To amend the Solid Waste Disposal Act to enable Indian tribes to enforce provisions of the Act relating to leaking underground storage tanks on Indian lands, and for other purposes.

Amends the Solid Waste Disposal Act to authorize the Administrator of the Environmental Protection Agency to: (1) delegate primary enforcement authority for programs under such Act to qualifying Indian tribes; (2) provide grant and contract assistance to, and enter into cooperative agreements with, tribes to carry out such Act.

Directs the Administrator to: (1) study and inventory all underground storage tanks within Indian country; and (2) establish a Tribal Leaking Underground Storage Tank Trust Fund.

Obligates specified funds for regulation of such underground storage tanks.

Amends the Internal Revenue Code to reserve at least three percent of the amounts made available to States from the Leaking Underground Storage Tank Trust Fund for the Tribal Leaking Underground Storage Tank Trust Fund.