What causes wildfires in San Diego County?

Cal Fire reported 974 wildfires under its jurisdiction within San Diego County from 2019 through 2023. Here are the causes that Cal Fire determined for those fires.

Cal Fire updated its category names in 2023; the old names are used here. "Equipment" includes mechanical or electrical equipment, but not electrical utility equipment. "Electric power" includes power generation, transmission or distribution equipment. "Playing with fire" refers to misuse of fire by a minor, "campfire" includes ceremonial fires and "other" is a catch-all for other causes.
Source: Cal Fire Wildfire Activity Statistics Reports
Kristen Taketa / The San Diego Union-Tribune