Recent Supreme Court rulings have called into question federal Clean Water Act coverage for certain wetlands and streams. Legislation recently introduced in the House of Representatives would amend the Act to restate and clarify Congress’s intent to regulate the waters of the United States to the fullest extent of its legislative power. The Environmental Law Institute has issued a new white paper that identifies which constitutional powers Congress can rely on to protect the Nation’s waters, and explains in straightforward language what the Supreme Court has said about these powers.