All 46 systems had enough required samples to calculate a yearly average. 8 had at least one yearly average at or above a study benchmark; 38 did not.
EPA-based study benchmark: the unrounded cutoff this research uses to reproduce EPA’s January 2026 technical-assistance classification around the April 2024 federal levels. It is not a current standard or compliance finding and cannot determine household exposure or health risk.
Find your water system
ZIP codes are used only to route visitors to public water systems that reported serving them. Confirm the actual provider using a water bill or utility record.
System counts in New Hampshire
Each count shows how many included water systems had a yearly average at or above the named study benchmark.
| Study benchmark | Systems at or above benchmark | Water systems included | Percent |
|---|---|---|---|
| PFOA: 4.05 ppt study benchmark (reproduces EPA classification around 4 ppt) | 8 | 46 | 17.4% |
| PFOS: 4.05 ppt study benchmark (reproduces EPA classification around 4 ppt) | 1 | 46 | 2.2% |
| PFHxS: 15 ppt study benchmark (reproduces EPA classification around 10 ppt) | 0 | 46 | 0.0% |
| PFNA: 15 ppt study benchmark (reproduces EPA classification around 10 ppt) | 0 | 46 | 0.0% |
| HFPO-DA: 15 ppt study benchmark (reproduces EPA classification around 10 ppt) | 0 | 46 | 0.0% |
| Hazard Index: 1.5 study benchmark with at least two detected components (reproduces EPA classification around 1) | 0 | 46 | 0.0% |
Community water systems with complete monitoring
“Complete monitoring” means at least one sampling location had all required samples needed for a yearly average. Each PWSID appears once, preventing double counting across ZIP associations.
| Public water system | PWSID | Population served | Primary source | Sampling locations | Study benchmark result |
|---|---|---|---|---|---|
| AQUARION WATER/NH | NH1051010 | 34,000 | Ground water | 4 | Below all study benchmarks |
| BERLIN WATER WORKS | NH0231010 | 9,575 | Surface water | 2 | Below all study benchmarks |
| BRISTOL WATER WORKS | NH0301010 | 3,575 | Ground water | 3 | Below all study benchmarks |
| CENTRAL HOOKSETT WATER PCT | NH1181010 | 4,650 | Surface water purchased | 1 | Below all study benchmarks |
| CLAREMONT WATER DEPT | NH0461010 | 9,000 | Surface water | 1 | Below all study benchmarks |
| CONCORD WATER DEPT, NH | NH0501010 | 44,215 | Surface water | 1 | Below all study benchmarks |
| DERRY WATER DEPT | NH0611010 | 17,370 | Surface water purchased | 1 | Below all study benchmarks |
| DOVER WATER DEPT, NH | NH0651010 | 29,000 | Ground water | 5 | Below all study benchmarks |
| EXETER WATER DEPT | NH0801010 | 12,236 | Surface water | 2 | Below all study benchmarks |
| FRANKLIN WATER WORKS | NH0851010 | 7,200 | Ground water | 4 | Below all study benchmarks |
| HAMPSTEAD AREA WATER | NH1031010 | 7,153 | Surface water purchased | 12 | At or above a study benchmark |
| HANOVER WATER DEPT | NH1071010 | 9,600 | Surface water | 1 | Below all study benchmarks |
| HUDSON WATER DEPT | NH1201010 | 16,700 | Ground water | 1 | At or above a study benchmark |
| JAFFREY WATER WORKS | NH1221010 | 3,800 | Ground water | 4 | At or above a study benchmark |
| KEENE WATER DEPT | NH1241010 | 30,000 | Surface water | 3 | Below all study benchmarks |
| LACONIA WATER WORKS | NH1281010 | 17,125 | Surface water | 1 | Below all study benchmarks |
| LEBANON WATER DEPT | NH1321010 | 13,600 | Surface water | 1 | Below all study benchmarks |
| LITTLE POND ESTATES | NH0192080 | 3,000 | Surface water purchased | 1 | Below all study benchmarks |
| LOWER BARTLETT WATER PCT | NH0161020 | 3,850 | Ground water | 2 | Below all study benchmarks |
| MANCHESTER WATER WORKS, NH | NH1471010 | 123,500 | Surface water | 1 | At or above a study benchmark |
| MERRIMACK VILLAGE DIST | NH1531010 | 25,500 | Ground water | 3 | Below all study benchmarks |
| MILFORD WATER UTILITIES DEPT | NH1561010 | 9,500 | Surface water purchased | 2 | Below all study benchmarks |
| NEW LONDON SPRINGFIELD WATER | NH1721010 | 3,250 | Ground water | 1 | Below all study benchmarks |
| NEWMARKET WATER WORKS | NH1731010 | 5,030 | Ground water | 2 | Below all study benchmarks |
| NEWPORT WATER WORKS | NH1741010 | 5,000 | Surface water | 2 | Below all study benchmarks |
| NORTH CONWAY WATER PCT | NH0511030 | 5,500 | Ground water | 5 | Below all study benchmarks |
| PEMBROKE WATER WORKS | NH1861010 | 5,200 | Ground water | 4 | Below all study benchmarks |
| PENACOOK BOSCAWEN WATER PCT | NH0251010 | 3,800 | Ground water | 3 | Below all study benchmarks |
| PENNICHUCK WATER WORKS | NH1621010 | 88,853 | Surface water | 1 | Below all study benchmarks |
| PETERBOROUGH WATER WORKS | NH1871010 | 4,500 | Ground water | 3 | Below all study benchmarks |
| PEU/LITCHFIELD | NH1371010 | 6,920 | Surface water purchased | 2 | At or above a study benchmark |
| PEU/LONDONDERRY | NH1391010 | 6,255 | Surface water purchased | 1 | At or above a study benchmark |
| PLYMOUTH VLG WATER AND SEWER | NH1941010 | 6,700 | Ground water | 2 | Below all study benchmarks |
| PORTSMOUTH WATER WORKS | NH1951010 | 33,000 | Surface water | 8 | At or above a study benchmark |
| PWW/FARLEY RD ESTATES | NH1622010 | 85 | Ground water | 1 | Below all study benchmarks |
| RAYMOND WATER DEPT | NH1971010 | 3,300 | Ground water | 3 | Below all study benchmarks |
| RIVER RUN CONDOS | NH0162170 | 750 | Ground water | 1 | Below all study benchmarks |
| ROCHESTER WATER DEPT | NH2001010 | 25,000 | Surface water | 2 | Below all study benchmarks |
| SACO RIVER FOREST | NH0512120 | 63 | Ground water | 1 | Below all study benchmarks |
| SALEM WATER DEPT | NH2051010 | 21,000 | Surface water | 2 | At or above a study benchmark |
| SEABROOK WATER DEPT | NH2111010 | 14,000 | Ground water | 4 | Below all study benchmarks |
| SOMERSWORTH WATER WORKS | NH2151010 | 12,200 | Surface water | 1 | Below all study benchmarks |
| UNH/DURHAM WATER SYS | NH0691010 | 16,000 | Surface water | 2 | Below all study benchmarks |
| VILLAGE DIST OF EASTMAN | NH0951010 | 3,400 | Ground water | 1 | Below all study benchmarks |
| VILLAGE DISTRICT OF EIDELWEISS | NH1461010 | 1,200 | Ground water | 2 | Below all study benchmarks |
| WOLFEBORO WATER AND SEWER | NH2561010 | 6,000 | Surface water | 1 | Below all study benchmarks |
What is included
Each active community water system with enough required samples for a yearly average is counted once, even if it is linked with several ZIP codes. This does not mean every home was tested. Private wells are excluded, and UCMR 5 did not comprehensively monitor every small system. This page does not apply New Hampshire's state-specific standards or determine compliance. Use the official state or territory drinking-water program for current regulatory information.