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Zone Zero in Mission Viejo: expanded Very High zones in 2025

What the ember-resistant zone rules mean for this city, under its actual designation and its actual fire authority.

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Quick answer: Mission Viejo carries a Very High designation, with Orange County Fire Authority (OCFA) as the local fire authority. Statewide Zone 0 is Proposed — not in force. Existing defensible-space law still applies. The first five feet is Recommended now. There is no statewide combustible-fence clock.

The local snapshot

Where Mission Viejo stands

Mission Viejo's Very High zones are real and, under the 2025 remap, larger: the city council's own adoption notice references local changes to the Very High severity zones and the addition of High zones. The hillside edges facing open space carry the designation; Zone Zero (Zone 0) applies within those mapped areas rather than blanketing the whole city.

Very High
zones expanded in the 2025 remap
High
tier newly added per the city's adoption notice
Open space
the designated areas track the city's wildland edges
OCFA
the city's fire authority

Fire record

Designated by geography, not by one fire

Mission Viejo has no single defining fire in this project's verified record, and this page won't invent one. Its designation comes from geography: canyon-adjacent slopes and open-space edges in a county whose fires, from the Santiago Fire to the 2024 Airport Fire, keep demonstrating how wind-driven embers travel into exactly this kind of terrain. Check your parcel against the city's adopted map before assuming either way.

Who enforces it

Orange County Fire Authority (OCFA)

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

Quick answers

Does Mission Viejo have Very High fire hazard zones?

Yes. Confirmed Very High zones exist and were expanded in the 2025 remap; the city's own adoption notice references local changes to the Very High zones and newly added High zones.

Does Zone Zero apply to every Mission Viejo home?

No. It applies to parcels within the mapped Very High zones, which track the city's hillside and open-space edges. Check your specific parcel on the city's adopted map or check your address.

Which fire authority serves Mission Viejo?

OCFA, which applies the state Zone 0 framework locally for the city.

Find out what your Mission Viejo property needs

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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