EMERALD LAKE
PWS ID: NH1141020 · HILLSBORO, New Hampshire 03244
Population Served
1,300
Total Violations
179
Health-Based Violations
129
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 528
- County
- Hillsborough
- School/Daycare
- No
- MCL Violations
- 122
- Monitoring Violations
- 22
- Treatment Tech Violations
- 7
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Arsenic | MCL | 64 | 2020 |
| Coliform (TCR) | MCL | 30 | 2013 |
| Fluoride | MCL | 28 | 2011 |
| Public Notice | Other | 17 | 2020 |
| Consumer Confidence Rule | Other | 7 | 2016 |
| Groundwater Rule | TT | 7 | 2020 |
| Revised Total Coliform Rule | MON | 4 | 2021 |
| Revised Total Coliform Rule | RPT | 4 | 2021 |
| TTHM | MR | 4 | 2024 |
| Total Haloacetic Acids (HAA5) | MR | 4 | 2024 |
| Fluoride | MR | 3 | 2007 |
| Arsenic | MR | 3 | 2007 |
| E. COLI | MR | 2 | 2016 |
| Lead and Copper Rule | MR | 2 | 1995 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.