PFNA in New Hampshire well water
In New Hampshire, <1% of 5,919 tested private well samples exceeded the EPA limit for PFNA (10 ng/L).
PFNA is a long-chain forever chemical found near industrial sites and firefighting foam. It is linked to immune and developmental effects and high cholesterol. New Hampshire set its own limit in 2019.
By county, from individual samples
Public monitoring samples against the EPA limit (10 ng/L); counties with at least 30 samples.
| County | Samples | Detected | Above EPA limit | Median | Highest |
|---|---|---|---|---|---|
| Hillsborough | 3,644 | 22% | <1% | 0 | 25 ng/L |
| Rockingham | 2,095 | 23% | 0% | 0 | 6.1 ng/L |
| Strafford | 157 | 6% | 0% | 0 | 1.5 ng/L |
- Bedford, Hillsborough County<1% of 2,937
- Hudson, Hillsborough County0% of 46
- Londonderry, Rockingham County0% of 1,496
- Litchfield, Hillsborough County0% of 451
- North Hampton, Rockingham County0% of 43
- Merrimack, Hillsborough County0% of 194
- Exeter, Rockingham County0% of 65
- Madbury, Strafford County0% of 88
- Greenland, Rockingham County0% of 150
- Stratham, Rockingham County0% of 276
- Hampton, Rockingham County0% of 39
- Dover, Strafford County0% of 63
Sources
- Individual samples from the USGS Water Quality Portal and state monitoring, summarized per geography. PFNA counts and shares are listed on each county and town page with their sources.