Illicit Discharge Detection and Elimination

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This Illicit Discharge Detection and Elimination (IDDE) Plan has been developed by Town of Spencer to address the requirements of the United States Environmental Protection Agency’s (USEPA’s) 2016 National Pollutant Discharge Elimination System (NPDES) General Permit for Stormwater Discharges from Small Municipal Separate Storm Sewer Systems (MS4) in Massachusetts, hereafter referred to as the “2016 Massachusetts MS4 Permit” or “MS4 Permit.”


The 2016 Massachusetts MS4 Permit requires that each permittee, or regulated community, address six Minimum Control Measures.  These measures include the following:

  1. Public Education and Outreach
  2. Public Involvement and Participation
  3. Illicit Discharge Detection and Elimination Program
  4. Construction Site Stormwater Runoff Control
  5. Stormwater Management in New Development and Redevelopment (Post Construction Stormwater Management); and
  6. Good Housekeeping and Pollution Prevention for Permittee Owned Operations.

Under Minimum Control Measure 3, the permittee is required to implement an IDDE program to systematically find and eliminate sources of non-stormwater discharges to its municipal separate storm sewer system and implement procedures to prevent such discharges. The IDDE program must also be recorded in a written (hardcopy or electronic) document. This IDDE Plan has been prepared to address this requirement.