Cite as: 503 U. S. 91 (1992)
Opinion of the Court
not improperly be called interstate common law," Illinois v. Milwaukee, 406 U. S. 91, 105-106 (1972) (Milwaukee I), however, we remained aware "that new federal laws and new federal regulations may in time pre-empt the field of federal common law of nuisance." Id., at 107.
In Milwaukee v. Illinois, 451 U. S. 304 (1981) (Milwaukee II), we held that the Federal Water Pollution Control Act Amendments of 1972 did just that. In addressing Illinois' claim that Milwaukee's discharges into Lake Michigan constituted a nuisance, we held that the comprehensive regulatory regime created by the 1972 amendments pre-empted Illinois' federal common law remedy. We observed that Congress had addressed many of the problems we had identified in Milwaukee I by providing a downstream State with an opportunity for a hearing before the source State's permitting agency, by requiring the latter to explain its failure to accept any recommendations offered by the downstream State, and by authorizing the EPA, in its discretion, to veto a source State's issuance of any permit if the waters of another State may be affected. Milwaukee II, 451 U. S., at 325-326.
In Milwaukee II, the Court did not address whether the 1972 amendments had supplanted state common law remedies as well as the federal common law remedy. See id., at 310, n. 4. On remand, Illinois argued that § 510 of the Clean Water Act, 33 U. S. C. § 1370, expressly preserved the State's right to adopt and enforce rules that are more stringent than federal standards.5 The Court of Appeals accepted Illinois' reading of § 510, but held that that section did "no more than
5 Section 510 provides in relevant part: "Except as expressly provided in this [Act], nothing in this [Act] shall (1) preclude or deny the right of any State or political subdivision thereof or interstate agency to adopt or enforce (A) any standard or limitation respecting discharges of pollutants, or (B) any requirement respecting control or abatement of pollution [with exceptions]; or (2) be construed as impairing or in any manner affecting any right or jurisdiction of the States with respect to the waters (including boundary waters) of such States." 33 U. S. C. § 1370 (emphasis added).
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