Environmental Rules in Sammamish, WA (2026)
4 verified environmental rules for Sammamish, Washington, sourced directly from the municipal code and official government pages.
Verified from official government sources
Stormwater Management
Sammamish requires erosion and sediment control on any land-disturbing activity, whether or not it needs a clearing and grading permit, and separately requires drainage review under the King County Surface Water Design Manual, with a points-based penalty matrix for surface water violations.
Sammamish Stormwater and Erosion Control Rules
Significant RestrictionsSammamish Municipal Code § 16.15.090(1)
16.15.090 Operating conditions and standards of performance. (1) Any activity that will clear, grade, or otherwise disturb the site, whether requiring a clearing or grading permit or not, shall provide erosion and sediment control (ESC) that prevents, to the maximum extent possible, the transport of sediment from the site to drainage facilities, water resources, and adjacent properties. Erosion...
Erosion Control
Sammamish requires erosion and sediment control on every site that is cleared or graded, whether a permit is needed or not. SMC 16.15.090 makes the property owner responsible for keeping sediment out of drainage facilities, streams, wetlands and neighboring lots, backs it with tighter wet-season rules, and gives violators just 24 hours to fix a failure before work can be shut down.
Sammamish Erosion and Sediment Control Rules
Some RestrictionsSammamish Municipal Code § 16.15.090(1)
Any activity that will clear, grade, or otherwise disturb the site, whether requiring a clearing or grading permit or not, shall provide erosion and sediment control (ESC) that prevents, to the maximum extent possible, the transport of sediment from the site to drainage facilities, water resources, and adjacent properties. Erosion and sediment controls shall be applied as specified by the tempo...
Flood Zones
Sammamish requires a development permit before any construction, fill, grading or other development begins in a mapped area of special flood hazard, under Municipal Code 15.10.110. The chapter applies to all such areas within City jurisdiction and is enforced with misdemeanor penalties of up to $1,000 and 90 days in jail per violation.
Sammamish Floodplain Development Permit Rule
Significant RestrictionsSammamish Municipal Code § 15.10.110
15.10.110 Establishment of development permit. (1) Development Permit Required. A development permit shall be obtained before construction or development begins within any area of special flood hazard established in SMC 15.10.060. The permit shall be for all structures including manufactured homes, as set forth in SMC 15.10.040, Definitions, and for all development including fill and other acti...
Flood Elevation Requirements
In mapped AE and A1-30 flood zones, Sammamish Municipal Code 15.10.160 requires new residential construction and substantial improvements to elevate the lowest floor, including any basement, at least one foot above the base flood elevation. Mechanical equipment and utilities must be waterproofed or elevated the same one-foot minimum.
Sammamish Base Flood Elevation Freeboard Rule
Significant RestrictionsSammamish Municipal Code § 15.10.160(1)(a)
15.10.160 Specific standards. In all areas of special flood hazards where base flood elevation data has been provided as set forth in SMC 15.10.060 ... or SMC 15.10.130(2) ..., the following provisions are required: (1) Residential Construction. (a) In AE and A1-30 zones or other A zoned areas where the BFE has been determined or can be reasonably obtained, new construction and substantial impr...
Looking for King County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Sammamish city rules.
Environmental Rules in King County →