ONARGA
PWS ID: IL0750700 · ONARGA, Illinois 60955
Population Served
1,409
Total Violations
33
Health-Based Violations
1
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 500
- County
- Iroquois
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 14
- Treatment Tech Violations
- 1
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Lead and Copper Rule | MR | 5 | 2021 |
| Public Notice | Other | 4 | 2024 |
| Revised Total Coliform Rule | MON | 4 | 2023 |
| Chlorine | MR | 4 | 2023 |
| Consumer Confidence Rule | Other | 2 | 2020 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1977 |
| Lead and Copper Rule | TT | 1 | 1994 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.