13 cities covered
New Hampshire water quality, by city
2 of 13 covered New Hampshire cities use chloramine in at least part of the system, and 0 have hard water. 1 of New Hampshire's 10 counties are EPA radon zone 1.
New Hampshire cities of 10,000+
| City | Disinfectant | Hardness | Lead | PFAS | Radon |
|---|---|---|---|---|---|
| Manchester | Chloramine | 0.9 gpg | Not detected | PFOA | Moderate |
| Nashua | Chlorine | 1.8 gpg | Not detected | Not detected | Moderate |
| Concord | Chloramine | No data | 1 ppb | Not detected | Moderate |
| Dover | Chlorine | 3.8 gpg | 1 ppb | Not detected | Moderate |
| Rochester | Chlorine | No data | 2 ppb | Not detected | Moderate |
| Keene | Chlorine | 3.3 gpg | Not detected | Not detected | Moderate |
| Portsmouth | Chlorine | 2.6 gpg | Not detected | PFOA, PFOS | Moderate |
| Laconia | Chlorine | No data | 4 ppb | Not detected | Moderate |
| Lebanon | Chlorine | 1.3 gpg | Not detected | Not detected | Moderate |
| Claremont | Chlorine | No data | 2 ppb | Not detected | Moderate |
| Somersworth | Chlorine | No data | Not detected | Not detected | Moderate |
Smaller New Hampshire towns
2 more covered towns, each with its own page.
What the data shows across New Hampshire
Chlorine or chloramine
2 of 13 covered cities use chloramine in at least part of the system: Manchester and Concord. Most cheap shower filters barely affect chloramine; look for vitamin C or catalytic carbon media.
Shower filters that handle chloramineHardness
0 of 6 cities with a hardness reading have hard or very hard water. Readings run from 0.9 grains per gallon in Manchester (soft) to 3.8 in Dover (moderately hard).
Softener or filter?Lead
No covered New Hampshire city's utility reported a 90th-percentile lead result of 5 ppb or more. Lead comes from service lines and plumbing, so older homes should still test.
PFAS
EPA's nationwide sampling found PFAS above a 2024 EPA limit, in at least one sample, in the water serving Manchester and Portsmouth.