Watershed Management

APDES Permit

Our Municipal Separate Storm Sewer System (MS4) discharges stormwater into more than 30 waterways and wetlands within the Municipality of Anchorage (Municipality) and in State of Alaska rights-of-way owned or operated by the Alaska Department of Transportation and Public Facilities (DOT&PF). The National Pollutant Discharge Elimination System (NPDES) Program originated under section 402 of the Clean Water Act (CWA, 33 USC §1251), which requires that pollutant discharges to surface water be authorized by permit. Together, the Municipality and the DOT&PF are authorized to do so through an Authorization to Discharge under the National Pollutant Discharge Elimination System. This authorization, Alaska Pollutant Discharge Elimination System (APDES) Permit No. AKS 05255-8, is effective from August 1, 2020 to July 31, 2025. The new permit will require an update to the Term IV Quality Assurance Plan (QAP).

The APDES Permit also allows discharge of certain non-stormwater flows, as well as stormwater discharge associated with industrial activity and construction. It outlines compliance responsibilities, limitations, and the requirement of a Stormwater Management Program. The permit incorporates a schedule for compliance, and outlines strict monitoring, record keeping, and reporting requirements. Civil, administrative, and even criminal penalties can apply if the conditions of the permit are not met.

2024 Annual Meeting

The 2024 APDES Annual Meeting willl be held on Wednesday, March 6th at the BP Energy Center. A preliminary agenda and a save the date email will be sent to last year's attendees. If you would like more information on the the 2024 Annual Meeting or future Annual Meetings, please contact us at 907-343-8135.


2023 Annual Report COMING February 2024

Our 2023 APDES Annual Report is planned to be submitted to ADEC by February 15th, 2024.


2022 Annual Report

Read our 2022 APDES Annual Report for more detailed information about the permit and actions taken to meet permit requirements. The 2022 Annual Report was submitted to the Alaska Department of Conservation on February 15, 2023. Last year's annual report can be found HERE.


2022 APDES Annual Report 537 KB
2022 APDES Annual Report Certification Documents 864 KB


App A1a 2022 DOT MS4 Summary    119 KB
App A1b 2022 MS4 Summary ARDSA Summary 251 KB
App A1c 2022 CBERRRSA MS4 Summary 3 MB
App B1 2022 DOT MS4 Project List 95 KB
App B2 2022 DOT Construction Compliance Inspections 15 MB
App E1 2022 DOT Street Sweeping Report 7 MB
App E2 2022 MOA Street Sweeping Report 4 MB
App E3a 2022 DOT Facility Annual Inspections    11 MB
App E3b 2022 ARDSA Facility Annual Inspections 21 MB
App E3c 2022 CBERRRSA Facility Annual Inspections  4 MB
App F1 2022 Prohibited Discharges Reported Map 800 KB
App F2 2022 Dry Weather Screening Report 31 MB
App G1 2022 Stormwater Outreach Summary 15 MB
App G2 2022 Annual Meeting Agenda and Presentations 74 MB
App G3 2022 APDES Biannual Meetings Summary    300 KB
App H1 2022 Pesticide Screening Report 3 MB
App H2 2022 MOA Stormwater Outfall Monitoring Report 31 MB