Safe drinking water : hearings before the Subcommittee on Public Health and Environment of the Committee on Interstate and Foreign Commerce, House of Representatives, Ninety-second Congress, first session on H.R. 1093 and H.R. 5454, bills to amend the Public Health Service Act to provide the public with an adequate quantity of safe water for drinking, recreation, and other human uses, and for other purposes and H.R. 437, a bill to improve and implement programs to assure that United States residents have adequate quantities of safe drinking water by protecting them from chemical, biological, and physical contaminants in public water systems which may adversely affect their health, May 24, 25, and 26, 1971.