Grading & Drainage: Costa Mesa vs Garden Grove

When do I need a grading permit in Costa Mesa?

Most grading, excavation, and fill operations require a grading permit. Minor fills less than one foot deep on gentle slopes under 50 cubic yards, and landscape planter fills less than three feet deep under 50 cubic yards, may be exempt if they do not obstruct drainage courses.

Can I change the drainage on my Costa Mesa property?

You must not alter grades in a way that causes water to flow onto neighboring lots. All grading must direct drainage away from buildings and toward approved drainage facilities. A grading plan prepared by a licensed civil engineer may be required.

What happens if I grade without a permit in Costa Mesa?

Grading without a permit can result in a stop-work order, double permit fees as a penalty, and administrative citations from Code Enforcement. Contact Development Services at (714) 754-5245 before starting any grading work.

When do I need a grading permit in Garden Grove?

A grading permit is required when excavation or fill work exceeds approximately 50 cubic yards. Smaller projects may be exempt but must still maintain proper drainage. Contact Community Development at (714) 741-5312 to confirm your project requirements.

Can my grading project direct water onto a neighbor's property?

No. All grading must maintain proper drainage patterns and direct stormwater to approved outlets such as streets or storm drains. You cannot alter the grade of your property in a way that causes water to flow onto adjacent lots.

Do I need an engineer for grading work in Garden Grove?

Yes, grading plans for permitted projects must typically be prepared by a California-licensed civil engineer. The plans must show existing and proposed contours, drainage patterns, erosion controls, and any retaining wall details.