Aliso Viejo, CA Fire Regulations: Wildfire Zones (2026)

Aliso Viejo's wildfire rules are spread across the fire code amendments in AVMC 13.04.030 and the Wildland-Urban Interface Code amendment in AVMC 13.02.130. Section 327.2 governs work during any time of the year within Wildfire Risk Areas, within or immediately adjacent to forest- or brush-covered land or non-irrigated grass-covered land. No person shall use welding equipment, cutting torches, tar pots, grinding devices or other tools that produce a spark, fire or flame that could result in a wildfire unless four conditions are met. First, flammable material, including snags, is cleared for 30 feet around the operation, or an alternative method is approved by the AHJ before work starts. Second, one serviceable round point shovel with an overall length of not less than 46 inches and one backpack pump water-type fire extinguisher stay ready at the work area. Third, work stops when winds reach 8 MPH or greater with relative humidity under 25%, on a red flag condition or public announcement, when the Fire Code Official has an official sign posted, or when the work presents a hazard. Fourth, a cell phone stays nearby to call 911 in case of fire.

Engines are covered by Section 327.1: no person shall operate an internal combustion engine using hydrocarbon fuels in, upon or adjoining any hazardous fire area unless it has a spark arrester, as defined in Section 202, kept in effective working order. Exceptions cover truck, bus and passenger vehicle engines (not motorcycles) with a muffler, and certain turbocharged engines. Section 327.3 bars mounting spark arresters so flames or heat could ignite flammable material.

Building and burning rules follow the same map. Under Section 602.4 in AVMC 13.02.130, the Orange County Fire Authority reviews and approves fuel modification plans for all new buildings in a wildfire risk area against OCFA Guideline C-05. Wood and solid fuel fires in devices other than permanent fireplaces are not allowed within Wildfire Risk Areas and adopted Fire Hazard Severity Zones (Section R1001.14.3, AVMC 13.02.120). AVMC 15.50.010 separately applies fuel modification rules to areas in a very high fire hazard severity zone.