OAK LAWN Water Quality Report
Population
58,362
people served
Water Source
🌊 Surface
rivers, lakes, reservoirs
National Rank
Top 90%
of 49,184 US systems
5-Year Record
⚠️ 7
violations recorded
C
Fair
Safety Grade
7 violations in the past 5 years, including 2 health-based
System Details
- PWSID
- IL0312220
- Population Served
- 58,362
- Water Source
- Surface Water
- Owner
- Local Government
- State
- Illinois
- EPA Region
- 5
Contaminants of Concern
| Contaminant | Status | Violations |
|---|---|---|
| Contaminant 5000 | ✕ Health-Based | 5 |
| Contaminant 7000 | ⚠ Monitoring/Reporting | 6 |
Violation History
2025
1
2023
3
2022
3
2016
2
1993
1
1992
1
Total violations on record: 11
Service Area
Cities Served
ZIP Codes Served
How does this compare?
This systemNational average
Grade C
Avg: B-C
11violations total
39% of national average
National avg: ~28 per system
📍 Mid-to-large system — serves 9× the national average.