State file — MD
Underground storage tanks in Maryland
12,656 registered facilities · 7,203 tanks in service · 12,329 leak records · 79 open cleanup cases (EPA UST Finder snapshot, 2018–2021 state data).
Maryland runs 11.8 tanks in service per 10,000 residents (population 6,104,335). 12,250 of its 12,329 reported releases have reached No Further Action. The regulator of record is the MDE Oil Control Program, which holds the live registration and case files.
Check any Maryland 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 |
|---|---|---|---|---|
| Allegany County | 318 | 125 | 129 | 0 |
| Anne Arundel County | 1,144 | 749 | 1,489 | 8 |
| Baltimore City County | 1,355 | 587 | 1,209 | 10 |
| Baltimore County County | 1,433 | 822 | 1,222 | 17 |
| Calvert County | 202 | 145 | 181 | 0 |
| Caroline County | 165 | 67 | 94 | 0 |
| Carroll County | 460 | 191 | 233 | 3 |
| Cecil County | 330 | 164 | 317 | 8 |
| Charles County | 329 | 189 | 509 | 1 |
| Dorchester County | 204 | 56 | 237 | 1 |
| Frederick County | 525 | 305 | 306 | 5 |
| Garrett County | 194 | 92 | 133 | 0 |
| Harford County | 559 | 249 | 644 | 6 |
| Howard County | 458 | 285 | 317 | 3 |
| Kent County | 154 | 61 | 145 | 0 |
| Montgomery County | 1,238 | 931 | 1,624 | 6 |
| Prince George's County | 1,437 | 1,182 | 1,688 | 5 |
| Queen Anne's County | 231 | 139 | 205 | 1 |
| Somerset County | 112 | 40 | 104 | 1 |
| St. Mary's County | 297 | 162 | 323 | 0 |
| Talbot County | 251 | 77 | 247 | 1 |
| Washington County | 498 | 271 | 269 | 1 |
| Wicomico County | 470 | 184 | 433 | 1 |
| Worcester County | 292 | 130 | 271 | 1 |
Frequently asked questions
How many underground storage tanks are in Maryland?
The EPA UST Finder snapshot lists 12,656 registered UST facilities in Maryland, with 7,203 tanks in service and 39,871 closed or removed tanks across 24 countys.
How many tank leaks have been reported in Maryland?
12,329 releases are on record statewide. 12,250 (99%) were closed with No Further Action; 79 cleanup cases remained open in the snapshot.
Which Maryland county has the most underground storage tanks?
By facility count: Prince George's (1,437), Baltimore County (1,433), Baltimore City (1,355), Montgomery (1,238), Anne Arundel (1,144). Use the county pages for tank and leak detail, or screen any specific address free at https://tankcheckusa.site/.