S L M WATER COMMISSION
PWS ID: IL1635090 · MASCOUTAH, Illinois 62258
Population Served
385
Total Violations
33
Health-Based Violations
9
Water Source
Surface Water
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 154
- County
- St. Clair
- School/Daycare
- No
- MCL Violations
- 3
- Monitoring Violations
- 5
- Treatment Tech Violations
- 6
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Long Term 2 Enhanced Surface Water Treatment Rule | TT | 6 | 2014 |
| Atrazine | MCL | 3 | 1995 |
| Coliform (TCR) | MR | 2 | 2006 |
| Chloramine | MR | 2 | 2006 |
| 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.