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Illicit Discharge Program

CDOT seeks to detect and eliminate all illegal discharges. An illegal discharge, often called an illicit discharge, is a discharge to CDOT's storm drain system that could cause pollution. Common pollutants include oil and grease, fertilizers and pesticides, grass clippings and leaves, and any substances that have a "funny" smell or color. CDOT has also developed wallet and visor cards for CDOT employees. The Illicit Discharges Program brochure provides more information.
File PDF document Illicit Discharges Program Brochure
File PDF document IDDE Visor Card
File PDF document IDDE Wallet Card
2009 IDDE Manual
File PDF document Illicit Discharge Program Implementation Schedule 2017-2018

Report an Illegal Discharge

  • Hotline: 303-512-4H2O
    (303-512-4426)

Illegal discharges (aka, illicit discharges) emit into CDOT's storm drain system pollutants (e.g., oil, grease, fertilizers, pesticides, grass clippings, leaves, or odd smelling/colored substances).

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