Benton County requires a grading permit for significant excavation or fill. Drainage must not be redirected onto neighboring land, and retaining walls over four feet need engineered plans and a separate permit.
Benton County regulates grading and drainage through its building and public works codes, applying the International Building Code grading provisions. A permit is required once excavation or fill passes the code threshold, and site grading must direct runoff away from structures and neighboring parcels. Across the county's irrigated farmland and Red Mountain vineyards, grading also cannot interfere with irrigation district ditches and drains. Retaining walls over four feet, measured from the bottom of the footing, require engineered plans. Grading on steep or unstable slopes triggers geotechnical review under the county's critical areas rules. Owners maintain drainage facilities on their own land.
Unpermitted grading brings a stop-work order and fines. Redirecting drainage or irrigation flows onto a neighbor's property requires corrective work and can create civil liability for resulting damage.
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Benton County, WA
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