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Illicit Discharge Detection and Elimination

Best Management Practices (BMPs) in this category are designed to eliminate all substances other than stormwater from entering the stormwater system. The storm drain system flows directly into one of the seven surface waters that receive stormwater discharges from the City of Kalispell without any treatment, which include:

  • Whitefish River
  • Stillwater River
  • Ashley Creek
  • Spring Creek
  • Bowser-Spring Creek
  • Unnamed perennial surface water tributary to Ashley Creek from Foys Lake

The results of illicit discharges are untreated discharges that contribute high levels of pollutants, including heavy metals, toxins, oil and grease, solvents, nutrients, viruses, and bacteria to receiving streams and rivers.

Kalispell's Stormwater Management Programs contains six BMPs in the Illicit Discharge Detection and Elimination category including:

  • IDDE-1 Assessment of "significant" Non -Stormwater Discharges
  • IDDE-2 Assessment of "Occasional Incidental" Non-Stormwater Discharges
  • IDDE-3 Kalispell Stormwater System Mapping
  • IDDE-4 Illicit Discharge Ordinance and Enforcemetn Response Plan (ERP)
  • IDDE-5 IDDE Collaboration with Neighboring MS4-MDT
  • IDDE-6 Illicit Discharge Detection and Elimination (IDDE) Program

To report an Illicit Discharge you can email a completed Report Illicit Discharge Form to the City of Kalispell or call the Stormwater Hotline.

What is legal to enter the storm drain system?

"No person shall throw, drain, or otherwise discharge, cause, or allow others under its control to throw, drain, or otherwise discharge into the MS4 any pollutants or waters containing any pollutants, other than storm water." -Kalispell Ordinance 1634

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