What is an illicit discharge?

An illicit discharge is any discharge to a stormwater conveyance system (e.g., curb and gutter, street, swale, ditch, creek) that is not entirely composed of stormwater. Stormwater is defined as surface runoff free of pollutants to the maximum extent practicable.

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1. What is an illicit discharge?
2. What is meant by "maximum extent practicable"?
3. Do I need to prepare a Stormwater Pollution Prevention Plan (SWPPP)?
4. Does the SWRCB review and approve SWPPPs?