VERNON HILLS - LAKE CO PW
PWS ID: IL0971750 · LIBERTYVILLE, Illinois 60048
Population Served
33,207
Total Violations
64
Health-Based Violations
30
Water Source
Surface Water
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 11,069
- County
- Lake
- School/Daycare
- No
- MCL Violations
- 30
- Monitoring Violations
- 14
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Combined Radium (-226 and -228) | MCL | 24 | 1989 |
| Coliform (TCR) | MR | 9 | 1995 |
| Coliform (TCR) | MCL | 6 | 1994 |
| TTHM | MR | 4 | 2024 |
| Consumer Confidence Rule | Other | 2 | 2012 |
| 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 |
|---|---|---|---|---|
| 9Cl-PF3ONS | 9/12/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 11Cl-PF3OUdS | 9/12/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFUnA | 9/12/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFHxA | 9/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDoA | 9/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDA | 9/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFOA | 9/12/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFNA | 9/12/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| ADONA | 9/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxS | 9/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpA | 9/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBS | 9/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFOS | 9/12/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHpS | 9/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| HFPO-DA | 9/12/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| lithium | 9/12/2024 | <9 µg/L | 9 µg/L | Not Detected |
| NFDHA | 9/12/2024 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFPeS | 9/12/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFMBA | 9/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeA | 9/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMPA | 9/12/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| 8:2 FTS | 9/12/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 4:2 FTS | 9/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 6:2 FTS | 9/12/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFBA | 9/12/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFEESA | 9/12/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBS | 6/26/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpA | 6/26/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxS | 6/26/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFEESA | 6/26/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeS | 6/26/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| NFDHA | 6/26/2024 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFHpS | 6/26/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFTA | 6/26/2024 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFTrDA | 6/26/2024 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| NEtFOSAA | 6/26/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFNA | 6/26/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| lithium | 6/26/2024 | <9 µg/L | 9 µg/L | Not Detected |
| PFMPA | 6/26/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| NMeFOSAA | 6/26/2024 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| PFBA | 6/26/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFDoA | 6/26/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxA | 6/26/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFUnA | 6/26/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 11Cl-PF3OUdS | 6/26/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 9Cl-PF3ONS | 6/26/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| ADONA | 6/26/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMBA | 6/26/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| HFPO-DA | 6/26/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFOS | 6/26/2024 | <0.004 µg/L | 0.004 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.