Natural gas storage is important for ensuring that natural gas is available when demand increases. There are 415 storage sites—including underground caverns and depleted aquifers and oil and gas reservoirs—located in 31 states, often near population centers (see fig.). Leaks from these sites, such as one near Los Angeles that led to the temporary relocation of about 8,000 families in 2015, can result in environmental and economic damage. Until 2016, states set standards for 211 sites, but there were no standards for 204 sites connected to interstate pipelines subject to federal jurisdiction. With passage of the PIPES Act of 2016, PHMSA, an agency within DOT that sets and enforces standards for energy pipelines, among other things, was tasked with issuing minimum standards for all gas storage sites...