33 U.S.C. § 567a: Flood and pollution control compacts between certain States

The consent of the Congress of the United States is given to the States of Maine, New York, New Hampshire, Vermont, Massachusetts, Rhode Island, Connecticut, Pennsylvania, West Virginia, Kentucky, Indiana, Illinois, Tennessee, and Ohio, or any two or more of them, to negotiate and enter into agreements or compacts for conserving and regulating the flow, lessening flood damage, removing sources of pollution of the waters thereof, or making other public improvements on any rivers or streams whose drainage basins lie within any two or more of the said States. No such compact or agreement shall be binding or obligatory upon any State a party thereto unless and until it has been approved by the legislatures of each of the States whose assent is contemplated by the terms of the compact or agreement and by the Congress.