Wildfire Zones: Irvine vs Midway City
How do wildfire zones rules compare between Irvine, CA and Midway City, CA?
Irvine has fewer restrictions than Midway City.
Irvine, CA
Orange County
Irvine adopted updated Fire Hazard Severity Zone maps in 2025, expanding Moderate, High, and Very High designations into multiple communities. Properties in FHSZ areas face enhanced building standards and defensible space requirements.
View full Irvine rules →Midway City, CA
Orange County
Unincorporated Orange County contains extensive Very High Fire Hazard Severity Zones (VHFHSZ) as designated by CAL FIRE and adopted by the Board of Supervisors via Ordinance No. 25-015. Canyon and hillside communities face the strictest building and vegetation management requirements.
View full Midway City rules →Key Facts Comparison
| Fact | Irvine | Midway City |
|---|---|---|
| FHSZ Map | Updated 2025, effective July 2025 | - |
| Zones | Moderate, High, Very High | Very High, High, Moderate |
| Expanded Areas | 8+ communities added | - |
| Building Code | CBC Chapter 7A in VHFHSZ | CBC Ch. 7A / CRC R327 |
| Defensible Space | 100 ft required in FHSZ | - |
| Ordinance | - | No. 25-015 (Aug 2025) |
| Disclosure Required | - | CC §1103 NHD Statement |
| VHFHSZ Areas | - | Canyon communities |
Highlighted rows indicate differences between cities.
Irvine FAQ
Is my Irvine home in a wildfire zone?
Check the city's Fire Hazard Severity Zone Map. The 2025 update expanded zones into Orchard Hills, Woodbury, Portola Springs, Quail Hill, Turtle Rock, and other communities.
What building requirements apply in fire zones?
Properties in Very High FHSZ must meet CBC Chapter 7A standards for ignition-resistant construction, including Class A roofing and fire-resistant walls.
Midway City FAQ
Is my unincorporated Orange County property in a wildfire zone?
Check the OC Fire Hazard Severity Zones Map adopted under Ordinance No. 25-015. Most canyon and hillside communities (Trabuco Canyon, Silverado, Modjeska, Santiago Canyon) are classified as Very High Fire Hazard Severity Zones.
What building requirements apply in Orange County wildfire zones?
Properties in Very High Fire Hazard Severity Zones must use fire-resistive construction per California Building Code Chapter 7A, including ignition-resistant materials, ember-resistant vents, and fire-rated roofing.
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