An illicit discharge occurs when pollutants or other substances enter the storm sewer system from sources other than stormwater. These discharges can harm water quality, wildlife, the environment, and public health.
What counts as an illicit discharge?
Examples include:
- Oil, gasoline or other automotive fluids leaking or being dumped into a storm drain.
- Paint, cleaning products, chemicals or soapy wash water flowing into a storm drain.
- Sewage or wastewater entering a storm drain.
- Sediment, muddy water or concrete washout from construction sites entering a storm drain, ditch or nearby waterbody.
- Grass clippings, leaves, pet waste or other debris being dumped or washed into storm drains.
- Swimming pool water containing chlorine or other chemicals draining into a storm sewer.
- Unusual water flowing from a storm drain during dry weather, especially if it has an unusual color, oily sheen, foam or a strong odor.
If you see a suspected illicit discharge, report it immediately to the Minnesota Duty Officer.
Under Minnesota law (Minn. Stat. § 115.061), all discharges, whether accidental or intentional, must be reported immediately. This includes hazardous substance releases and stormwater carrying sediment.
Contact the Minnesota Duty Officer:
- Phone:651-649-5451
- Toll-free:800-422-0798
- Available:24 hours a day, 7 days a week
When reporting, be prepared to share the location, the type of discharge or pollutant observed, and any actions already taken. Do not put yourself at risk to investigate or stop a discharge.