Wildfire Zones: Mission Viejo vs Santa Ana
How do wildfire zones rules compare between Mission Viejo, CA and Santa Ana, CA?
Santa Ana has fewer restrictions than Mission Viejo.
Mission Viejo, CA
Orange County
Portions of Mission Viejo along the eastern and southern hillside edges are designated as Very High Fire Hazard Severity Zones by CAL FIRE and OCFA. Properties in these zones must maintain 100 feet of defensible space, use fire-resistant building materials, and comply with OCFA vegetation management inspection programs. Annual brush clearance is required before fire season.
View full Mission Viejo rules →Santa Ana, CA
Orange County
Santa Ana is a fully urbanized city with no areas designated as Very High Fire Hazard Severity Zones (VHFHSZ) by CAL FIRE. The city is served by the Orange County Fire Authority (OCFA) and is not subject to wildland-urban interface fire regulations.
View full Santa Ana rules →Key Facts Comparison
| Fact | Mission Viejo | Santa Ana |
|---|---|---|
| Defensible Space | 100 feet required from structures | - |
| Zone 1 Clearance | 0–30 feet, remove all combustibles | - |
| Inspections | Annual OCFA vegetation management checks | - |
| Building Materials | Class A roof, fire-resistant per CBC Ch. 7A | - |
| Inspection Period | April through June annually | - |
| VHFHSZ Areas | - | None in Santa Ana |
| Fire Service | - | Orange County Fire Authority |
| Responsibility Area | - | Local (LRA) |
| WUI Requirements | - | Not applicable |
| Standard Fire Code | - | Still enforced |
Highlighted rows indicate differences between cities.
Mission Viejo FAQ
Is my Mission Viejo property in a wildfire hazard zone?
Properties along the eastern hillsides near Trabuco Canyon and areas near Oso Parkway may be in a Very High Fire Hazard Severity Zone. Check the CAL FIRE hazard severity zone map or contact OCFA Community Risk Reduction at (714) 573-6000 for your specific address.
What does defensible space clearance require?
Within 30 feet of your home, remove all dead vegetation, dry leaves, and combustible materials. From 30 to 100 feet, reduce and space vegetation to slow fire spread. Trees should be limbed up 6 feet from the ground and spaced so canopies do not touch.
When does OCFA inspect for brush clearance?
OCFA typically conducts vegetation management inspections from April through June. Property owners in designated zones receive written notices with a compliance deadline. Contact OCFA at (714) 573-6000 if you have questions about your inspection schedule.
Santa Ana FAQ
Is Santa Ana in a wildfire zone?
No. Santa Ana is a fully urbanized city with no areas designated as Very High Fire Hazard Severity Zones by CAL FIRE.
Do I need special fire-resistant building materials in Santa Ana?
The enhanced WUI building material requirements do not apply in Santa Ana since the city has no VHFHSZ areas. Standard California Building Code fire protection requirements still apply.
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