Grading & Drainage: Costa Mesa vs Midway City

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.

Do I need a grading permit in unincorporated Orange County?

Yes. Under OCCO §7-1-805, all grading, clearing, brushing, and grubbing activities require a grading permit from the Building Official. This includes excavation, fill placement, and earthwork on private property.

What drainage requirements apply to grading in unincorporated Orange County?

Drainage facilities must conform to Subarticle 11 of the OC Grading Manual. Finished surfaces must direct water away from structures toward approved drainage facilities, and precise grading plans must show drainage patterns and connections to the public storm drain system.