Benton County, WA Environmental Rules: Erosion Control (2026)
Key Facts
- When Required
- All ground disturbance
- Dust Rule
- Benton Clean Air Agency PM10
- Measures
- Silt fence, watering, cover
- County Rule
- Critical areas ordinance
Summary
Land-disturbing work in Benton County requires erosion and sediment control, and the arid, windy climate adds a fugitive-dust problem. Grading permits carry an erosion control plan, while the Benton Clean Air Agency regulates PM10 dust from cleared and graded ground.
Each county and city shall adopt development regulations that protect critical areas that are required to be designated under RCW 36.70A.170.
Full Breakdown
Benton County's dry, wind-swept Columbia Basin makes both water and wind erosion a concern. Bare, graded soil blows as fugitive dust, so the Benton Clean Air Agency requires reasonable measures such as watering, gravel, or cover to control PM10 particulate from construction sites and cleared land. County grading permits require a sediment control plan using silt fence, straw wattles, and stabilized construction entrances, with disturbed soil stabilized promptly near the Columbia and Yakima rivers. Sites of one acre or more also fall under Ecology's construction stormwater permit. The county's critical areas ordinance adds review for erosion-hazard and geologically hazardous ground.
Violations & Fines
Missing erosion controls bring a stop-work order and fines, and uncontrolled dust can draw Benton Clean Air Agency enforcement. Sediment discharged into the Columbia or Yakima rivers can trigger state water-quality penalties.
Frequently Asked Questions
Do I need erosion control for a small project?
Who handles dust from my cleared lot?
Sources & Official References
Other rules in Benton County
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