BLACK HILLS NF-COOK LAKE CG
PWS ID: WY5680010 · SPEARFISH, Wyoming 57783
Population Served
165
Total Violations
17
Health-Based Violations
10
Water Source
Groundwater
System Details
- System Type
- Transient Non-Community
- Owner Type
- Federal
- Connections
- 1
- County
- Crook
- School/Daycare
- No
- MCL Violations
- 10
- Monitoring Violations
- 5
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 8 | 2013 |
| Revised Total Coliform Rule | MON | 3 | 2025 |
| Coliform (TCR) | MR | 2 | 1992 |
| Revised Total Coliform Rule | MCL | 2 | 2016 |
| Revised Total Coliform Rule | Other | 1 | 2018 |
| Revised Total Coliform Rule | RPT | 1 | 2025 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.