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Drinking water / NH

PFAS in New Hampshire drinking water

51 New Hampshire public water systems tested under UCMR5. 18 detected at least one PFAS compound; 33 detected none at the reporting thresholds. Values are the highest single result per compound, in ng/L (parts per trillion). The federal limit for PFOA and PFOS is 4 ng/L.

Water systemServesHighest results (ng/L)Reading
AQUARION WATER/NH

NH1051010

RockinghamPFPeA 25.1PFHxA 10.1PFBA 5PFOA 4.7 *above final limit
CENTRAL HOOKSETT WATER PCT

NH1181010

MerrimackPFBA 28PFOA 4.9 *above final limit
DERRY WATER DEPT

NH0611010

RockinghamPFOA 4.6 *above final limit
EXETER WATER DEPT

NH0801010

RockinghamPFBA 13PFOA 6 *PFPeA 4PFHxA 4above final limit
HAMPSTEAD AREA WATER

NH1031010

RockinghamPFOS 7.5 *PFOA 7.2 *PFBS 7.2PFHxA 5.1above final limit
HUDSON WATER DEPT

NH1201010

HillsboroughPFOA 9 *PFPeA 5PFHxA 4above final limit
JAFFREY WATER WORKS

NH1221010

CheshirePFHxS 11PFOA 6.6 *PFOS 5.6 *above final limit
LITTLE POND ESTATES

NH0192080

HillsboroughPFOA 5.4 *above final limit
MANCHESTER WATER WORKS, NH

NH1471010

HillsboroughPFOA 5 *above final limit
PEMBROKE WATER WORKS

NH1861010

MerrimackPFOS 6.5 *PFBS 5.9above final limit
PEU/LITCHFIELD

NH1371010

HillsboroughPFOA 8.1 *PFPeA 7.8PFHxA 5.4PFHpA 3above final limit
PEU/LONDONDERRY

NH1391010

RockinghamPFOA 6.4 *above final limit
PORTSMOUTH WATER WORKS

NH1951010

RockinghamPFBS 9PFPeA 7PFOA 7 *PFHxA 6above final limit
RYE WATER DIST

NH2041010

RockinghamPFOA 8.3 *PFOS 7.8 *PFHxA 3.6PFPeA 3.1above final limit
SALEM WATER DEPT

NH2051010

RockinghamPFOA 8.5 *PFHxA 3.8PFPeA 3.7above final limit
SEABROOK WATER DEPT

NH2111010

RockinghamPFOA 8 *PFOS 5.3 *PFHxA 4.4above final limit
PEASE TRADE PORT

NH1951020

RockinghamPFBA 20.6detected
RAYMOND WATER DEPT

NH1971010

RockinghamPFHxA 3.1detected

* exceeds the final federal MCL for that compound. Detections of compounds whose limits EPA proposed to rescind in May 2026 are shown for information.

Systems with no PFAS detected

33 tested systems reported no PFAS above the laboratory reporting limits. Each has its own page with its sampling detail.

A detection at the system level does not tell you what reaches one specific tap: levels vary by entry point, treatment train and plumbing. A certified lab test of your own tap settles it. Testing and treatment options