The earliest all-structures Zone 0 in California reaches two feet, and requires no noncombustible fence.

Zone 0 in Contra Costa County: Moraga-Orinda's rule reaches two feet, not five

Fact-checked August 20, 2026·Sources at the end of this article

Two sets of rules, and only one is in force today

Contra Costa is the county the Zone 0 story usually gets wrong. The famous rule and the fence rule are different rules, in different districts.

In force now: Moraga-Orinda Fire District (MOFD) Ordinance No. 23-03, which sets its own date: "This ordinance shall become effective on March 17, 2023." MOFD's elected Board of Directors adopted it, not a city council and not the Board of Supervisors. It binds every parcel in the district, State Responsibility Area and Local Responsibility Area alike, and reaches outbuildings within 100 feet of a structure. Drawing no line between new and existing buildings makes it the earliest Zone 0 ordinance in California to reach all structures, though not the earliest local Zone 0 rule: Ventura County's district reached new buildings from April 1, 2019, and Laguna Beach existing ones from November 5, 2021.

Adopted, not yet in effect: the statewide regulation approved August 19, 2026, still awaiting Office of Administrative Law review and publication by the Secretary of State. Two legal tracks sit underneath it: the State Responsibility Area (SRA), where the state carries financial responsibility for wildfire protection, under Public Resources Code section 4291, and the Local Responsibility Area (LRA), under Government Code section 51182. Their fence texts are not identical. Our timeline and enforcement guide follows the process.

Where the statewide rule will reach in this county

Once effective, the regulation covers the whole SRA whatever the hazard class, plus Very High Fire Hazard Severity Zones inside the LRA. Contra Costa has plenty of both: the Office of the State Fire Marshal's table gives the county 191,471 SRA acres, 68,838 of them Very High, and 72,648 LRA acres, 16,014 of them Very High. Map adoption is uneven. Con Fire and Crockett-Carquinez FPD adopted the updated LRA maps "effective as of July 10, 2025," MOFD designated its zones by Ordinance 25-03, and for San Ramon Valley FPD we found no adopting ordinance.

Concord (79), Brentwood (75) and San Pablo (58) carry small Very High acreages, and six jurisdictions carry none. That does not mean unmapped: the 2025 maps added Moderate and High to the LRA for the first time, and Walnut Creek holds 3,542 High acres, Lafayette 5,309. Those are the state's figures, not a verdict on risk. To place your parcel, use our address lookup walkthrough.

What Moraga-Orinda's Zone 0 actually requires

Ordinance 23-03 defines Zone 0 the way everyone expects, then requires something smaller.

ZONE 0. Referred to as the Ember-resistant Zone or Home Ignition Zone, it extends from 0 to 5 feet from any Structure, attached deck, or Outbuilding on the Parcel. Zone 0 requires the most stringent wildfire fuel reduction.

Moraga-Orinda Fire District Ordinance No. 23-03, definitions

The operative duty, at section 4(b)(1)(A), then reads: "Maintain all ground areas within 2 feet of any Structure or attached deck free of combustible ground cover, including combustible mulch and bark. Hardscape materials, such as gravel, pavers, concrete, and other noncombustible mulch materials are permitted." The plant-clearance and annual-grass clauses use the same two-foot line. Other Zone 0 items run the full five feet or are unbounded: Monterey pines and eucalyptus, firewood and lumber storage, and non-irrigated brush are all prohibited. The City of Orinda republishes the list under the heading "ZONE 0: (0-5 feet)", and its first line is still the two-foot one. For Zone 0 there is no phase-in.

The fence rule in Moraga and Orinda, and what it does not say

This is the paragraph most readers came for. Section 4(e), in full:

Fences. No Person who has any ownership or possessory interest in or control of any Parcel within the Fire District shall construct or allow to be constructed or placed on the Parcel any screen, fence or other Structure made, in whole or in part, of bark, mulch, or wood chips within 100 feet of a Structure or within 10 feet of the paved edge of a Fire Apparatus Access Road.

Moraga-Orinda Fire District Ordinance No. 23-03, section 4(e), in force since March 17, 2023

That bans bark, mulch and wood-chip fencing across a full 100 feet, far wider than Zone 0. It does not require a noncombustible fence anywhere, and it says nothing about a wood board fence in the first five feet, about attached fences, or about gates. MOFD's own summary states it in the same terms, and so does Orinda's republication.

MOFD is candid about this. Listing six recommended steps on its Zone Zero page, the district writes that it "suggests these guidelines based on expert findings, though they are not currently mandatory:" and the first bullet is the full five-foot version, wooden fences included. That version was proposed but never adopted: MOFD's ordinance index, running through Ordinance 26-06, contains no amendment adopting it. Read that page and the district FAQ with care: both are stale on their face, and the FAQ line "The Board has not adopted a Zone Zero requirement" refers to the proposed version, not to Ordinance 23-03, already in force when it was written. Nor does the newer construction code change anything: Ordinance 26-02, adopted January 21, 2026, applies the 2025 California Wildland-Urban Interface Code district-wide, yet contains no whole-word occurrence of "fence", "gate", "Zone 0" or "defensible".

The five-foot fence rule that does exist here, and who it binds

Two of the county's fire jurisdictions adopted materially the same new section 508 in their 2025 Wildland-Urban Interface Code ordinances: SRVFPD Ordinance 2025-41, effective January 1, 2026, and County / Crockett-Carquinez FPD / Con Fire Ordinance 2025-15, operative January 8, 2026. The scope clause is the whole point. Section 508.1 applies to "new residential subdivisions" only, and only where "(a) the subdivision includes 30 or more dwelling units; and (b) any portion of the subdivision is located within or abuts a designated Wildland-Urban Interface Area."

Inside that scope it bites hard. Section 508.2 requires that "All fencing regulated by this section shall be constructed of non-combustible materials, or materials approved for a minimum one-hour fire-resistance rating," counting "fence posts, rails, pickets, panels, post caps, gates, decorative features, and appurtenances" as fencing. Section 508.3 reaches perimeter fencing, fencing within 30 feet of a structure, fencing abutting a Wildland-Urban Interface Area, and "Any fencing located within five feet of a structure... regardless of whether any portion of the lot is located within or adjacent to a Wildland-Urban Interface Area." That one-hour rating is a different test from ASTM E136, the noncombustibility standard the Zone 0 conversation usually runs on. Our guide to noncombustible fence materials leads with aluminum, then steel, wrought iron, chain link, masonry, concrete and stone.

A provenance note. Con Fire's posted copy of Ordinance 2025-15 is a scan whose first four pages carry no text layer, so the section 508 wording above comes from the County's own text copy hosted by the City of Concord, which carries blank signature lines and is therefore pre-adoption. The three codified sections that do appear in the signed scan match that copy verbatim: strong evidence, not the executed instrument.

Con Fire's own ordinance, which we could not read

Lafayette and Walnut Creek are Con Fire territory rather than Moraga-Orinda's, Lafayette's district having merged into Con Fire on January 1, 1969. That one point of geography resolves a lot of bad advice. Con Fire names its defensible-space instrument plainly, as "Contra Costa County Ordinance 2023-07," and posts it as a ten-page image-only scan. Re-tested on August 20, 2026, two extraction tools returned zero characters from all ten pages. We can name the ordinance but cannot quote a word of it, so we do not. The only description we hold is Kensington Fire Protection District's summary handout, which gives 2023-07 an effective date of May 4, 2023 and presents its Zone 0 column and fence entry as identical to MOFD's. That is a third-party summary, so we do not add Con Fire to the count of seven jurisdictions with Zone 0 rules in force. That is a limit on our reading, not a finding that Con Fire has none.

We can rule out a fence duty hiding elsewhere in the county. County Ordinance 2025-14, the 2025 Fire Code adoption, extracted cleanly and contains no occurrence of "Zone 0" or "five feet". SRVFPD's defensible-space ordinance 2023-38 is acreage-based, with no Zone 0 and no fencing requirement. El Cerrito and Kensington define only Zone 1 (to 30 feet) and Zone 2 (30 to 100 feet), never using "Zone 0" or "fence". Richmond inspects without a Zone 0 rule. Both 2025 WUI ordinances let their cities go further, and we found none that has. Our local ordinance tracker lists what we can confirm.

Inspections, escrow, and what no grant here pays for

MOFD holds the sharpest enforcement lever here, and it fires at closing. Section 5 requires that "Before the close of escrow on the sale of any Parcel within the Fire District, the seller shall provide to the buyer documentation from the Fire Code Official stating that the property is currently in compliance with the fuel mitigation requirements of this Ordinance 23-03 and the fuel break requirements of Ordinance 23-04 or its successor ordinance." Mind the successor: MOFD's index shows 23-04 repealed September 20, 2023 and replaced by Ordinance 23-08. Section 6 allows administrative citations, nuisance abatement at the owner's expense and infraction or misdemeanor liability, and the resolution index records the Board upholding a citation issued in July 2025 under 23-03. San Ramon Valley FPD sellers face a different trap: that district's real-estate inspection trigger still runs off "the most recent (11/07/2007) assessment" rather than the 2025 maps. Our Zone 0 checklist follows what an inspector looks at.

On money the pattern is stark: every open program we verified funds vegetation removal, vent mesh, gutter guards or chipping, and none carries a fence or hardscape line item. MOFD's Home Hardening Grant runs "until June 30, 2027," capped at "a maximum of $1,000 per parcel" for ember-resistant vents and sales tax only, and its chipper program answers the question on its own page: "CAN I CHIP WOOD FENCING? No." Fire Safe Moraga-Orinda matches up to $10,000 for groups of five or more properties, vegetation only. Con Fire's Measure X program offers low-income households "up to $1,500 in hazard control or weed abatement work." Kensington's two grant windows closed May 31, 2026, and Diablo Firesafe Council's cost-share has been paused since May 2025. Orinda lists a Measure R incentive whose terms page returns a 404, so we publish no figure; call the City at (925) 253-4220. Our guide to who pays tracks this statewide.

Claims we could not verify

• The text of County Ordinance 2023-07. Its May 4, 2023 effective date, and the claim that its Zone 0 mirrors MOFD's, rest entirely on Kensington FPD's handout.
• Whether section 508 as executed matches the copy we read. A certified copy from the Clerk of the Board would close the gap.
• Whether section 508 binds inside the incorporated cities in Con Fire territory. Ordinance 2025-15 carries no ratification clause, while MOFD's parallel ordinance waits on each city. Ask the building department.
• Hazard-map adoption by San Ramon Valley FPD, El Cerrito, Kensington FPD, Richmond and Pinole. SRVFPD's ordinance index names no adopting instrument and its hazard-zone page gives no date; the others were not found at all.
• The currency of MOFD's two Zone Zero pages. Undated and internally stale, though corroborated by the ordinance text and index.
• The City of Orinda's Measure R award amount and eligible work. The page describing them is a 404.
• Con Fire Ordinance 2026-08 on administrative fines. Listed on Con Fire's ordinance page; we did not open it.
• Whether the 2025 California WUI Code itself contains Zone 0 or fence provisions. We did not obtain the state code text; everything above concerns local amendments.

What this means for you

• In Moraga, Orinda or Canyon, no rule in force requires you to replace a wood fence. Required instead: two feet of noncombustible ground cover, no firewood or lumber in Zone 0, no Monterey pine or eucalyptus, no bark, mulch or wood-chip fencing within 100 feet.
• Selling inside the Moraga-Orinda district? Start early. You need a compliance document from the Fire Code Official before close of escrow.
• Building 30 or more homes in San Ramon Valley FPD or Con Fire territory? Section 508 reaches perimeter fencing, gates, post caps and appurtenances, not just the five feet at the house. Price it at design.
• Everyone else: use the runway rather than the panic. Walk your first five feet with our self-assessment and read what the fence requirements guide will actually ask before you spend anything.
• Do not plan around a grant for fencing. None exists here. Replacing anyway? The detail is in the five-foot transition, and the insurance side, a credit rather than a requirement, in fence insurance discounts.