New Hampshire tap water
9 of 49 New Hampshire water systems with full PFAS testing (18%) averaged above a 2024 federal PFAS level at one or more sampling points.
- 706 active community water systems in the EPA file; 43 serve 3,300+ people and have a full PFAS set.
- 112 systems had at least one health-based violation since 2021-10-26.
- 227 systems report a lead 90th percentile above 15 ppb (some results are old; check each system page).
Largest systems
| System | People served | PFAS above a 2024 level? | Health-based violations since 2021-10-26 |
|---|---|---|---|
| Manchester Water Works | 123,500 | Yes, at one or more sampling points | 0 |
| Pennichuck Water Works | 88,853 | No | 0 |
| Concord Water dept | 44,215 | No | 0 |
| Aquarion Water/Nh | 34,000 | No | 0 |
| Portsmouth Water Works | 33,000 | Yes, at one or more sampling points | 0 |
| Keene Water dept | 30,000 | No | 0 |
| Dover Water dept | 29,000 | No | 0 |
| Merrimack Village Dist | 25,500 | No | 0 |
Counties
All 3 utilities with a page in New Hampshire
- Concord Water dept 44,215
- Manchester Water Works 123,500
- Pennichuck Water Works 88,853
Why not "the state's water quality"? You drink from one utility, not a state. Rollups count systems, not people, so one large utility counts the same as a small one. Use the system pages for your actual water.
Not medical or legal advice. UCMR 5 results are screening data, not compliance determinations.
Sources and freshness
Public-water-system facts, violations and lead/copper results: EPA ECHO SDWA download (SDWIS snapshot 2026-10-13). PFAS and lithium results: EPA UCMR 5 final data (sampling 2023–2025). Both are U.S. government works, downloaded 2026-10-26. Numbers are computed by the published method; the same fields are in the open data files.