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Illicit Discharge Detection and Elimination

Federal regulations mandate that municipalities throughout the United States, implement an illicit discharge detection and elimination system. An illicit discharge is defined by the U.S. Environmental Protection Agency as, “any discharge to a municipal storm sewer system that is not composed entirely of stormwater.” 

Examples of illicit discharges include oil, paint, yard waste, lawn chemicals, pet waste, commercial or industrial wash water, trash and sediment from construction sites.

View the video below, "Illicit Discharge - A Grate Concern," for examples of illicit discharges.

Video credit:  EXCAL Visual 2013

We need your help.  If you suspect an illicit discharge or have any other Stormwater concerns, please contact us at or 520-229-4816.

There are some non-stormwater discharges that are allowed into the municipal storm sewer network, including clean irrigation water, sump pump discharges, water from fire-fighting activities, and most residential car washing.

The Spa and Pool Discharge Requirements (PDF) flyer includes information on how to properly drain your swimming pool.

The Town of Oro Valley welcomes comments on the Stormwater Management Plan (SWMP). You may submit comments at any time to the Town of Oro Valley Stormwater Utility Division Manager, John Spiker at (520) 229-5044 or