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What the ember-resistant zone rules mean for this unincorporated foothill community, under its actual designation and its actual fire authority.
The local snapshot
Portola Hills is where the canyon country meets the suburbs: a master-planned foothill community pressed directly against Whiting Ranch Wilderness Park and the mouth of the canyons. It's mapped Very High in OCFA's territory, and it has evacuated for both of the fires that define this cluster.
Fire record
The Santiago Fire threatened Portola Hills directly in 2007 as it burned 28,445 acres through the canyons and out to the community's edge, and the Bond Fire's December 2020 evacuations reached Portola Hills again. A modern suburban street grid doesn't change the physics: embers travel from the wildland into fence lines, mulch beds, and vents. The first five feet around each home, the ember-resistant Zone 0, is where that chain gets broken.
Who enforces it
OCFA is the Authority Having Jurisdiction here. Statewide Zone 0 is Proposed — not in force. Existing defensible-space law still applies. OCFA Guideline C-05 is a new-construction fuel-modification plan-review rule, not a countywide existing-home Zone 0 ordinance. Deadlines pages carry local status labels, not a 2027 to 2028 statewide clock; your jurisdiction sets the specifics, and this page names yours. For the requirements themselves, start with the regulations guide, fences and gates, and landscaping.
Questions
Yes. Portola Hills is mapped Very High. Its position against Whiting Ranch and the canyon mouths puts suburban streets in the direct path of wind-driven embers, which is why it evacuated in both 2007 and 2020.
The same first-five-feet standard: no combustible fencing or gates attached to the structure, no bark mulch at the foundation, no stored combustibles in the ring. Newer construction often needs less structural work but still commonly fails on fences and mulch.
OCFA, which serves this unincorporated community and the adjacent canyon country.
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