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Illicit Discharge Detection and Elimination (IDDE) Program

The City of Redmond's Illicit Discharge Detection and Elimination (IDDE) Program is a key component of Redmond's National Pollutant Discharge Elimination System (NPDES) Phase II Permit. The goal of IDDE is to reduce the amount of pollution to groundwater, streams, Lake Sammamish, and the Sammamish River from storm sewers.


The project focuses on the elimination of improper connections to the storm sewer system, elimination of illegal dumping into storm sewers and minimizing the amount of seepage into the storm water system from the sanitary sewer system and septic systems.

We all know that what we flush down the toilet ends up at the wastewater treatment plant. What people don't realize is that things that are dumped into stormwater catch basins and drains, go directly to our lakes and rivers without treatment. These are the same lakes, creeks and rivers that we boat, fish and swim in.

The goal of the IDDE is to eliminate the discharges that are harmful to both people and the environment.

To learn more about the City's IDDE program, read the following publication: Focus on the Illicit Discharge Detection and Elimination (IDDE) Program

If you would like to spread the message of protecting our waters by preventing illicit discharges, print and share the City's publication: The River Starts Here 

For more information, please contact the Natural Resources Division Spill Discharge Hotline at 425-556-2868 or email nr@redmond.gov.