NPDES Permit for Petersburg Wastewater Treatment Plant in Alaska

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

Permit number: AK0021458
Effective date: November 1, 2025
Permit expires: October 31, 2030

• NPDES Permit, Borough of Petersburg Wastewater Treatment Plant, #AK0021458 (pdf) (954.5 KB, Signed September 30, 2025)
  Final 301(h)-modified wastewater permit.
• Final 301(h) Decision Document, Borough of Petersburg Wastewater Treatment Plant, #AK0021458 (pdf) (6.11 MB, Signed September 30, 2025)
  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, Borough of Petersburg Wastewater Treatment Plant, #AK0021458 (pdf) (438.8 KB, Signed December 6, 2024)
  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 NPDES Permit, Borough of Petersburg Wastewater Treatment Plant, #AK0021458 (pdf) (399.77 KB, September 2025)
  EPA's responses to comments received during the public comment period for the draft permit and tentative 301(h) decision from August 8 through September 23, 2024.​
• NPDES Permit Fact Sheet, Borough of Petersburg Wastewater Treatment Plant, #AK0021458 (pdf) (2.68 MB, August 2024)
  Technical basis for August 2024 draft permit.