SENECA
PWS ID: IL0991050 · SENECA, Illinois 61360
Population Served
2,353
Total Violations
151
Health-Based Violations
106
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 896
- County
- LaSalle
- School/Daycare
- No
- MCL Violations
- 106
- Monitoring Violations
- 27
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Combined Radium (-226 and -228) | MCL | 104 | 2005 |
| Coliform (TCR) | MR | 11 | 1994 |
| Combined Radium (-226 and -228) | MR | 7 | 2003 |
| Total Haloacetic Acids (HAA5) | MR | 4 | 2015 |
| TTHM | MR | 4 | 2015 |
| Coliform (TCR) | MCL | 2 | 1992 |
| 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.