Above ground storage tanks (ASTs) are tanks that are used to store petroleum products, hazardous waste, or other hazardous material above ground.

ASTs in Idaho are regulated by the U.S. Environmental Protection Agency (EPA), under the federal Spill Prevention, Control, and Countermeasure (SPCC) rule. Although DEQ does not regulate ASTs in Idaho, state rules require that the agency be notified within 24 hours of the time of release if an AST has a release to the environment. Local fire districts, cities, and counties may have additional AST ordinances or best management practices.