Anchorage, AK Environmental Rules: Erosion Control (2026)

Storm water treatment plan approval is required prior to commencement of land clearing or ground disturbing activities; the discharge of surface water (including from snow disposal sites); the construction, alteration, installation, modification, or operation of a storm water treatment or disposal system; demolition or utility work; connection to the municipal separate storm sewer system; work in water bodies, wetlands, or watercourses; or dewatering activities, except as listed in E.4 below. All construction, development, and maintenance activities shall be in accordance with the approved storm water treatment plan.

3. Nonconformities. No nonconforming rights are granted for this section 21.07.040E.

4. Exceptions. A storm water treatment plan shall not be required for the following. An erosion control plan may still be required if the discharge is so concentrated as to cause soil disturbance. The municipal engineer may waive the requirement for a storm water treatment plan for other activities that, in his or her judgment, will not create erosion or impair water quality.

a. Building improvements where no earth is disturbed;

b. Any earth disturbance that is less than 500 square feet in area;

c. Agricultural activities (not including site landscaping). Discharges from agricultural activities are still subject to water quality standards and potential enforcement for illicit discharges to watercourses or the storm sewer system;

d.