State file — DE
Underground storage tanks in Delaware
2,915 registered facilities · 1,180 tanks in service · 4,965 leak records · 111 open cleanup cases (EPA UST Finder snapshot, 2018–2021 state data).
Delaware runs 12.1 tanks in service per 10,000 residents (population 971,403). 4,854 of its 4,965 reported releases have reached No Further Action. The regulator of record is the DNREC Tank Management Section, which holds the live registration and case files.
Check any Delaware 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 |
|---|---|---|---|---|
| Kent County | 589 | 242 | 805 | 17 |
| New Castle County | 1,460 | 616 | 3,072 | 51 |
| Sussex County | 866 | 322 | 1,088 | 43 |
Frequently asked questions
How many underground storage tanks are in Delaware?
The EPA UST Finder snapshot lists 2,915 registered UST facilities in Delaware, with 1,180 tanks in service and 8,164 closed or removed tanks across 3 countys.
How many tank leaks have been reported in Delaware?
4,965 releases are on record statewide. 4,854 (98%) were closed with No Further Action; 111 cleanup cases remained open in the snapshot.
Which Delaware county has the most underground storage tanks?
By facility count: New Castle (1,460), Sussex (866), Kent (589). Use the county pages for tank and leak detail, or screen any specific address free at https://tankcheckusa.site/.