Eliminating illicit discharges within our storm sewers through an illicit discharge detection and elimination (IDDE) program is critical to improving the overall health of local waterways. Illicit discharges, like stormwater runoff generated within the municipal separate storm sewer system (MS4), flow directly into a receiving waterbody. Whereas post-construction stormwater control measures (SCMs) are designed to reduce typical pollutants (e.g. sediment, trash, and nutrients) in stormwater runoff prior to it entering receiving waters, illicit discharges pose a unique challenge because they contain atypical pollutants that can go untreated and may also increase the maintenance frequency of post-construction SCMs.
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