Garden Grove requires grading permits for excavation, fill, and earthwork projects under Municipal Code Chapter 15.40. All grading must maintain proper drainage to prevent water from flowing onto neighboring properties. A grading plan prepared by a licensed engineer is typically required.
Garden Grove regulates grading and drainage under Municipal Code Chapter 15.40 (Grading) based on the California Building Code Appendix J. A grading permit is required for excavation or fill exceeding exempt thresholds, typically 50 cubic yards of cut or fill. Grading plans must be prepared by a California-licensed civil engineer and show existing and proposed grades, drainage patterns, erosion control measures, and retaining wall details. All grading must maintain natural drainage patterns and prevent stormwater from flowing onto adjacent properties. Drainage must be directed to approved outlets such as streets, storm drains, or on-site retention facilities. Building pads must slope away from structures at a minimum of 2% for the first 10 feet. Projects in or near FEMA flood zones must comply with additional floodplain management requirements. Rough and final grading inspections by the city are required before any construction proceeds. A soils and geological report may be required for certain projects.
Grading without a permit or contrary to approved plans is a code violation subject to stop-work orders, administrative citations, and fines. Unauthorized grading that causes drainage problems onto neighboring lots can result in additional enforcement. Contact Community Development at (714) 741-5312.
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