Seattle, WA Environmental Rules: Erosion Control (2026)

070 governs what an owner must submit to obtain a Seattle grading permit. 2, after initial screening of the application, the Director may require a description of methods to be used to minimize sediment or other pollution from leaving the site during and after construction and to protect cleared areas and cut and fill slopes from erosion, along with a construction schedule addressing minimization of grading on unprotected soil surfaces and restoration of topsoil and vegetative cover. Grading plans for jobs moving more than 2,500 cubic yards must be prepared by a licensed civil engineer, and the Director can require the same for smaller jobs in geologic hazard areas or areas with known erosion problems.

B requires any special inspector assigned to the site to inspect the clearing, excavating, filling, compaction, grading, preloading, and erosion and drainage control measures, observe whether the work complies with approved plans, and immediately notify the Director of any threat to public health, safety, welfare, property, or the environment. A to confirm work matches the permit, and may initiate enforcement for violations. A bars final approval of a grading permit until all work, including installation of all drainage control facilities and their protective devices and all erosion control measures, has been completed according to the final approved plans and required reports have been submitted.

010 against any discharge that causes or contributes to a water-quality violation or a violation of the City's municipal stormwater NPDES permit, and the City may waive erosion control permit and document requirements for public-entity property only where discharges don't reach the public drainage system.