State file — MA
Underground storage tanks in Massachusetts
10,528 registered facilities · 8,321 tanks in service · 5,331 leak records · 419 open cleanup cases (EPA UST Finder snapshot, 2018–2021 state data).
Massachusetts runs 12.1 tanks in service per 10,000 residents (population 6,884,028). 4,912 of its 5,331 reported releases have reached No Further Action. The regulator of record is the MassDEP UST Program, which holds the live registration and case files.
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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 |
|---|---|---|---|---|
| Barnstable County | 475 | 423 | 201 | 16 |
| Berkshire County | 472 | 241 | 181 | 5 |
| Bristol County | 933 | 762 | 429 | 42 |
| Dukes County | 46 | 48 | 18 | 0 |
| Essex County | 1,026 | 852 | 566 | 41 |
| Franklin County | 242 | 106 | 86 | 4 |
| Hampden County | 1,048 | 642 | 407 | 18 |
| Hampshire County | 365 | 198 | 128 | 11 |
| Middlesex County | 1,930 | 1,803 | 1,144 | 99 |
| Nantucket County | 20 | 10 | 6 | 0 |
| Norfolk County | 959 | 826 | 510 | 45 |
| Plymouth County | 811 | 735 | 390 | 37 |
| Suffolk County | 732 | 598 | 494 | 35 |
| Worcester County | 1,469 | 1,077 | 771 | 66 |
Frequently asked questions
How many underground storage tanks are in Massachusetts?
The EPA UST Finder snapshot lists 10,528 registered UST facilities in Massachusetts, with 8,321 tanks in service and 27,787 closed or removed tanks across 14 countys.
How many tank leaks have been reported in Massachusetts?
5,331 releases are on record statewide. 4,912 (92%) were closed with No Further Action; 419 cleanup cases remained open in the snapshot.
Which Massachusetts county has the most underground storage tanks?
By facility count: Middlesex (1,930), Worcester (1,469), Hampden (1,048), Essex (1,026), Norfolk (959). Use the county pages for tank and leak detail, or screen any specific address free at https://tankcheckusa.site/.