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What the ember-resistant zone rules mean for this unincorporated canyon community, under its actual designation and its actual fire authority.
The local snapshot
Williams Canyon branches off Santiago Canyon Road between Silverado and Modjeska, a small community with the same exposure profile as its better-known neighbors: one access road, steep fuel-loaded slopes, and a Very High designation in OCFA's Local Responsibility Area. Statewide Zone 0 is Proposed — not in force; the first five feet is Recommended now.
Fire record
When the Bond Fire spread from Silverado in December 2020, Williams Canyon was among the communities ordered out. The 2007 Santiago Fire had moved through this same stretch of the canyons thirteen years before. Small community, repeat exposure: the ember-resistant zone is the piece of wildfire defense each individual property here controls.
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. It's unincorporated Very High territory in OCFA's jurisdiction. Existing defensible-space law still applies. Statewide Zone 0 is Proposed — not in force. The first five feet is Recommended now.
Yes. Williams Canyon was within the Bond Fire evacuation zone in December 2020 as the fire spread through the canyon corridor from Silverado.
OCFA, which serves all of the unincorporated Santa Ana Mountain communities and runs the local inspection and hazard-reduction programs.
Submit your address and we will follow up about which local rules apply to your parcel, what your fire authority will look for, and what an inspection would document.
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