Illicit Discharges and Reporting

Illicit Discharges and Reporting

The Las Vegas Valley’s Municipal Separate Storm Sewer System (MS4) Permit requires the co-permittees to implement an Illicit Discharge Detection and Elimination (IDDE) program. The purpose of the IDDE program is to prevent non-stormwater discharges from contributing a significant amount of pollution to the MS4 and ultimately to Lake Mead. Materials that enter the storm drain system do not go to a wastewater treatment plant.

What is an Illicit Discharge?
Clark County defines an illicit discharge as the release of non-stormwater (except those exemptions specifically identified in Clark County Code 24.40.031(a) to the storm drain system. Generally, illicit discharges impair water quality by contributing pollutants to the storm drain system and depositing them into a local water body.

Examples of Illicit Discharges
Common illicit discharges include:
  • Improper disposal of vehicle fluids, household hazardous wastes (e.g., coolant, oil, paint, pesticides, etc.)
  • Inappropriate disposal of yard clippings and pet wastes.
  • Fats, oil and grease from restaurants
  • Chemical discharges from construction and industrial activities
  • Sediment, wash water, and debris from construction and industrial sites
  • Sewage and septic effluent
  • Trash and dumping of materials
Sediment    Dock
Vehicle Oil   Chemical Spill

How Can I Report an Illicit Discharge?
A key element of a successful IDDE program is to have public involvement. If you see evidence of an illicit discharge, report it to the Water Quality Team!
How is the Illicit Discharge Eliminated?

Clark County Water Quality will:
  • Perform an inspection to identify the discharge source.
  • Mandate corrective actions escalate enforcement when warranted.
  • Verify the cleanup of the illicit discharge.
  • Educate on Best Management Practices to prevent future illicit discharges.

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