1—Cal Fire has released a long-awaited set of updated maps outlining the fire hazard severity zones in Marin County and elsewhere ... map that uses wildland-urban interface boundaries ...

Cal Fire said the maps are proactive, to be used in wildland-urban interface building standards for new construction and ...

By 2020, there were 1.2 million homes in the WUI, a 27% increase. In some areas, more than 80% of homes are in the WUI: Lake County: 95% Marin ... the map represent very high-risk fire zones.

The WUI is defined by the U.S. Forest Service as the area where human development mixes with and meets natural landscapes. Nearly all modern wildfires in California are ignited by a human source ...