What is an illicit discharge?

The U.S. Environmental Protection Agency (EPA) defines illicit discharges in general as any discharge into a storm drain system that is not composed entirely of stormwater. The exceptions include water from fire fighting activities, discharges from de-chlorinated waterlines, fire hydrant flushing and discharges from facilities already under an National Pollutant Discharge Elimination System (NPDES) Permit.

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1. What is an illicit discharge?
2. Why are illicit discharges a problem?
3. What are examples of illicit discharges?
4. How can I report an illicit discharge?