NEW CASTLE WATER WORKS
PWS ID: NH1661010 · PORTSMOUTH, New Hampshire 03801
Population Served
910
Total Violations
115
Health-Based Violations
83
Water Source
Surface Water
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 365
- County
- Rockingham
- School/Daycare
- No
- MCL Violations
- 81
- Monitoring Violations
- 30
- Treatment Tech Violations
- 2
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| TTHM | MCL | 66 | 2018 |
| Coliform (TCR) | MCL | 15 | 1995 |
| Total Haloacetic Acids (HAA5) | MR | 8 | 2010 |
| TTHM | MR | 8 | 2010 |
| Chlorine | MR | 8 | 2016 |
| Lead and Copper Rule | MR | 6 | 2023 |
| Consumer Confidence Rule | Other | 2 | 2008 |
| Lead and Copper Rule | TT | 2 | 1994 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.