WILLOW LAKE
PWS ID: SD4600370 · WILLOW LAKE, South Dakota 57278
Population Served
255
Total Violations
59
Health-Based Violations
33
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 163
- County
- Clark
- School/Daycare
- No
- MCL Violations
- 25
- Monitoring Violations
- 7
- Treatment Tech Violations
- 8
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 25 | 2001 |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | TT | 8 | 2020 |
| Coliform (TCR) | MR | 5 | 1993 |
| Combined Radium (-226 and -228) | MR | 1 | 1976 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1976 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.