To require any department, agency, or instrumentality that is responsible for a release of hazardous substances at a Superfund site to promptly pay for the costs and damages associated with such release, and to provide that other potentially responsible parties may not be required to pay such costs until the department, agency, or instrumentality has made its payment.

Provides that in any case in which a Federal agency is found to be liable under the Comprehensive Environmental Response, Compensation, and Liability Act for a release or threatened release of a hazardous substance at a federally-owned site: (1) the agency shall pay the costs and damages with respect to such site; and (2) no potentially responsible party may be required to pay costs or damages until the agency has paid.