Illinois v. City of Milwaukee

Background

Illinois asked the Supreme Court for permission to file an original lawsuit against four Wisconsin cities and two Milwaukee-area sewerage commissions. Illinois says the defendants discharge about 200 million gallons daily of raw or poorly treated sewage and other wastes into Lake Michigan. Illinois and some of its local governments prohibit such discharges and want the Court to order the pollution stopped as a public nuisance.

Reasoning

The Court explained it uses its original power over disputes between States sparingly. It said municipal bodies are not automatically the same as a State for forcing Supreme Court original jurisdiction, and that cases against local public entities can often be heard in federal district court. The Court also held that pollution of interstate waters is a matter for federal law: federal common law can create the legal rules needed, and a State may bring such claims in federal court under the federal civil‑case statute. Although Congress has passed water pollution laws and agencies have rules, those statutes do not displace the federal courts’ ability to fashion remedies for interstate nuisance.

Real world impact

The Supreme Court denied Illinois leave to sue in the Supreme Court and sent the parties to an appropriate federal district court. That means Illinois must pursue its request for injunctions there. The decision confirms federal district courts can hear interstate water pollution suits and that municipalities and sewerage commissions can be subject to court orders to stop nuisances. This ruling is procedural and does not resolve the underlying facts or final legal outcome.