An illicit discharge is defined in the federal regulations as:
...any discharge to an Municipal Separate Storm Sewer Systems (MS4) that is not composed entirely of storm water..."
There are two modes of entry: direct and indirect.
Direct: Flows in the storm drains created by illicit/improper connections between sanitary sewer and storm drain system
Indirect: Flows in the storm drains created by pollutants that enter the storm drain system through an inlet or through the joints of the pipe (infiltration)
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