From The Naitional Law Review:
On June 26, the US Supreme Court denied New Mexico’s petition seeking to institute an original action against Colorado for the 2015 Gold King Mine spill. An original action in the US Supreme Court is a lawsuit between states. Invoking that rarely used procedure, New Mexico sought to hold Colorado liable for the Gold King Mine spill. New Mexico asserted claims under the intricate provisions of the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA) and the Resource Conservation and Recovery Act of 1976 (RCRA). New Mexico also sought analogous relief against Colorado under federal interstate common law.
Attorneys assisting the State of Colorado, successfully argued that the US Supreme Court should not entertain New Mexico’s novel lawsuit. As explained in Colorado’s briefing, New Mexico’s RCRA claim failed because a CERCLA response action had been initiated to address the relevant hazardous substance release. New Mexico’s CERCLA claim failed, Colorado argued, for a number of reasons, including that once a site is under investigation under CERCLA authority, several of New Mexico’s claims are barred because they would interfere with the CERCLA investigation and remedy decision making. Colorado additionally argued that Congress displaced New Mexico’s putative federal common law claims through its enactment of comprehensive environmental statutes, most importantly the Clean Water Act, but also CERCLA and RCRA. Finally, Colorado’s briefing also explained that Colorado should not be held liable for its regulatory activities in remediating and managing abandoned mines…
Colorado’s victory at the US Supreme Court protects Congress’s carefully constructed statutory scheme for the effective management and remediation of water pollution across the country. It also protects Colorado’s sovereign ability to remediate abandoned mines.