The volume presents the official proceedings of the National Conference on Water Pollution, called at the request of President Eisenhower and held in Washington, D.C., in December 1960. The purpose of the conference was to assess the problem of water pollution, to determine its effects upon the national welfare, and to set realistic goals for its control. In this way the conference would create a national body of opinion and documented fact on which our country may base a new and more vigorous attack on this serious hazard. The theme of the conference was 'Clean Water--A Challenge to the Nation'.