Why do public water systems flush water mains?
Flushing water mains removes sediments or other contaminants that can accumulate in pipes over time and lead to taste and odor problems. Flushing in dead-end lines can also improve disinfectant residual levels (Guidance Manual for Conducting Sanitary Surveys of Public Water Systems; Surface Water and Ground Water Under the Direct Influence (GWUDI); EPA815-R-99-016, April 1999). In addition to protecting water quality, regular flushing can help reduce corrosive conditions associated with biofilm growth that can often lead to pipeline leaks and breaks (Potential Contamination Due to Cross-Connections and Backflow and the Associated Health Risks, August 13, 2002).
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