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States → Illinois

LEMONT

PWS ID: IL0311620 · LEMONT, Illinois 60439

PFAS Detected

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

Population Served
17,500
Total Violations
139
Health-Based Violations
86
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
6,396
County
Cook
School/Daycare
No
MCL Violations
86
Monitoring Violations
42
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Combined Radium (-226 and -228) MCL 56 2015
Gross Alpha, Excl. Radon and U MCL 27 1997
Combined Radium (-226 and -228) MR 15 2007
Gross Alpha, Excl. Radon and U MR 12 1997
Coliform (TCR) MR 9 1993
Lead and Copper Rule MR 6 2023
Consumer Confidence Rule Other 4 2014
Coliform (TCR) MCL 3 1998

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 8 of 240 samples detected PFAS.

Contaminant Date Result MRL Status
lithium 9/12/2024 35.8000 µg/L 9 µg/L Detected
lithium 9/12/2024 46.7000 µg/L 9 µg/L Detected
lithium 9/12/2024 34.1000 µg/L 9 µg/L Detected
lithium 9/12/2024 53.8000 µg/L 9 µg/L Detected
PFMBA 3/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 3/7/2024 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 3/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 3/7/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 3/7/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 3/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 3/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 3/7/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFTA 3/7/2024 <0.008 µg/L 0.008 µg/L Not Detected
PFTrDA 3/7/2024 <0.007 µg/L 0.007 µg/L Not Detected
PFBA 3/7/2024 <0.005 µg/L 0.005 µg/L Not Detected
NMeFOSAA 3/7/2024 <0.006 µg/L 0.006 µg/L Not Detected
PFNA 3/7/2024 <0.004 µg/L 0.004 µg/L Not Detected
NEtFOSAA 3/7/2024 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 3/7/2024 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 3/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 3/7/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFUnA 3/7/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFDoA 3/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 3/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
lithium 3/7/2024 50.5000 µg/L 9 µg/L Detected
PFOS 3/7/2024 <0.004 µg/L 0.004 µg/L Not Detected
11Cl-PF3OUdS 3/7/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFHxS 3/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 3/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 3/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpS 3/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 3/7/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOA 3/7/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHxA 3/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 3/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 3/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 3/7/2024 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 3/7/2024 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 3/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 3/7/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 3/7/2024 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 3/7/2024 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 3/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 3/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
11Cl-PF3OUdS 3/7/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBS 3/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 3/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 3/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 3/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 3/7/2024 <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.