What is an illicit discharge?

An illicit discharge is any discharge to a municipal separate storm sewer (MS4) that is not comprised entirely of stormwater or of authorized non-stormwater discharges permitted under an NPDES permit.  Some non-stormwater discharges may be allowable, such as flows from fire fighting activities and air conditioning condensate.  Outdoor washing acitivites that flow to a storm drain inlet may be considered an illicit discharge if the water becomes contaminated with roadway pollutants as it flows across driveways and along curb/gutter.  

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1. Are the CDID #1 ditches waters of the U.S.?
2. What is an illicit discharge?
3. Are non-stormwater discharges allowed?
4. Can I drain my swimming pool or hot tub to the ditch?
5. What do I need to know before starting construction?