Rockingham County tap water
5 of 12 water systems serving Rockingham County with full PFAS testing averaged above a 2024 federal PFAS level at one or more sampling points.
- 199 community water systems list this county as served; 12 serve 3,300+ people with full PFAS testing.
- 28 had a health-based violation since 2021-10-26.
Largest systems serving this county
| System | Source | People served (whole system) | PFAS above a 2024 level? | Violations since 2021-10-26 |
|---|---|---|---|---|
| Aquarion Water/Nh | Groundwater | 34,000 | No | 0 |
| Portsmouth Water Works | Surface water | 33,000 | Yes | 0 |
| Salem Water dept | Surface water | 21,080 | Yes | 0 |
| Derry Water dept | Purchased surface water | 17,528 | No | 0 |
| Seabrook Water dept | Groundwater | 14,000 | No | 0 |
| Exeter Water dept | Surface water | 12,236 | No | 1 |
| Pease Trade Port | Groundwater | 9,900 | No | 0 |
| Hampstead Area Water | Purchased surface water | 7,153 | Yes | 0 |
| Londonderry | Purchased surface water | 6,255 | Yes | 0 |
| Newmarket Water Works | Groundwater | 5,030 | No | 0 |
| Rye Water Dist | Groundwater | 4,300 | Yes | 1 |
| Raymond Water dept | Groundwater | 3,300 | No | 0 |
Which one is yours? A county usually has several utilities. Your bill or your utility's annual water-quality report names yours. Population is for the whole system, which can cross county lines.
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.