State file — OK
Underground storage tanks in Oklahoma
13,597 registered facilities · 8,137 tanks in service · 4,124 leak records · 351 open cleanup cases (EPA UST Finder snapshot, 2018–2021 state data).
Oklahoma runs 20.2 tanks in service per 10,000 residents (population 4,027,541). 3,762 of its 4,124 reported releases have reached No Further Action. The regulator of record is the Oklahoma Corporation Commission PST Division, which holds the live registration and case files.
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Frequently asked questions
How many underground storage tanks are in Oklahoma?
The EPA UST Finder snapshot lists 13,597 registered UST facilities in Oklahoma, with 8,137 tanks in service and 29,139 closed or removed tanks across 77 countys.
How many tank leaks have been reported in Oklahoma?
4,124 releases are on record statewide. 3,762 (91%) were closed with No Further Action; 351 cleanup cases remained open in the snapshot.
Which Oklahoma county has the most underground storage tanks?
By facility count: Oklahoma (2,241), Tulsa (1,586), Cleveland (427), Comanche (328), Carter (319). Use the county pages for tank and leak detail, or screen any specific address free at https://tankcheckusa.site/.