Draft NPDES Stormwater Permit for Washington Department of Transportation MS4 in Washington

EPA is proposing to issue a National Pollutant Discharge Elimination System (NPDES) stormwater permit to the Washington State Department of Transportation (WSDOT) for discharges to surface waters of the Puyallup Tribe of Indians from the identified municipal separate storm sewer system (MS4) outfalls that are owned and/or operated by WSDOT, and that are located on land held in trust by the federal government within the 1873 Survey Area of the Puyallup Reservation in Tacoma, Washington, and/or that directly discharge to surface waters of the Puyallup Tribe.

Although the EPA accepted comments on prior drafts of the WSDOT MS4 permit (in calendar years 2021 and 2022, respectively) a final permit has not yet been issued. After significantly revising the draft WSDOT MS4 permit based on prior public input, and upon considering new information regarding appropriate stormwater management techniques to protect water quality, EPA is now requesting comments on the revised draft permit.

Permit number: WAS026743

Current draft permit

• 2026 Draft NPDES Stormwater Permit, Washington Dept. of Transportation (WSDOT) MS4, #WAS026743 (pdf) (801.18 KB, August 2026)
  Revised draft stormwater permit.
• 2026 NPDES Permit Fact Sheet, Washington Dept. of Transportation (WSDOT) MS4, #WAS026743 (pdf) (1.49 MB, August 2026)
  Technical basis for 2026 revised draft permit.

Previous draft permits

• 2022 Draft NPDES Stormwater Permit, Washington Dept. of Transportation (WSDOT) MS4, Washington, #WAS026743 (pdf) (2.04 MB, July 2022)
  Revised draft stormwater permit.
• 2022 NPDES Permit Fact Sheet, City of Tacoma MS4 (#WAS026689), Pierce County MS4 (#WAS026875), WSDOT MS4 (#WAS026743) (pdf) (1.44 MB, July 2022)
  Technical basis for EPA's 2022 re-proposal of three draft stormwater permits on tribal trust lands within the Puyallup Reservation.
• 2021 Draft NPDES Stormwater Permit, Washington Dept. of Transportation (WSDOT) MS4, Washington, #WAS026743 (pdf) (1.46 MB, April 2021)
  Draft stormwater permit.
• 2021 NPDES Permit Fact Sheet, City of Tacoma MS4 (#WAS026689), Pierce County MS4 (#WAS026875), WSDOT MS4 (#WAS026743) (pdf) (1.35 MB, April 2021)
  Technical basis for EPA's 2021 proposal of three draft stormwater permits on tribal trust lands within the Puyallup Reservation.