LITTLE SWAN LAKE SD
PWS ID: IL1875050 · MONMOUTH, Illinois 61462
Population Served
438
Total Violations
56
Health-Based Violations
16
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 175
- County
- Warren
- School/Daycare
- No
- MCL Violations
- 16
- Monitoring Violations
- 26
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 18 | 1998 |
| Fluoride | MCL | 13 | 1984 |
| Chlorine | MR | 4 | 2007 |
| Lead and Copper Rule | MR | 3 | 2025 |
| Coliform (TCR) | MCL | 3 | 1997 |
| Consumer Confidence Rule | Other | 2 | 2011 |
| 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.