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Inflow is water other than sanitary wastewater that enters a sewer system from sources such as roof leaders, cellar / foundation drains, yard drains, area drains, drains from springs and swampy areas, maintenance hole covers, cross connections between storm sewers and sanitary sewers, and catch basins.
Infiltration is water other than sanitary wastewater that enters a sewer system from the ground through defective pipes, pipe joints, connections or maintenance holes.
There are a number of problems caused by inflow and infiltration, including:
We all have an important role to play in reducing the impacts of inflow and infiltration on our sanitary system. Look out for these common sources at home: