Leaking Underground Storage Tanks (OCC) Oklahoma Corporation Commission 0 50 Miles Regulated Leaking Underground Storage Tanks This map shows the locations locations of leaking underground storage tanks as identified in the Oklahoma Corporation Commission's UST database. The dataset includes all tanks in the OCC UST database that currently or historically have had a reported leaking problem. For more information regarding the UST program visit the OCC Petroleum Storage Tank Division's web site at: ( http://www.occ.state.ok.us/Divisions/PST/pst.htm ) ( 01/28/2011 )