State file — CT
Underground storage tanks in Connecticut
9,356 registered facilities · 5,192 tanks in service · 2,273 leak records · 874 open cleanup cases (EPA UST Finder snapshot, 2018–2021 state data).
Connecticut runs 14.2 tanks in service per 10,000 residents (population 3,648,725). 1,397 of its 2,273 reported releases have reached No Further Action. The regulator of record is the CT DEEP UST Program, which holds the live registration and case files.
Check any Connecticut 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 |
|---|---|---|---|---|
| Fairfield County | 1,846 | 1,203 | 560 | 199 |
| Hartford County | 2,508 | 1,288 | 623 | 246 |
| Litchfield County | 752 | 311 | 141 | 61 |
| Middlesex County | 474 | 277 | 117 | 42 |
| New Haven County | 2,192 | 1,234 | 459 | 169 |
| New London County | 825 | 503 | 202 | 79 |
| Tolland County | 385 | 204 | 97 | 43 |
| Windham County | 374 | 172 | 74 | 35 |
Frequently asked questions
How many underground storage tanks are in Connecticut?
The EPA UST Finder snapshot lists 9,356 registered UST facilities in Connecticut, with 5,192 tanks in service and 30,508 closed or removed tanks across 8 countys.
How many tank leaks have been reported in Connecticut?
2,273 releases are on record statewide. 1,397 (61%) were closed with No Further Action; 874 cleanup cases remained open in the snapshot.
Which Connecticut county has the most underground storage tanks?
By facility count: Hartford (2,508), New Haven (2,192), Fairfield (1,846), New London (825), Litchfield (752). Use the county pages for tank and leak detail, or screen any specific address free at https://tankcheckusa.site/.