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Storm Water Program

The goal of the Storm Water Program is to reduce or eliminate pollutants in storm water. Storm water discharges are generated by runoff from land and impervious areas such as paved streets, parking lots, and building rooftops, during rainfall and snowmelt events. Storm water discharges often contain pollutants in quantities that could adversely affect water quality.

Highlights of Multi-Sector General Permit (2020 MSGP)

In August 2019, DEC began the process of reissuing the Multi-Sector General Permit (MSGP) for Storm Water Discharges Associated with Industrial Activity. During the fall the permit was drafted, and went through public review and revision. The 2020 MSGP was reissued on February 21, 2020 as AKR060000 and will go into effect April 1, 2020.

Existing permittees will have 120 days from April 1, 2020 (to July 29, 2020) to revise their Storm Water Pollution Prevention Plan (SWPPP) and submit the SWPPP with a new Notice of Intent (NOI) application. Existing permittees should have already received invoices for the general permit authorization annual fee. Please pay the invoice. If you file electronically, please check the box in the on-line application that says you paid via invoice.

Highlights of Ted Stevens Anchorage International Airport General Permit (ANC-GP)

DEC has developed a storm water general permit specifically for the Ted Stevens Anchorage International Airport. This permit replaces the Multi-Sector General Permit (MSGP) for industrial facilities working on the airport property. The ANC-GP was issued on September 25, 2019 as AKR061000 and went into effect November 1, 2019.

MSGP permittees have 120 days from November 1, 2019 (to February 28, 2020) to revise their Storm Water Pollution Prevention Plan (SWPPP) and submit the revised SWPPP with a new Notice of Intent (NOI) application. The NOI and SWPPP can be submitted via email to

Permittees who have submitted their NOI and SWPPP will continue to operate under the MSGP until they receive their notification to operate under the ANC-GP.

Municipality of Anchorage and Port of Alaska - Municipal Separate Storm Sewer Systems (MS4)

All operators of regulated MS4s are required to:

  • Obtain a APDES permit, and
  • Develop a storm water management program designed to prevent harmful pollutants from being washed by storm water runoff into the MS4 (or from being dumped directly into the MS4), then discharged from the MS4 into local waterbodies.

Storm water management program should meet the standard of "reducing pollutants to the Maximum Extent Practicable (MEP), and include measures to:

  • Identify major outfalls and pollutant loadings
  • Detect and eliminate non-storm water discharges to the system
  • Reduce pollutants in runoff from industrial, commercial, and residential areas

The Municipality of Anchorage MS4 and Port of Alaska MS4 permits are undergoing review and will go out for public comment this spring 2020. If you want to receive notice of the start of the public comment period you can subscribe to the dec-apdes notification list.


Program Manager, Storm Water and Wetlands
Jim Rypkema: 907-334-2288
CGP, MSGP, MS4 permits, Storm Water Plan Review, Excavation Dewatering and Hydrostatic General Permit authorizations
William Ashton: 907-269-6283
CGP, Wetlands, 401 Certification of 404 Permits, Pesticide General Permit
Angela Hunt: 907-269-7599
Wetlands, 401 Certification of 404 Permits, Pesticide General Permit
Teri Buck: 907-334-2281
APDES eNOI system, Online Application System (OASys), Notice of Intent (NOI)
Shonda Oderkirk: 907-451-2881

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