This is not a Natural Hazard Disclosure statement. Open state data, explained; flood and dam zones are not covered. Details
Is Antioch in a fire hazard severity zone?
26.4% of Antioch is mapped in a fire hazard severity zone, and 23.4% in High or Very High, where the seller disclosures apply.
Antioch ranks 775 of 1050 California places for the share of land in High or Very High zones.
In land area, that is 1.34 sq mi Very High, 5.66 sq mi High, 0.91 sq mi Moderate, out of 29.93 sq mi. Its High and Very High share of 23.4% is 24.6 points below the 48.0% of Contra Costa County. The median home value of $607,400 is 27% below the county median of $830,800. Among 53 places in the county it ranks 20 for exposure; Port Costa ranks first at 100.0%. The latest recorded fire is SOMERSVILLE in 2025. By decade: 1970s: 1, 2000s: 2, 2020s: 4. Seismic maps cover Antioch with liquefaction 35.9%, landslide 3.1%.
Zones differ from street to street: check the address above. In Contra Costa County overall, 17.4% of the land is Very High.
Fires recorded in or across Antioch
The state record shows 7 since 1950. The largest was BLACK DIAMOND PEAK in 1979 (681 acres in total).
- SOMERSVILLE (2025), 358 acres
- WILBUR (2024), 2 acres
- SARDIS (2024), 11 acres
- SARDIS 2 (2024), 5 acres
- CON ASST 13_DIAMOND (2005), 163 acres
- CON ASSIST 11_DOLAN (2005), 78 acres
- BLACK DIAMOND PEAK (1979), 681 acres
Nearby places compared
- Brentwood, 5.3 mi southeast: 7.4% High or Very High, 1 fire, median home $791,600
- Oakley, 5.7 mi east: 0.0% High or Very High, 0 fires, median home $632,800
- Pittsburg, 5.9 mi northwest: 16.2% High or Very High, 5 fires, median home $583,100
- Clayton, 7.8 mi west: 67.6% High or Very High, 0 fires, median home $1,017,300
- Knightsen, 7.9 mi east: 0.0% High or Very High, 0 fires, median home $861,100
- Bethel Island, 9.2 mi northeast: 0.0% High or Very High, 0 fires, median home $549,500
- Bay Point, 9.8 mi northwest: 18.8% High or Very High, 3 fires, median home $479,100
- Byron, 11.1 mi southeast: 3.5% High or Very High, 0 fires, median home $862,200
- Concord, 11.2 mi west: 7.7% High or Very High, 0 fires, median home $755,900
- Discovery Bay, 11.8 mi east: 0.0% High or Very High, 0 fires, median home $789,400
- North Gate, 12.1 mi southwest: 88.0% High or Very High, 0 fires, median home $1,732,100
- Blackhawk, 12.7 mi southwest: 48.1% High or Very High, 2 fires, median home $1,948,900