On July 15, 2015, the U.S. Environmental Protection Agency (EPA) published a final rule significantly revising the federal regulations pertaining to underground storage tanks (USTs), which became effective October 13, 2015. Some of the changes were made to align with the requirements for USTs made pursuant to the 2005 Energy Policy Act. These updated UST regulations include specific requirements for proper operation and maintenance of UST systems, including spill and overfill prevention equipment and release detection equipment. Overall, the new rule imposes significant new requirements on UST owners and operators, as summarized below.