Amends the Petroleum Underground Storage Tanks Title of the Environmental Protection Act. Provides that a municipality or county may, to the same extent as an owner or operator, conduct tank removal, abandonment, site investigation, and corrective action with respect to a petroleum orphan underground storage tank in accordance with the requirements of the Leaking Underground Storage Tank Program, except that a municipality or county does not have to elect to proceed as an owner and the costs shall be eligible for payment from the Underground Storage Tank Fund. Defines "orphan underground storage tank". Makes conforming and other changes in provisions regarding the Underground Storage Tank Fund.