The report covers a special session on pollution of the interstate waters of the Potomac River and its tributaries - Washington Metropolitan Area, in the States of Maryland and Virginia, and the District of Columbia. This session was considered so important by the conferees that all waived the customary statutory notice. The purpose of the conference is to review a memorandum of understanding between Fairfax County, Virginia; the Washington Suburban Sanitary Commission, Maryland; and the District of Columbia Department of Sanitary Engineering. The memorandum details the actions that each of these parties will take to abate pollution of the Potomac River.