Illicit Discharge

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An illicit discharge is defined as any discharge to the municipal separate storm sewer system that is not composed entirely of stormwater, except for discharges allowed under an NPDES permit or waters used for firefighting operations. These non-discharges occur due to illegal connections to the storm drain system from commercial establishments. As a result of these illicit connections, contaminated wastewater enters into storm drains or directly into local waterways without receiving treatment from a wastewater treatment plant. Illicit connections may be intentional or unknown to the business owner.

These connections are often due to the floor drains connected to the storm drainage system. Additional sources of illicit discharges are failing septic systems, illegal dumping practices, and the improper disposal of sewage from recreational practices such as camping.

Illicit Discharges Include:

  • debris
  • bacterial growth
  • sewage
  • iron and other metals
  • blood
  • paint
  • toilet paper
  • chromium
  • industrial discharge
  • septic flow
  • toxic chemicals
  • foam
  • oil
  • suds
  • construction sites
  • rinse water

Concrete Washouts

To raise awareness of proper concrete washout practices for those who work in construction and concrete industries, the City of Marion partnered with the City of Cedar Rapids, the City of Hiawatha, and the Iowa Stormwater Education Program to host a free workshop focused on concrete washouts. View the recording of the presentation:

To Report an Issue 

If you would like to report illegal or illicit discharges of non-storm water, non-irrigation runoff to the stormwater system, please call the City of Marion Stormwater Hotline at (319) 743-6340.  Or submit this online form.