For about 50 years, the predecessors of respondent Union Gas Co. operated a coal gasification plant near Brodhead Creek in Stroudsburg, Pennsylvania, which produced coal tar as a by-product.
The plant was dismantled around 1950. A few years later, Pennsylvania took part in major flood-control efforts along the creek.
In 1980, shortly after acquiring easements to the property along the creek, the Commonwealth struck a large deposit of coal tar while excavating the creek. The coal tar began to seep into the creek, and the Environmental Protection Agency determined that the tar was a hazardous substance and declared the site the Nation's first emergency Superfund site. Working together, Pennsylvania and the Federal Government cleaned up the area, and the Federal Government reimbursed the State for clean-up costs of $720,000.
To recoup these costs, the United States sued Union Gas under §§ 104 and 106 of CERCLA, claiming that Union Gas was liable for such costs because the company and its predecessors had deposited coal tar into the ground near Brodhead Creek. Union Gas filed a third-party complaint against Pennsylvania, asserting that the Commonwealth was responsible for at least a portion of the costs because it was an owner or operator of the hazardous-waste site. Its flood-control efforts had negligently caused or contributed to the release of the coal tar into the creek. The District Court dismissed the complaint, accepting Pennsylvania's claim that its Eleventh Amendment immunity barred the suit. A divided panel of the Court of Appeals for the Third Circuit affirmed, finding no clear expression of congressional intent to hold States liable in monetary damages under CERCLA.
While Union Gas' petition for certiorari was pending, Congress amended CERCLA by passing SARA. The Supreme Court granted certiorari, vacated the Court of Appeals' opinion, and remanded for reconsideration in light of these amendments. On remand, the Court of Appeals held that the language of CERCLA, as amended, clearly rendered States liable for monetary damages and that Congress had the power to do so when legislating pursuant to the Commerce Clause. The Supreme Court granted certiorari, 485 U. S. 958 (1988), and affirmed.
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