SWPPP Requirements in Alaska

Who needs a SWPPP in Alaska?

Any construction project that disturbs one acre or more — or is part of a larger common plan of development reaching one acre — needs a SWPPP under Alaska permit AKR100000.

Alaska runs its own delegated stormwater program. Operators obtain coverage from Alaska Department of Environmental Conservation (DEC), Wastewater Discharge Authorization Program under APDES General Permit for Discharges from Large and Small Construction Activities (Construction General Permit) (AKR100000), not directly from the EPA. A small subdivision, a solar pad, and a road-widening project all clear the same one-acre line.

Alaska adds requirements worth flagging early: Submit the NOI and pay the general permit authorization fee through DEC’s Environmental Data Management System (EDMS) at least five business days before construction; discharge is authorized only on the date in DEC’s written authorization letter (Parts 2.2.1.5–2.2.1.6, 2.3.1, 2.5); Projects disturbing 5 acres or more outside an MS4 area submit a copy of the SWPPP to DEC with the NOI (Part 2.1.3); projects inside an APDES-permitted MS4 (Anchorage, Fairbanks, North Pole, JBER, Port of Alaska, Fort Wainwright) submit the SWPPP and any required information to the MS4 operator (Parts 2.1.2 and 2.1.4); Initiate stabilization immediately (no later than the end of the next work day) once soil disturbance on any portion of the site has permanently ceased, or has temporarily ceased and will not resume for more than 7 calendar days where mean annual precipitation is 40 inches or more (14 calendar days where it is less); the clock starts as soon as you know with reasonable certainty work will stop that long (Part 4.5.1.1); Plan for winter shutdown: record anticipated fall freeze-up and spring thaw dates in the SWPPP and stabilize conveyance channels, slopes, disturbed soils, and stockpiles before fall freeze-up (Parts 4.12.1 and 5.3.6.9); Post a sign near the main entrance with the permit authorization number, operator contact, and SWPPP location (Part 5.10.1); Show on the site map all waters of the U.S. (including wetlands of 10,000 square feet or more) within 2,500 feet of the site and any public water system drinking water protection areas that intersect the project (Parts 5.3.5.15–5.3.5.16); Discharges to a Category 5 water impaired for turbidity or sediment with 20 or more acres disturbed at once: written monitoring plan, upstream/downstream turbidity sampling, and an annual report by December 31 (Parts 3.2.1, 7.0, 9.1); Submit engineering plans for permanent storm water management controls at least 30 days before construction, and cationic treatment chemical / active treatment system details at least 14 days before use (Parts 2.1.1, 2.1.5); Submit the Notice of Termination within 30 calendar days of project completion (Table 1, Part 10.2).

What the plan must contain

An Alaska SWPPPis the site's compliance binder — the document an inspector opens first. It documents:

1. 1Site & project descriptionTotal and disturbed acreage, soils, slopes, and the sequence of construction.
2. 2Receiving waters & discharge pointsWhere stormwater leaves the site and the waterbodies it reaches.
3. 3Erosion & sediment control BMPsSilt fence, stabilized entrances, inlet protection, and stabilization measures.
4. 4Inspection schedule & recordsDated, signed inspection logs and the corrective actions taken.
5. 5Operator certificationThe SWPPP is signed by the legally responsible party before work begins.

Required and conditional BMPs

Filing your Notice of Intent

Submit the NOI (and, for 5 or more acres outside an MS4, the SWPPP) through DEC’s Environmental Data Management System (EDMS) and pay the authorization fee under 18 AAC 72.956; small construction activities may instead certify a waiver under Part 1.5 / Appendix D at least five business days before construction.

A Notice of Termination closes coverage once the site reaches final stabilization. Keeping the SWPPP and its inspection records on site is what keeps a project clear of stop-work orders.

Inspection requirements

The permit allows 2 inspection schedules; the operator follows one and records the choice in this plan: (a) 7-day schedule — inspect at least once every 7 calendar days (AKR100000 Part 6.1.1.1); or (b) 14-day schedule with storm inspections — inspect at least once every 14 calendar days and within 24 hours of the end of a storm event that resulted in a discharge from the site (AKR100000 Part 6.1.1.2). Inspections begin immediately after initial soil disturbance, and the SWPPP must specify which schedule will be followed (AKR100000 Parts 6.1.1 and 6.1.2). Every inspection is dated and signed, and any failed control is corrected before the next storm.

How Alaska differs from the federal permit

Because Alaska administers its own program, the federal EPA Construction General Permit does not apply directly here — the state permit governs. Sites inside a regulated municipal storm sewer system may carry additional local ordinance requirements on top of the state permit.

Frequently asked questions