All 49 systems met the sampling requirement for a yearly average. Of those systems, 9 had at least one yearly average above an EPA comparison level and 40 did not.
EPA-based study benchmark: a fixed, unrounded research cutoff used to reproduce EPA’s final UCMR 5 technical-assistance classification based on the April 2024 federal levels. It is not a current federal or state standard. The label does not determine compliance, household exposure, or health risk.
State rules: The labels on this page use fixed research cutoffs based on the April 2024 federal levels. New Hampshire may use different current standards or guidance. These UCMR 5 results do not determine current federal or state compliance. Find the official New Hampshire drinking-water program →
Find your water system
A ZIP code finds possible public water systems for an area; it cannot identify the supplier for a specific home. Confirm the 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 above the named EPA comparison level.
| EPA rounding cutoff | Systems above comparison level | Water systems included | Percent |
|---|---|---|---|
| PFOA: 4 ppt level; unrounded average ≥4.05 ppt after applying EPA rounding | 9 | 49 | 18.4% |
| PFOS: 4 ppt level; unrounded average ≥4.05 ppt after applying EPA rounding | 2 | 49 | 4.1% |
| PFHxS: 10 ppt level; unrounded average ≥15 ppt after applying EPA rounding | 0 | 49 | 0.0% |
| PFNA: 10 ppt level; unrounded average ≥15 ppt after applying EPA rounding | 0 | 49 | 0.0% |
| HFPO-DA: 10 ppt level; unrounded average ≥15 ppt after applying EPA rounding | 0 | 49 | 0.0% |
| Hazard Index: 1 level; unrounded index ≥1.5 and at least two detected components | 0 | 49 | 0.0% |
Community water systems with complete monitoring
“Complete monitoring” means at least one sampling location had every required sample needed to calculate a yearly average. It does not mean every location or home was tested. Each PWSID appears once, preventing double counting across ZIP associations.
| Public water system | PWSID | Population served | Primary source | Sampling locations | EPA comparison result |
|---|---|---|---|---|---|
| AQUARION WATER/NH | NH1051010 | 34,000 | Ground water | 4 | No available average above comparison levels |
| BERLIN WATER WORKS | NH0231010 | 9,575 | Surface water | 2 | No available average above comparison levels |
| BRISTOL WATER WORKS | NH0301010 | 3,575 | Ground water | 3 | No available average above comparison levels |
| CENTRAL HOOKSETT WATER PCT | NH1181010 | 4,650 | Surface water purchased | 1 | No available average above comparison levels |
| CLAREMONT WATER DEPT | NH0461010 | 9,000 | Surface water | 1 | No available average above comparison levels |
| CONCORD WATER DEPT, NH | NH0501010 | 44,215 | Surface water | 1 | No available average above comparison levels |
| DERRY WATER DEPT | NH0611010 | 17,370 | Surface water purchased | 1 | No available average above comparison levels |
| DOVER WATER DEPT, NH | NH0651010 | 29,000 | Ground water | 5 | No available average above comparison levels |
| EXETER WATER DEPT | NH0801010 | 12,236 | Surface water | 2 | No available average above comparison levels |
| FRANKLIN WATER WORKS | NH0851010 | 7,200 | Ground water | 4 | No available average above comparison levels |
| HAMPSTEAD AREA WATER | NH1031010 | 7,153 | Surface water purchased | 12 | Above an EPA comparison level |
| HANOVER WATER DEPT | NH1071010 | 9,600 | Surface water | 1 | No available average above comparison levels |
| HUDSON WATER DEPT | NH1201010 | 16,700 | Ground water | 1 | Above an EPA comparison level |
| JAFFREY WATER WORKS | NH1221010 | 3,800 | Ground water | 4 | Above an EPA comparison level |
| KEENE WATER DEPT | NH1241010 | 30,000 | Surface water | 3 | No available average above comparison levels |
| LACONIA WATER WORKS | NH1281010 | 17,125 | Surface water | 1 | No available average above comparison levels |
| LEBANON WATER DEPT | NH1321010 | 13,600 | Surface water | 1 | No available average above comparison levels |
| LITTLE POND ESTATES | NH0192080 | 3,000 | Surface water purchased | 1 | No available average above comparison levels |
| LITTLETON WATER AND LIGHT DEPT | NH1381010 | 6,500 | Surface water | 1 | No available average above comparison levels |
| LOWER BARTLETT WATER PCT | NH0161020 | 3,850 | Ground water | 2 | No available average above comparison levels |
| MANCHESTER WATER WORKS, NH | NH1471010 | 123,500 | Surface water | 1 | Above an EPA comparison level |
| MERRIMACK VILLAGE DIST | NH1531010 | 25,500 | Ground water | 3 | No available average above comparison levels |
| MILFORD WATER UTILITIES DEPT | NH1561010 | 9,500 | Surface water purchased | 2 | No available average above comparison levels |
| NEW LONDON SPRINGFIELD WATER | NH1721010 | 3,250 | Ground water | 1 | No available average above comparison levels |
| NEWMARKET WATER WORKS | NH1731010 | 5,030 | Ground water | 2 | No available average above comparison levels |
| NEWPORT WATER WORKS | NH1741010 | 5,000 | Surface water | 2 | No available average above comparison levels |
| NORTH CONWAY WATER PCT | NH0511030 | 5,500 | Ground water | 5 | No available average above comparison levels |
| PEASE TRADE PORT | NH1951020 | 9,900 | Ground water | 1 | No available average above comparison levels |
| PEMBROKE WATER WORKS | NH1861010 | 5,200 | Ground water | 4 | No available average above comparison levels |
| PENACOOK BOSCAWEN WATER PCT | NH0251010 | 3,800 | Ground water | 3 | No available average above comparison levels |
| PENNICHUCK WATER WORKS | NH1621010 | 88,853 | Surface water | 1 | No available average above comparison levels |
| PETERBOROUGH WATER WORKS | NH1871010 | 4,500 | Ground water | 3 | No available average above comparison levels |
| PEU/LITCHFIELD | NH1371010 | 6,920 | Surface water purchased | 2 | Above an EPA comparison level |
| PEU/LONDONDERRY | NH1391010 | 6,255 | Surface water purchased | 1 | Above an EPA comparison level |
| PLYMOUTH VLG WATER AND SEWER | NH1941010 | 6,700 | Ground water | 2 | No available average above comparison levels |
| PORTSMOUTH WATER WORKS | NH1951010 | 33,000 | Surface water | 8 | Above an EPA comparison level |
| PWW/FARLEY RD ESTATES | NH1622010 | 85 | Ground water | 1 | No available average above comparison levels |
| RAYMOND WATER DEPT | NH1971010 | 3,300 | Ground water | 3 | No available average above comparison levels |
| RIVER RUN CONDOS | NH0162170 | 750 | Ground water | 1 | No available average above comparison levels |
| ROCHESTER WATER DEPT | NH2001010 | 25,000 | Surface water | 2 | No available average above comparison levels |
| RYE WATER DIST | NH2041010 | 4,300 | Ground water | 1 | Above an EPA comparison level |
| SACO RIVER FOREST | NH0512120 | 63 | Ground water | 1 | No available average above comparison levels |
| SALEM WATER DEPT | NH2051010 | 21,000 | Surface water | 2 | Above an EPA comparison level |
| SEABROOK WATER DEPT | NH2111010 | 14,000 | Ground water | 4 | No available average above comparison levels |
| SOMERSWORTH WATER WORKS | NH2151010 | 12,200 | Surface water | 1 | No available average above comparison levels |
| UNH/DURHAM WATER SYS | NH0691010 | 16,000 | Surface water | 2 | No available average above comparison levels |
| VILLAGE DIST OF EASTMAN | NH0951010 | 3,400 | Ground water | 1 | No available average above comparison levels |
| VILLAGE DISTRICT OF EIDELWEISS | NH1461010 | 1,200 | Ground water | 2 | No available average above comparison levels |
| WOLFEBORO WATER AND SEWER | NH2561010 | 6,000 | Surface water | 1 | No available average above comparison levels |
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. Private wells are excluded, and UCMR 5 did not comprehensively monitor every small system.