NPDES Permit for Sitka Wastewater Treatment Facility in Alaska

Below is EPA's National Pollutant Discharge Elimination System (NPDES) permit for the City and Borough of Sitka Wastewater Treatment Plant in Alaska. The facility discharges primary treated effluent to Sitka Sound under a Clean Water Act section 301(h)-modified permit.

Permit number: AK0021474
Effective date: November 1, 2025
Permit expires: October 31, 2030

• NPDES Permit, Sitka Wastewater Treatment Plant, #AK0021474 (pdf) (2 MB, December 5, 2024)
  Final 301(h)-modified wastewater permit.
• Final 301(h) Decision Document, Sitka Wastewater Treatment Plant, #AK0021474 (pdf) (6.08 MB, November 15, 2024)
  EPA's final decision on whether the facility continues to qualify for a Clean Water Act section 301(h)-modified permit to discharge primary treated effluent. Includes mixing zone dilution modeling.
• Section 401 Water Quality Certification, Sitka Wastewater Treatment Plant, #AK0021474 (pdf) (486.9 KB, September 7, 2023)
  State of Alaska's final Clean Water Act section 401 water quality certification for the marine water discharge of primary treated domestic wastewater.
• Response to Comments on Draft Permit for Sitka Wastewater Treatment Plant, #AK0021474 (pdf) (432.19 KB, December 2024)
  EPA's responses to comments received during the public comment period for the draft permit and tentative 301(h) decision from June 7 through July 24, 2023.
• NPDES Permit Fact Sheet, City and Borough of Sitka Wastewater Treatment Plant, #AK0021474 (pdf) (13.54 MB, June 2023)
  Technical basis for the June 2023 draft permit.
• Frequent Questions About 301(h) Facilities in Southeast Alaska (pdf) (211.93 KB, December 2024)
  Answers to common questions regarding Clean Water Act 301(h)-modified permits for publicly owned wastewater treatment facilities in Southeast Alaska.