COLCHESTER
PWS ID: IL1090200 · COLCHESTER, Illinois 62326
Population Served
1,395
Total Violations
172
Health-Based Violations
125
Water Source
Surface Water
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 620
- County
- McDonough
- School/Daycare
- No
- MCL Violations
- 76
- Monitoring Violations
- 21
- Treatment Tech Violations
- 49
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Combined Radium (-226 and -228) | MCL | 60 | 2005 |
| Interim Enhanced Surface Water Treatment Rule | TT | 49 | 2008 |
| Coliform (TCR) | MR | 16 | 2009 |
| Gross Alpha, Excl. Radon and U | MCL | 12 | 2005 |
| Combined Radium (-226 and -228) | MR | 4 | 2003 |
| Coliform (TCR) | MCL | 4 | 2005 |
| Public Notice | Other | 2 | 2008 |
| 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.