This report contains the papers presented at the International Symposium n Water Supply and Drainage convened on September 28-30, 1976 at the National cademy of Sciences, Washington, D.C. and conducted by the U.S. National ommittee for the International Council for Building Research, Studies and ocumentation (CIB) Counterpart Commission W-62. The meeting provided the pportunity to exchange information and identify general needs and common erspectives of plumbing in on-going research applications and practices n the United States and other countries.