Relationship of Federal Common Law and Federal Regulatory Statutes, City of Milwaukee v. Illinois and Michigan

In City of Milwaukee v. Illinois and Michigan, the United States Supreme Court vacated the judgment of the court of appeals and remanded the case, holding that the Federal Water Pollution Control Act Amendments of 1972 had indeed displaced the federal common law action authorized by the Court before the 1972 Amendments were enacted. The environmental law ramifications of this decision are significant. However, of greater significance is the Court's attempt in Milwaukee to efface some of the uncertainty surrounding the federal common law, and to elucidate the relationship between federal regulatory statutes and federal common law.