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Why are dye test / lateral inspection required?

Act 537 of the Pennsylvania Department of Environmental Protection (DEP) requires local governments to adopt a corrective action plan to control overloading of the sanitary sewer system and one of the requirements is to remove stormwater from these types of sewer lines. This storm water and ground water entering the system inappropriately is referred to as Inflow and Infiltration (I&I).

See attached document for more information.