State file — NH
Underground storage tanks in New Hampshire
4,636 registered facilities · 2,695 tanks in service · 2,419 leak records · 594 open cleanup cases (EPA UST Finder snapshot, 2018–2021 state data).
New Hampshire runs 19.8 tanks in service per 10,000 residents (population 1,364,251). 1,825 of its 2,419 reported releases have reached No Further Action. The regulator of record is the NHDES UST Program, which holds the live registration and case files.
Check any New Hampshire address
Free screening of every registered tank and reported leak within a mile of any address.
Screen an addressBy county
| County | Facilities | Tanks in service | Leak records | Open cases |
|---|---|---|---|---|
| Belknap County | 300 | 136 | 157 | 46 |
| Carroll County | 300 | 148 | 142 | 37 |
| Cheshire County | 320 | 179 | 150 | 26 |
| Coos County | 261 | 157 | 98 | 22 |
| Grafton County | 502 | 274 | 254 | 64 |
| Hillsborough County | 1,037 | 605 | 545 | 134 |
| Merrimack County | 558 | 339 | 279 | 73 |
| Rockingham County | 826 | 566 | 495 | 128 |
| Strafford County | 330 | 182 | 191 | 49 |
| Sullivan County | 202 | 109 | 108 | 15 |
Frequently asked questions
How many underground storage tanks are in New Hampshire?
The EPA UST Finder snapshot lists 4,636 registered UST facilities in New Hampshire, with 2,695 tanks in service and 12,656 closed or removed tanks across 10 countys.
How many tank leaks have been reported in New Hampshire?
2,419 releases are on record statewide. 1,825 (75%) were closed with No Further Action; 594 cleanup cases remained open in the snapshot.
Which New Hampshire county has the most underground storage tanks?
By facility count: Hillsborough (1,037), Rockingham (826), Merrimack (558), Grafton (502), Strafford (330). Use the county pages for tank and leak detail, or screen any specific address free at https://tankcheckusa.site/.