COGSWELL SPRINGS WATER WORKS
PWS ID: NH1121010 · HENNIKER, New Hampshire 03242
Population Served
3,000
Total Violations
42
Health-Based Violations
20
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 581
- County
- Merrimack
- School/Daycare
- No
- MCL Violations
- 20
- Monitoring Violations
- 18
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 20 | 2010 |
| Coliform (TCR) | MR | 8 | 2010 |
| E. COLI | MR | 8 | 2017 |
| Consumer Confidence Rule | Other | 2 | 2010 |
| Lead and Copper Rule | MR | 2 | 2019 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.