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NPDES Stormwater Permit for Idaho Transportation Department District #2

Below are EPA's National Pollutant Discharge Elimination System (NPDES) municipal separate storm sewer system (MS4) permit and supporting documents for the Idaho Transportation Dept. District #2 (ITD2) within the Lewiston Urbanized Area in Nez Perce, County.

  • Permit number: IDS028258
  • Effective date: November 1, 2020
  • Permit expires: September 30, 2025​

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