MAQUON
PWS ID: IL0950350 · MAQUON, Illinois 61458
Population Served
218
Total Violations
89
Health-Based Violations
16
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 149
- County
- Knox
- School/Daycare
- No
- MCL Violations
- 16
- Monitoring Violations
- 64
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Fluoride | MCL | 16 | 1999 |
| Fluoride | MR | 14 | 2009 |
| Nitrate | MR | 8 | 1994 |
| Coliform (TCR) | MR | 6 | 1995 |
| Chromium | MR | 4 | 1986 |
| Revised Total Coliform Rule | MON | 4 | 2024 |
| Chlorine | MR | 4 | 2024 |
| Selenium | MR | 4 | 1986 |
| Barium | MR | 4 | 1986 |
| Cadmium | MR | 4 | 1986 |
| Arsenic | MR | 4 | 1986 |
| Mercury | MR | 4 | 1986 |
| Lead and Copper Rule | MR | 2 | 2022 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1977 |
| Total Haloacetic Acids (HAA5) | MR | 1 | 2023 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.