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==Background==
Early [[combined sewer]]s used [[surface runoff]] to dilute waste from [[toilet]]s and carry it away from urban areas into natural waterways. [[Sewage treatment]] can remove some [[pollutant]]s from toilet waste, but treatment becomes inefficient when the waste is diluted in combined sewers. Modern sanitary sewers are designed to transport domestic and industrial [[wastewater]] directly to treatment facilities without dilution.<ref name="steel">Steel, E.W. and
==Infiltration==
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