Grading & Drainage: Irvine vs Midway City
How do grading & drainage rules compare between Irvine, CA and Midway City, CA?
Irvine and Midway City have similar restriction levels.
Irvine, CA
Orange County
Irvine's Grading Code (Title 5, Division 10) establishes comprehensive requirements for grading permits, drainage, and site preparation. Grading permits are required for projects that alter terrain or drainage patterns. Plans must demonstrate proper drainage and prevent increased runoff to neighboring properties. The city reviews grading plans for compliance with engineering standards and conducts inspections during construction.
View full Irvine rules →Midway City, CA
Orange County
The Orange County Grading and Excavation Code (OCCO Title 7, Division 1, Article 8) requires grading permits for all excavation and earthwork in unincorporated areas. Section 7-1-805 prohibits grading, clearing, brushing, or grubbing without a permit from the Building Official. Drainage facilities must conform to Subarticle 11 of the OC Grading Manual.
View full Midway City rules →Key Facts Comparison
| Fact | Irvine | Midway City |
|---|---|---|
| Code Reference | Title 5, Division 10 — Grading Code | - |
| Permit Required | For projects altering terrain or drainage | All grading/excavation/clearing |
| Drainage | No increased runoff to neighbors | - |
| Plan Review | Engineering review required | - |
| Inspections | During and after grading | - |
| Code Section | - | OCCO §7-1-805 through §7-1-811 |
| Drainage Reference | - | OC Grading Manual, Subarticle 11 |
| Blasting Permit | - | OCCO §7-1-808 (OC Fire Authority) |
| Enforcement | - | OC Development Services |
Highlighted rows indicate differences between cities.
Irvine FAQ
Do I need a grading permit in Irvine?
Yes, a grading permit is required for projects that alter terrain or drainage patterns. The city's Grading Code establishes comprehensive requirements for plan review and construction inspections.
Can I change drainage on my Irvine property?
Any changes to drainage patterns require engineering review and a grading permit. You cannot increase stormwater runoff onto neighboring properties.
Midway City FAQ
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.
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