PFAS in New Hampshire drinking water
EPA's final UCMR 5 data covers 51 public water systems in New Hampshire, serving about 732,425 people. PFAS turned up in 18 of them (35%). 9 averaged above at least one EPA limit at a sampling point, affecting about 222,628 people.
Highest PFOA and PFOS averages among systems serving 1,000 or more: Rye Water Dist (7.0 / 6.8 ppt), Portsmouth Water Works (6.0 / 4.5 ppt), Hampstead Area Water (6.2 / 3.8 ppt), Jaffrey Water Works (5.9 / 2.8 ppt) and Hudson Water Dept (8.0 / 0.0 ppt).
Every tested system in New Hampshire
Largest first. PFOA and PFOS columns show the average at each system's worst sampling point; EPA's limit for each is 4 ppt. Filter by name:
| Water system | People | PFOA | PFOS | PFAS found | Result |
|---|---|---|---|---|---|
| Manchester Water Works · Manchester | 123,500 | 4.5 | - | 1 | Above limit |
| Pennichuck Water Works · Nashua | 88,853 | - | - | 0 | None found |
| Concord Water Dept · Concord | 44,215 | - | - | 0 | None found |
| Aquarion Water/nh · Monroe | 34,000 | 2.4 | 2.2 | 5 | Sample at limit |
| Portsmouth Water Works · Portsmouth | 33,000 | 6.0 | 4.5 | 8 | Above limit |
| Keene Water Dept · Keene | 30,000 | - | - | 0 | None found |
| Dover Water Dept · Dover | 29,000 | - | - | 0 | None found |
| Merrimack Village Dist · Merrimack | 25,500 | - | - | 0 | None found |
| Rochester Water Dept · Rochester | 25,000 | - | - | 0 | None found |
| Salem Water Dept · Salem | 21,000 | 7.5 | - | 3 | Above limit |
| Derry Water Dept · Derry | 17,370 | 3.2 | - | 1 | Sample at limit |
| Laconia Water Works · Laconia | 17,125 | - | - | 0 | None found |
| Hudson Water Dept · Hudson | 16,700 | 8.0 | - | 3 | Above limit |
| Unh/durham Water Sys · Durham | 16,000 | - | - | 0 | None found |
| Seabrook Water Dept · Seabrook | 14,000 | 2.2 | 0.9 | 3 | Sample at limit |
| Lebanon Water Dept · Lebanon | 13,600 | - | - | 0 | None found |
| Exeter Water Dept · Exeter | 12,236 | 2.8 | 2.0 | 7 | Sample at limit |
| Somersworth Water Works · Somersworth | 12,200 | - | - | 0 | None found |
| Pease Trade Port · Portsmouth | 9,900 | - | - | 1 | Below limits |
| Hanover Water Dept · Hanover | 9,600 | - | - | 0 | None found |
| Berlin Water Works · Berlin | 9,575 | - | - | 0 | None found |
| Milford Water Utilities Dept · Milford | 9,500 | - | - | 0 | None found |
| Claremont Water Dept · Claremont | 9,000 | - | - | 0 | None found |
| Franklin Water Works · Franklin | 7,200 | - | - | 0 | None found |
| Hampstead Area Water · Atkinson | 7,153 | 6.2 | 3.8 | 5 | Above limit |
| Peu/litchfield · Nashua | 6,920 | 7.4 | - | 4 | Above limit |
| Plymouth Vlg Water and Sewer · Plymouth | 6,700 | - | - | 0 | None found |
| Littleton Water and Light Dept · Littleton | 6,500 | - | - | 0 | None found |
| Peu/londonderry · Nashua | 6,255 | 4.2 | - | 1 | Above limit |
| Wolfeboro Water and Sewer · Wolfeboro | 6,000 | - | - | 0 | None found |
| North Conway Water Pct · North Conway | 5,500 | - | - | 0 | None found |
| Pembroke Water Works · Pembroke | 5,200 | - | 3.2 | 2 | Sample at limit |
| Newmarket Water Works · Newmarket | 5,030 | - | - | 0 | None found |
| Newport Water Works · Newport | 5,000 | - | - | 0 | None found |
| Central Hooksett Water Pct · Hooksett | 4,650 | 3.5 | - | 2 | Sample at limit |
| Peterborough Water Works · Peterborough | 4,500 | - | - | 0 | None found |
| Rye Water Dist · Rye | 4,300 | 7.0 | 6.8 | 4 | Above limit |
| Lower Bartlett Water Pct · Intervale | 3,850 | - | - | 0 | None found |
| Penacook Boscawen Water Pct · Nashua | 3,800 | - | - | 0 | None found |
| Jaffrey Water Works · Jaffrey | 3,800 | 5.9 | 2.8 | 3 | Above limit |
| Bristol Water Works · Bristol | 3,575 | - | - | 0 | None found |
| Village Dist of Eastman · Grantham | 3,400 | - | - | 0 | None found |
| Raymond Water Dept · Raymond | 3,300 | - | - | 1 | Below limits |
| New London Springfield Water · New London | 3,250 | - | - | 0 | None found |
| Little Pond Estates · Nashua | 3,000 | 3.8 | - | 1 | Sample at limit |
| Village District of Eidelweiss · Madison | 1,200 | - | - | 0 | None found |
| River Run Condos · North Conway | 750 | - | - | 0 | None found |
| United Natural Foods · Minneapolis | 330 | - | - | 0 | None found |
| Yankee Book Peddler · Ipswich | 240 | - | - | 0 | None found |
| Pww/farley Rd Estates · Nashua | 85 | - | - | 0 | None found |
| Saco River Forest · Freedom | 63 | - | - | 0 | None found |
On a private well in New Hampshire?
EPA's program only covers public systems. Private wells are never part of UCMR 5, so the only way to know is to test. Our well testing guide covers which lab tests to order, and the best well water systems covers what to install once you have results.
Cite this page
Well & Tap. "PFAS in New Hampshire drinking water: results for 51 systems." Data: U.S. EPA UCMR 5, final release August 2026. https://wellandtap.com/pfas/new-hampshire/
Source: EPA UCMR 5 final occurrence data (August 2026); population from EPA SDWIS. Method.