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The Philadelphia Water Department (PWD) studied the effects of residential plumbing onvarious water quality parameters: temperature; chlorine residual; ammonia; pH; heterotrophicplate count; total organic carbon; and, disinfection byproducts (TTHM and HAA5). Volunteersfrom throughout Philadelphia sampled their homes' cold and hot waters. For two seasons,significant changes were seen in many of the parameters between cold and hot waters, including: chlorineresidual decreased; ammonia residual increased; pH was largely unchanged; HPC counts varied;TOC was unchanged; TTHM increased; and, HAA5 increased. It seemed that the magnitude ofthe change between hot and cold water temperature may be an indication of the change in waterquality. The changes were somewhat unique by household, and this raises the question of certainconsumers being more impacted by water quality changes that are not otherwise indicated bycurrent monitoring programs. Recommendations are made for researchers on conducting more effectivesurveys of water quality changes in premise plumbing as more research is pursued on this topic. Includes 8 references, tables, figures.

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Edition: Vol. - No. Published: 11/01/2008 Number of Pages: 15File Size: 1 file , 760 KB