TONICA
PWS ID: IL0991150 · TONICA, Illinois 61370
Population Served
705
Total Violations
129
Health-Based Violations
85
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 340
- County
- LaSalle
- School/Daycare
- No
- MCL Violations
- 85
- Monitoring Violations
- 31
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Arsenic | MCL | 72 | 2009 |
| Coliform (TCR) | MR | 15 | 2012 |
| Coliform (TCR) | MCL | 8 | 1997 |
| Public Notice | Other | 6 | 2006 |
| Chlorine | MR | 6 | 2012 |
| Arsenic | MR | 5 | 2006 |
| Nitrite | MCL | 5 | 2011 |
| Nitrate | MR | 4 | 2005 |
| Consumer Confidence Rule | Other | 2 | 2013 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1977 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.