NPDES Stormwater Permit for Naval Air Station Whidbey Island MS4 in Washington

Below is EPA's National Pollutant Discharge Elimination System (NPDES) permit authorizing the discharge of stormwater from all municipal separate storm sewer system (MS4) outfalls at the following two facilities under the command of Naval Air Station Whidbey Island:

• Seaplane Base - Oak Harbor, Crescent Harbor, Crescent Harbor Creek
• Ault Field - Strait of Juan de Fuca, Clover Valley Creek, Dugualla Bay

Permit number: WAS026611
Effective date: February 1, 2021
Permit expires: January 31, 2026

• NPDES Stormwater Permit, Naval Air Station Whidbey Island MS4, #WAS026611 (pdf) (931.81 KB, November 23, 2020)
  Final stormwater permit.
• 2020 NPDES Permit Fact Sheet, Naval Air Station Whidbey Island MS4, #WAS026611 (pdf) (549.39 KB, August 2020)
  Technical basis for revisions to 2019 draft permit.
• 2019 NPDES Permit Fact Sheet, Naval Air Station Whidbey Island MS4, #WAS026611 (pdf) (536.78 KB, September 2019)
  Technical basis for 2019 draft permit.
• Response to Comments on Draft NPDES Stormwater Permit for Naval Air Station Whidbey Island MS4, #WAS026611 (pdf) (338.39 KB, November 2020)
  EPA's responses to public comments on the September 2019 and August 2020 draft permits.
• Designation of Naval Air Station Whidbey Island as a Small MS4 (pdf) (248.54 KB, November 23, 2020)
  EPA's final determination of Naval Air Station Whidbey Island as a small MS4 for the purpose of issuing an NPDES permit to cover municipal stormwater discharges.