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The Mercer Island sewer utility is made up 104 miles of collection lines which serve over 7,200 customers. The collection system is linked to 17 pump stations, 2 flushing stations, and more than 113 miles of gravity and pressure pipelines, ranging in diameter from 3 to 24 inches which ultimately flow into King County Department of Natural Resources (KCDNR) facilities for treatment and disposal at the South Treatment Plant in Renton.