Results from entry points (water leaving treatment, not household taps) of public water systems sampled under EPA's Fifth Unregulated Contaminant Monitoring Rule. Click a county to see every water system serving it, or turn on service areas and click a location to see the systems that serve that spot.
51 of the 1,160 public water systems listed for New Hampshire were sampled. Sorted by the highest single result relative to EPA's 2024 limits. Each name links to a page with all of that system's results. All 1,160 New Hampshire systems, including those not tested · Download all New Hampshire results (CSV, gzip)
| System | PWSID | City | Population | PFOA (ppt) | PFOS (ppt) | HI | Highest single result |
|---|---|---|---|---|---|---|---|
| Hudson Water Dept | NH1201010 | Goffstown | 16,700 | 9 | <MRL | 0 | PFOA 1–3 × its limit |
| Salem Water Dept | NH2051010 | Salem | 21,080 | 8.5 | <MRL | 0 | PFOA 1–3 × its limit |
| Rye Water Dist | NH2041010 | Rye | 4,300 | 8.3 | 7.8 | 0 | PFOA 1–3 × its limit |
| Litchfield | NH1371010 | Nashua | 6,920 | 8.1 | <MRL | 0 | PFOA 1–3 × its limit |
| Seabrook Water Dept | NH2111010 | Seabrook | 14,000 | 8 | 5.3 | 0 | PFOA 1–3 × its limit |
| Hampstead Area Water | NH1031010 | Atkinson | 7,153 | 7.2 | 7.5 | 0.004 | PFOS 1–3 × its limit |
| Portsmouth Water Works | NH1951010 | Portsmouth | 33,000 | 7 | 5 | 0.501 | PFOA 1–3 × its limit |
| Jaffrey Water Works | NH1221010 | Jaffrey | 3,800 | 6.6 | 5.6 | 1.1 | PFOA 1–3 × its limit |
| Pembroke Water Works | NH1861010 | Pembroke | 5,200 | <MRL | 6.5 | 0.003 | PFOS 1–3 × its limit |
| Londonderry | NH1391010 | Nashua | 6,255 | 6.4 | <MRL | 0 | PFOA 1–3 × its limit |
| Exeter Water Dept | NH0801010 | Exeter | 12,236 | 6 | 4 | 0.002 | PFOA 1–3 × its limit |
| Little Pond Estates | NH0192080 | Nashua | 3,000 | 5.4 | <MRL | 0 | PFOA 1–3 × its limit |
| Manchester Water Works | NH1471010 | Manchester | 123,500 | 5 | <MRL | 0 | PFOA 1–3 × its limit |
| Central Hooksett Water Pct | NH1181010 | Hooksett | 4,650 | 4.9 | <MRL | 0 | PFOA 1–3 × its limit |
| Aquarion Water/Nh | NH1051010 | Monroe | 34,000 | 4.7 | 4.5 | 0 | PFOA 1–3 × its limit |
| Derry Water Dept | NH0611010 | Derry | 17,528 | 4.6 | <MRL | 0 | PFOA 1–3 × its limit |
| Pease Trade Port | NH1951020 | Portsmouth | 9,900 | <MRL | <MRL | 0 | Other PFAS detected |
| Raymond Water Dept | NH1971010 | Raymond | 3,300 | <MRL | <MRL | 0 | Other PFAS detected |
| Berlin Water Works | NH0231010 | Berlin | 9,575 | <MRL | <MRL | 0 | No PFAS detected |
| Bristol Water Works | NH0301010 | Bristol | 3,575 | <MRL | <MRL | 0 | No PFAS detected |
| Claremont Water Dept | NH0461010 | Claremont | 9,000 | <MRL | <MRL | 0 | No PFAS detected |
| Concord Water Dept | NH0501010 | Concord | 44,215 | <MRL | <MRL | 0 | No PFAS detected |
| Dover Water Dept | NH0651010 | Dover | 29,000 | <MRL | <MRL | 0 | No PFAS detected |
| Farley Rd Estates | NH1622010 | Nashua | 85 | <MRL | <MRL | 0 | No PFAS detected |
| Franklin Water Works | NH0851010 | Franklin | 7,200 | <MRL | <MRL | 0 | No PFAS detected |
| Hanover Water Dept | NH1071010 | Hanover | 9,600 | <MRL | <MRL | 0 | No PFAS detected |
| Keene Water Dept | NH1241010 | Keene | 30,000 | <MRL | <MRL | 0 | No PFAS detected |
| Laconia Water Works | NH1281010 | Laconia | 17,125 | <MRL | <MRL | 0 | No PFAS detected |
| Lebanon Water Dept | NH1321010 | Lebanon | 13,600 | <MRL | <MRL | 0 | No PFAS detected |
| Littleton Water And Light | NH1381010 | Littleton | 6,500 | <MRL | <MRL | 0 | No PFAS detected |
| Lower Bartlett Water Pct | NH0161020 | Intervale | 3,850 | <MRL | <MRL | 0 | No PFAS detected |
| Merrimack Village Dist | NH1531010 | Merrimack | 25,500 | <MRL | <MRL | 0 | No PFAS detected |
| Milford Water Utilities Dept | NH1561010 | Milford | 9,500 | <MRL | <MRL | 0 | No PFAS detected |
| New London Springfield Water | NH1721010 | New London | 3,250 | <MRL | <MRL | 0 | No PFAS detected |
| Newmarket Water Works | NH1731010 | Newmarket | 5,030 | <MRL | <MRL | 0 | No PFAS detected |
| Newport Water Works | NH1741010 | Newport | 5,000 | <MRL | <MRL | 0 | No PFAS detected |
| North Conway Water Pct | NH0511030 | North Conway | 5,500 | <MRL | <MRL | 0 | No PFAS detected |
| Penacook Boscawen Water Pct | NH0251010 | Nashua | 3,800 | <MRL | <MRL | 0 | No PFAS detected |
| Pennichuck Water Works | NH1621010 | Nashua | 88,853 | <MRL | <MRL | 0 | No PFAS detected |
| Peterborough Water Works | NH1871010 | Peterborough | 4,500 | <MRL | <MRL | 0 | No PFAS detected |
| Plymouth Vlg Water And Sewer | NH1941010 | Plymouth | 6,700 | <MRL | <MRL | 0 | No PFAS detected |
| River Run Condos | NH0162170 | North Conway | 750 | <MRL | <MRL | 0 | No PFAS detected |
| Rochester Water Dept | NH2001010 | Rochester | 25,000 | <MRL | <MRL | 0 | No PFAS detected |
| Saco River Forest | NH0512120 | Freedom | 63 | <MRL | <MRL | 0 | No PFAS detected |
| Somersworth Water Works | NH2151010 | Somersworth | 12,200 | <MRL | <MRL | 0 | No PFAS detected |
| Unh/Durham Water Sys | NH0691010 | Durham | 16,000 | <MRL | <MRL | 0 | No PFAS detected |
| United Natural Foods | NH0446020 | Minneapolis | 330 | <MRL | <MRL | 0 | No PFAS detected |
| Village Dist Of Eastman | NH0951010 | Grantham | 3,400 | <MRL | <MRL | 0 | No PFAS detected |
| Village District Of Eidelweiss | NH1461010 | Madison | 1,200 | <MRL | <MRL | 0 | No PFAS detected |
| Wolfeboro Water And Sewer | NH2561010 | Wolfeboro | 6,000 | <MRL | <MRL | 0 | No PFAS detected |
| Yankee Book Peddler | NH1196050 | Hopkinton | 240 | <MRL | <MRL | 0 | No PFAS detected |
Highest single result for each system; PFOA and PFOS in ppt (ng/L). Entry-point samples, not tap water; screening comparisons, not compliance determinations.