PFAS in New Hampshire tap water

16 of 51 tested systems measured above the federal limit. 18 had a detection of any kind.

Every public water system below was required by the EPA to test for 29 PFAS compounds. Sorted by the highest PFOA or PFOS reading, worst first. Find yours for the full set of readings and what removes them.

Water system	Highest PFOA	Highest PFOS	Found	Against the 4 ppt limit
Hudson Water Dept	9 ppt	none detected	3 of 29	Above
Salem Water Dept	8.5 ppt	none detected	3 of 29	Above
Rye Water Dist	8.3 ppt	7.8 ppt	4 of 29	Above
Peu/litchfield	8.1 ppt	none detected	4 of 29	Above
Seabrook Water Dept	8 ppt	5.3 ppt	3 of 29	Above
Hampstead Area Water	7.2 ppt	7.5 ppt	5 of 29	Above
Portsmouth Water Works	7 ppt	5 ppt	8 of 29	Above
Jaffrey Water Works	6.6 ppt	5.6 ppt	3 of 29	Above
Pembroke Water Works	none detected	6.5 ppt	2 of 29	Above
Peu/londonderry	6.4 ppt	none detected	1 of 29	Above
Exeter Water Dept	6 ppt	4 ppt	7 of 29	Above
Little Pond Estates	5.4 ppt	none detected	1 of 29	Above
Manchester Water Works, Nh	5 ppt	none detected	1 of 29	Above
Central Hooksett Water Pct	4.9 ppt	none detected	2 of 29	Above
Aquarion Water/nh	4.7 ppt	4.5 ppt	5 of 29	Above
Derry Water Dept	4.6 ppt	none detected	1 of 29	Above
Berlin Water Works	none detected	none detected	0 of 29	Within
Bristol Water Works	none detected	none detected	0 of 29	Within
Claremont Water Dept	none detected	none detected	0 of 29	Within
Concord Water Dept, Nh	none detected	none detected	0 of 29	Within
Dover Water Dept, Nh	none detected	none detected	0 of 29	Within
Franklin Water Works	none detected	none detected	0 of 29	Within
Hanover Water Dept	none detected	none detected	0 of 29	Within
Keene Water Dept	none detected	none detected	0 of 29	Within
Laconia Water Works	none detected	none detected	0 of 29	Within
Lebanon Water Dept	none detected	none detected	0 of 29	Within
Littleton Water and Light Dept	none detected	none detected	0 of 29	Within
Lower Bartlett Water Pct	none detected	none detected	0 of 29	Within
Merrimack Village Dist	none detected	none detected	0 of 29	Within
Milford Water Utilities Dept	none detected	none detected	0 of 29	Within
New London Springfield Water	none detected	none detected	0 of 29	Within
Newmarket Water Works	none detected	none detected	0 of 29	Within
Newport Water Works	none detected	none detected	0 of 29	Within
North Conway Water Pct	none detected	none detected	0 of 29	Within
Pease Trade Port	none detected	none detected	1 of 29	Within
Penacook Boscawen Water Pct	none detected	none detected	0 of 29	Within
Pennichuck Water Works	none detected	none detected	0 of 29	Within
Peterborough Water Works	none detected	none detected	0 of 29	Within
Plymouth Vlg Water and Sewer	none detected	none detected	0 of 29	Within
Pww/farley Rd Estates	none detected	none detected	0 of 29	Within
Raymond Water Dept	none detected	none detected	1 of 29	Within
River Run Condos	none detected	none detected	0 of 29	Within
Rochester Water Dept	none detected	none detected	0 of 29	Within
Saco River Forest	none detected	none detected	0 of 29	Within
Somersworth Water Works	none detected	none detected	0 of 29	Within
Unh/durham Water Sys	none detected	none detected	0 of 29	Within
United Natural Foods	none detected	none detected	0 of 29	Within
Village Dist of Eastman	none detected	none detected	0 of 29	Within
Village District of Eidelweiss	none detected	none detected	0 of 29	Within
Wolfeboro Water and Sewer	none detected	none detected	0 of 29	Within
Yankee Book Peddler	none detected	none detected	0 of 29	Within

All 51 systems the EPA tested in New Hampshire, every one of them with its own page. Each was tested for 29 PFAS compounds.

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Source, the EPA’s fifth Unregulated Contaminant Monitoring Rule, final dataset published 2026-10-15. Original data →