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.

2021 Annual Meeting

The 201 APDES Annual Meeting was held on Wednesday, February 24th. This year, the meeting was held online via MS Teams. With a vitural presentation the normal format was modifed from the normal open house. The agenda for the meeting and copy of the presentation slides is availible here. If you would like more information on the the 2021 Annual Meeting or future Annual Meetings, please contact us at 907-343-8135.


2020 Annual Report

Read our 2020 APDES Annual Report for more detailed information about the permit and actions taken to meet permit requirements. The 2020 Annual Report was submitted to the Alaska Department of Conservation on February 15, 2021. Last year's annual report can be found HERE.


2020 APDES Annual Report 637 KB
2020 APDES Annual Report Certification Documents 1.4 MB


App A1 Fourth Term Storm Water Management Plan   572 KB
App A2 Fourth Term Interjurisdictional Agreement between MOA & DOT&PF 484 KB
App A3 Fourth Term Coordination Plans 15.6 MB
App A4a 2020 DOT&PF MS4 Summary  5.2 MB
App A4b 2020 ARDSA MS4 Summary 255 KB
App A4c 2020 CBERRRSA MS4 Summary 243 KB
App A4d 2020 GSA Summary 222 KB
App B1 2020 Construction Projects Reviewed and Approved by DOT&PF 87 KB
App B2 Fourth Term Escalating Enforcement MOA 192 KB
App B3 2020 DOT Construction Discharge Report 4.8 MB
App B4 2020 DOT Construction Compliance Inspections 48.6 MB
App B5 2020 CESCL Extension   130 KB
App E1a DOT&PF Rate of Fill Cleaning Schedules 577 KB
App E1b ARDSA Rate of Fill Cleaning Schedules 5.1 MB
App E2 Fourth Term Street Sweeping Plan DOT&PF 2.9 MB
App E3 Fourth Term Street Sweeping Plan MOA 4.5 MB
App E4 2020 MS4 Street Sweeping Report DOT&PF 4.6 MB
App E5 2020 MS4 Street Sweeping Report MOA 4.4 MB
App E6 2020 MOA Pesticide Application Summary 1.6 MB
App E7a 2020 DOT&PF Facility SWPPP Inspection Reports 1.7 MB
App E7b 2020 ARDSA Facility SWPPP Inspection Reports 22 MB
App E7c 2020 CBERRRSA Facility SWPPP Inspection Reports 1.4 MB
App E7d 2020 Girdwood Facility SWPPP Inspection Reports 219 KB
App F1 2020 Anchorage Prohibited Discharge Complaint Map 800 KB
App F2 2020 Dry Weather Screening Report 109 MB
App G1 2020 Education Summary Report 31 MB
App G2 2020 Watershed Perception Survey 2.4 MB
App G3 2020 Anchorage APDES Annual Meeting Summary 17.6 MB
App G4 2020 Anchorage APDES Bi-annual Meeting Summaries 197 KB
App H4 2020 QAP Update 9.8 MB
App H2 2020 Stormwater Outfall Monitoring Report 52 MB