Environmental Rules in Matanuska-Susitna Borough, AK (2026)
2 rules for unincorporated Matanuska-Susitna Borough, Alaska.
Verified from official government sources
Flood Zones
Any construction, fill, or development within a mapped special flood hazard area of the Matanuska-Susitna Borough requires a development permit under MSB § 17.29.100 before work begins. The permit covers all structures, including manufactured homes, and every development activity defined in Chapter 17.29, from grading to storage of materials. The Planning Department director reviews and issues the permit.
Mat-Su Borough Flood Hazard Development Permit
Some RestrictionsMatanuska-Susitna Borough Code § 17.29.100
A development permit shall be obtained before construction or development begins within any area of special flood hazard established in MSB § 17.29.060. The permit shall be for all structures, including manufactured homes, as set forth in the definitions, and for all development including fill and other activities, also as set forth in the definitions.
Flood Elevation Requirements
Where base flood elevation data exists, MSB § 17.29.170(A)(1)(a) requires new and substantially improved residential structures in the Matanuska-Susitna Borough's special flood hazard areas to elevate the lowest floor, including any basement, at least two feet above base flood elevation. Nonresidential buildings get an elevate-or-floodproof choice at the same two-foot freeboard.
Mat-Su Borough Base Flood Elevation Freeboard
Some RestrictionsMatanuska-Susitna Borough Code § 17.29.170(A)(1)(a)
New construction and substantial improvement of any residential structure shall have the lowest floor, including basement, elevated a minimum of two feet above base flood elevation.
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