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States → Illinois

OSWEGO

PWS ID: IL0930150 · OSWEGO, Illinois 60543

PFAS Detected

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

Population Served
38,169
Total Violations
285
Health-Based Violations
169
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
12,887
County
Kendall
School/Daycare
No
MCL Violations
169
Monitoring Violations
78
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Combined Radium (-226 and -228) MCL 155 2017
Combined Radium (-226 and -228) MR 17 2016
Gross Alpha, Excl. Radon and U MCL 10 2005
Consumer Confidence Rule Other 9 2022
Coliform (TCR) MR 4 1998
Coliform (TCR) MCL 4 2004
Chlorine MR 4 2024
cis-1,2-Dichloroethylene MR 3 1992
Xylenes, Total MR 3 1992
p-Dichlorobenzene MR 3 1992
1,1-Dichloroethylene MR 3 1992
trans-1,2-Dichloroethylene MR 3 1992
Carbon tetrachloride MR 3 1992
1,2-Dichloropropane MR 3 1992
Trichloroethylene MR 3 1992
Tetrachloroethylene MR 3 1992
Toluene MR 3 1992
Ethylbenzene MR 3 1992
1,2-Dichloroethane MR 3 1992
1,1,1-Trichloroethane MR 3 1992
o-Dichlorobenzene MR 3 1992
CHLOROBENZENE MR 3 1992
Benzene MR 3 1992
Styrene MR 3 1992
Gross Alpha, Excl. Radon and U MR 2 1999
Public Notice Other 2 2017

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 16 of 480 samples detected PFAS.

Contaminant Date Result MRL Status
9Cl-PF3ONS 8/28/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFDoA 8/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
11Cl-PF3OUdS 8/28/2024 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 8/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 8/28/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFHpA 8/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 8/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 8/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 8/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 8/28/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 8/28/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 8/28/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 8/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFTA 8/28/2024 <0.008 µg/L 0.008 µg/L Not Detected
NEtFOSAA 8/28/2024 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 8/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
NMeFOSAA 8/28/2024 <0.006 µg/L 0.006 µg/L Not Detected
PFTrDA 8/28/2024 <0.007 µg/L 0.007 µg/L Not Detected
NFDHA 8/28/2024 <0.02 µg/L 0.02 µg/L Not Detected
HFPO-DA 8/28/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 8/28/2024 <0.005 µg/L 0.005 µg/L Not Detected
lithium 8/28/2024 99.5000 µg/L 9 µg/L Detected
PFPeS 8/28/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFEESA 8/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 8/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 8/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 8/28/2024 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 8/28/2024 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 8/28/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFHpS 8/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFTA 8/28/2024 <0.008 µg/L 0.008 µg/L Not Detected
HFPO-DA 8/28/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFNA 8/28/2024 <0.004 µg/L 0.004 µg/L Not Detected
9Cl-PF3ONS 8/28/2024 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 8/28/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFHxA 8/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 8/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 8/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 8/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
NMeFOSAA 8/28/2024 <0.006 µg/L 0.006 µg/L Not Detected
lithium 8/28/2024 114.0000 µg/L 9 µg/L Detected
PFTrDA 8/28/2024 <0.007 µg/L 0.007 µg/L Not Detected
PFBA 8/28/2024 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 8/28/2024 <0.005 µg/L 0.005 µg/L Not Detected
NEtFOSAA 8/28/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFDoA 8/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
4:2 FTS 8/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 8/28/2024 <0.004 µg/L 0.004 µg/L Not Detected
ADONA 8/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 8/28/2024 <0.002 µg/L 0.002 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.