Every grading permit application in Sonoma must include an erosion and sediment control plan, and engineered or sensitive-area projects require certification by a Certified Erosion Control Specialist.
Sonoma Municipal Code Ch. 14.20 (Excavations, Grading and Fills) sets the city's erosion control framework. SMC 14.20.205 requires that an erosion and sediment control plan, prepared by a civil engineer or other qualified professional, be submitted as part of every grading permit application and delineate measures to effectively minimize soil erosion and sedimentation. For engineered grading projects, or when the City Engineer directs in sensitive areas, the plan must be prepared by a Certified Erosion Control Specialist (CESSWI/CPESC). The chapter also includes design criteria for erosion control plans, mandatory inspection during work, and enforcement provisions including stop-work orders and permit revocation. SMC 13.32 layers in NPDES-driven BMP requirements (the State General Permit for Construction also requires a SWPPP for any project disturbing 1+ acre). Permits expire if work is not commenced within 180 days or completed within one year (SMC 14.20.050).
Soil disturbance without an approved erosion control plan, failure to maintain BMPs, or sediment discharge to storm drains violates SMC 14.20 and 13.32. The City Engineer may issue a stop-work order, revoke the grading permit, and require corrective action and bond forfeiture. State Water Board enforcement of the Construction General Permit can add penalties up to $10,000 per day under Calif. Water Code §13385.
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