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States → Illinois

LAKE IN THE HILLS

PWS ID: IL1110400 · LAKE IN THE HILLS, Illinois 60156

PFAS Detected

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

Population Served
28,661
Total Violations
52
Health-Based Violations
18
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
9,590
County
McHenry
School/Daycare
No
MCL Violations
18
Monitoring Violations
18
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 11 2012
Combined Radium (-226 and -228) MCL 7 1984
Coliform (TCR) MR 7 1997
Nitrate MR 5 2006
Barium MR 3 1999
Consumer Confidence Rule Other 2 2012
Public Notice Other 2 2005
Gross Alpha, Excl. Radon and U MR 1 1977
TTHM MR 1 2025
Total Haloacetic Acids (HAA5) MR 1 2025

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 4 of 480 samples detected PFAS.

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