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.

2022 Annual Meeting

The 2022 APDES Annual Meeting was held on Wednesday, March 2nd. This year, the meeting was held online via MS Teams. The agenda for the meeting and copy of the presentation slides is availible here. If you would like more information on the the 2022 Annual Meeting or future Annual Meetings, please contact us at 907-343-8135..


2021 Annual Report

Read our 2021 APDES Annual Report for more detailed information about the permit and actions taken to meet permit requirements. The 2021 Annual Report was submitted to the Alaska Department of Conservation on February 15, 2022. Last year's annual report can be found HERE.


2021 APDES Annual Report 537 KB
2021 APDES Annual Report Certification Documents 864 KB


App A1a 2021 DOT MS4 Summary    4.3 MB
App A1b 2021 MS4 Summary ARDSA Summary 134 KB
App A1c 2021 CBERRRSA MS4 Summary 246 KB
App A1d 2021 GSA MS4 Summary  68 KB
App B1 2021 DOT MS4 Project List 90 KB
App B2 2021 DOT Construction Discharge Reports 2 MB
App B3 2021 DOT Construction Compliance Inspections 10 MB
App D1 2021 Industrial Facilities Inventory 2 MB
App E1 2021 DOT Street Sweeping Report 3 MB
App E2 2021 MOA Street Sweeping Report 3.6 MB
App E3 2021 Pesticide Use 900 KB
App E4a 2021 DOT Facility Annual Inspections    11 MB
App E4b 2021 ARDSA Facility Annual Inspections 21 MB
App E4c 2021 CBERRRSA Facility Annual Inspections  406 KB
App F1 2021 Prohibited Discharges Reported Map 800 KB
App F2 2021 Dry Weather Screening Report 200 MB
App F3 2021 MOA Spill Response Procedure Update 134 KB
App G1 2021 Stormwater Outreach Summary 13 MB
App G2 2021 Annual Meeting Agenda and Presentations 15 MB
App G3 2021 APDES Biannual Meetings Summary    369 KB
App H1 2021 MOA Stormwater Outfall Monitoring Report 30 MB