PFHxS in New Hampshire well water
In New Hampshire, <1% of 6,095 tested private well samples exceeded the EPA limit for PFHxS (10 ng/L).
PFHxS comes mainly from firefighting foam and persists in the body longer than most PFAS. It is linked to thyroid and immune effects. Wells near airports, fire stations and training grounds are most at risk.
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 | 3,793 | 82% | <1% | 0.79 | 170 ng/L |
| Strafford | 157 | 57% | <1% | 0.21 | 11 ng/L |
| Rockingham | 2,122 | 81% | <1% | 0.87 | 140 ng/L |
- Litchfield, Hillsborough County4% of 473
- North Hampton, Rockingham County2% of 43
- Hudson, Hillsborough County2% of 46
- Exeter, Rockingham County2% of 65
- Greenland, Rockingham County1% of 150
- Madbury, Strafford County1% of 88
- Merrimack, Hillsborough County<1% of 204
- Londonderry, Rockingham County<1% of 1,523
- Stratham, Rockingham County<1% of 276
- Bedford, Hillsborough County<1% of 3,053
- 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. PFHxS counts and shares are listed on each county and town page with their sources.