Lead pipes by county in New Hampshire
Lead, galvanized and unknown service lines reported by the water systems serving each New Hampshire county.
| County | Lead | Galv. | Unknown | Systems |
|---|---|---|---|---|
| Belknap County | 0 | 65 | 4,359 | 43 |
| Carroll County | 0 | 26 | 7,970 | 63 |
| Cheshire County | 1 | 96 | 4,678 | 23 |
| Coos County | 0 | 131 | 4,931 | 17 |
| Grafton County | 10 | 178 | 10,993 | 55 |
| Hillsborough County | 0 | 909 | 31,841 | 35 |
| Merrimack County | 0 | 169 | 11,181 | 45 |
| Rockingham County | 0 | 194 | 25,678 | 88 |
| Strafford County | 2 | 283 | 13,913 | 26 |
| Sullivan County | 220 | 34 | 6,291 | 9 |
Systems serving several counties are counted in each. Source: EPA SDWIS service line inventory, 2026 Q3.