AWWA JAW34249

The residential water audit program conducted by the Contra Costa Water District of Concord, California, in the summer of 1989 was evaluated to determine savings as average gallons per day per account (gpd/account) by three estimation procedures: the constructed comparison group, direct estimation, and statistical modeling. The 1989 residential audit program was estimated to have yielded average savings of about 30 gpd/account (or 6 percent) from September 1989 through August 1990, resulting in aggregate savings of about 10 mil. gal. These estimates are similar to those obtained from the residential audit program conducted in Concord in 1988 and from evaluation of similar audits conducted in Pasadena and Novato, California. A number of recommendations were made on the basis of audit findings. Includes 18 references, tables, figure.