11/2025 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 6/11/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFHxS 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
NMeFOSAA 6/11/2025 <0.006 µg/L 0.006 µg/L Not Detected
NEtFOSAA 6/11/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 6/11/2025 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 6/11/2025 <0.008 µg/L 0.008 µg/L Not Detected
HFPO-DA 6/11/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFHpS 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 6/11/2025 <0.004 µg/L 0.004 µg/L Not Detected
NFDHA 6/11/2025 <0.02 µg/L 0.02 µg/L Not Detected
PFEESA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 6/11/2025 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 6/11/2025 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 6/11/2025 <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.