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, 2015 to July 31, 2020. The Term III APDES permit required an update to the 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.

2019 Annual Meeting

The 2019 APDES Annual Meeting was held on Wednesday, February 27th at the BP Energy Center. This year, the format for the meeting was an open house and included a poster display session with breakout discussions on permit related topics. An agenda for the meeting is availible here. The 2020 Annual Meeting will be held on February 26th. If you would like more information on the Annual Meeting, please contact us at 907-343-8135.


2018 Annual Report

Read our 2018 APDES Annual Report for more detailed information about the permit and actions taken to meet permit requirements. The 2018 Annual Report was submitted to the Alaska Department of Conservation on February 15th, 2019.  Last year's annual report can be found HERE.


2018 APDES Annual Report 319 KB
2018 APDES Annual Report Certification Documents 748 KB


App A1a 2018_ADOT MS4_Summary 159 KB
App A1b 2018 MS4 Summary ARDSA 32 KB
App A1c 2018 MS4 Summary 62 KB
App A1d 2018 GSA MS4 Summary 397 KB
App B1 2018 ADOT Construction Projects 202 KB
App B2 ADOT Lake Hood Discharge 1.2 MB
App B3 ADOT Seward Hwy NOV Response 19.5 MB
App C1 ADOT Policy for Design Criteria in MOA 2.2 MB
App C2 2018 LID Evaluation 17.3 MB
App D1 2018 Industrial Facilities Inventory 1.4 MB
App E1a 2018 ADOT Fill Rate Data 517 KB
App E1b 2018 ARDSA Fill Rate Data 232 KB
App E1c 2018 CBERRRSA Fill Rate Data 172 KB
App E2 2018 Covered Sand Storage Evaluation 1.3 MB
App E3a ADOT&PF 2018 Street Sweeping Report 3 MB
App E3b MOA 2018 Street Sweeping Report 15 MB
App E4 2018 Pesticide Application Record 805 KB
App E5a ADOT SWPPP Inspection Reports 8.9 MB
App E5b MOA SWPPP Inspection Reports 37 MB
App E5c CBERRRSA SWPPP Inspection Reports 935 KB
App F1 2018 Prohibited Discharge Complaints Map 184 KB
App F2 2018 Dry Weather Screening Report 272 KB
App G1 2018 Education Summary Report 82 MB
App G2 2018 Annual Meeting Summary 3.3 MB
App G3 2018 Biannual Meeting Summaries 104 KB
App H1 2018 Pesticide Screening Report 3.8MB
App H2 2018 Snow Disposal Site Monitoring Report.pdf
App H3 2018 Stormwater Outfall Monitoring Report 25.8 MB
App H4 Stormwater Monitoring Result Evaluation 1.2 MB
App H5 2018 QAP Update 421 KB