Illicit Discharge Detection and Elimination

What is an Illicit Discharge?

An illicit discharge can be from a variety of sources, including:

  • Soil, grass, leaves, mulch, excess fertilizer, and other yard wastes
  • Soaps, detergents, solvents, paint, concrete and grease
  • Motor Oil, antifreeze, and other auto care items

These materials seem harmless, but they have the potential to contaminate our streams and rivers. Illicit contaminants can also be harmful to people, wildlife, and plants adversely effecting our waterways. The KPDES permit does have a list of exempt non-stormwater discharges which have been determined to not be substantial contributors of pollution:

  • Water line flushing and landscape irrigation
  • Diverted stream flows and uncontaminated groundwater infiltration and pumping
  • Air conditioner condensate
  • Water from crawlspace pumps
  • Individual car washing
  • Dechlorinated swimming pool discharges
  • Street wash water
  • Discharges from firefighting activities
  • etc...

IDDE Program

The City does various activities to monitor routinely for illicit discharge. For instance, the City performs:

  • Dry weather screening and inspections on major outfalls 
  • Secondary system inspections
  • Stream assessments

The City works to identify evidence of illicit discharges, utility impacts, or severe erosion in a proactive manner to keep our waterways safe and functional. By understanding the source of pollutants City staff can more effectively eliminate and educate citizens on the hazards of illicit discharge.

More Information

If you have any questions, concerns, or would like to report an illicit discharge please call 502-875-8500 or email