Abstract:
Water undergoes substantial changes in quality between the time it leaves the treatment ities, and distribution system; age, type, plant and the time it reaches the customer’s tap, making it important to select monitoring design, and maintenance of the distribustations that will adequately monitor these changes. But because there is no uniform tion network; and quality of treated water.’ schedule or framework for monitoring under the Safe Drinking Water Act, the degree of Another factor, infrequently considered, variability among monitoring requirements poses both management and technical barriers that may influence water quality in a distrito states and water systems ultimately responsible for implementation of the regulations. bution system is the effect of mixing of Systematic and quantitative guidelines are provided here for locating monitoring stations. water from different sources. Water distriBy using the concept of pathways, the authors applied the concept of coverage and inferred bution systems frequently draw water the quality at an upstream node from the quality at a downstream node. from multiple sources, such as a combinaFinished water may undergo substantial the distribution system itself can have a changes in quality between the time it negative effect on water quality. Some inleaves a treatment plant and the time it fluential factors are chemical and biologireaches the consumer. Most of the inter- cal quality of source water; effectiveness est in water quality has focused on finished and efficiencv of treatment nrocesses: inA demo@ration diskette is available from RolfA. Deininger, School of Public Health, University of Michigan, Ann Arbor, MI 48109. Pleasesendaformatted 1.2-m diskette along with a selfaddressed label and water as it leaves-the treatment plant, but tegrity of the-treatment plan{ storage facil- postage.}
