JUSTICE O'CONNOR, dissenting.
I join Parts I, II, and III of JUSTICE MARSHALL's dissent. They accurately demonstrate that the Court's interpretation of § 301(1) of the Clean Water Act, 33 U.S.C. § 1311(1), is inconsistent with the language of the statute and its legislative history. In my opinion, this alone is sufficient grounds for affirming the judgment of the Court of Appeals. I express no view as to Part IV of the dissent, because I think it is not necessary to the disposition of these cases.