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States → Illinois

OAK BROOK

PWS ID: IL0430700 · OAK BROOK, Illinois 60523

Population Served
9,400
Total Violations
54
Health-Based Violations
35
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
3,295
County
DuPage
School/Daycare
No
MCL Violations
35
Monitoring Violations
13
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Combined Radium (-226 and -228) MCL 22 1989
Gross Alpha, Excl. Radon and U MCL 13 1985
Chlorine MR 4 2005
Lead and Copper Rule MR 4 2023
Total Haloacetic Acids (HAA5) MR 4 2024
Consumer Confidence Rule Other 2 2024
Gross Alpha, Excl. Radon and U MR 1 1977

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 120 samples detected PFAS.

Contaminant Date Result MRL Status
lithium 9/19/2023 <9 µg/L 9 µg/L Not Detected
4:2 FTS 5/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 5/9/2024 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 5/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 5/9/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 5/9/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 5/9/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 5/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 5/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 5/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
11Cl-PF3OUdS 5/9/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFPeS 5/9/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 5/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpS 5/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 5/9/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFUnA 5/9/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 5/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 5/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 5/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 5/9/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 5/9/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHpA 5/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 5/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
lithium 5/9/2024 <9 µg/L 9 µg/L Not Detected
PFTA 5/9/2024 <0.008 µg/L 0.008 µg/L Not Detected
PFTrDA 5/9/2024 <0.007 µg/L 0.007 µg/L Not Detected
NEtFOSAA 5/9/2024 <0.005 µg/L 0.005 µg/L Not Detected
NMeFOSAA 5/9/2024 <0.006 µg/L 0.006 µg/L Not Detected
8:2 FTS 5/9/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFOS 5/9/2024 <0.004 µg/L 0.004 µg/L Not Detected
6:2 FTS 5/9/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFEESA 2/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 2/8/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 2/8/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 2/8/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 2/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 2/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 2/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 2/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 2/8/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFMBA 2/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
lithium 2/8/2024 <9 µg/L 9 µg/L Not Detected
PFPeA 2/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpS 2/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
NEtFOSAA 2/8/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 2/8/2024 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 2/8/2024 <0.008 µg/L 0.008 µg/L Not Detected
PFPeS 2/8/2024 <0.004 µg/L 0.004 µg/L Not Detected
6:2 FTS 2/8/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFDoA 2/8/2024 <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.