The most recent incidents were during a period of high fire danger on Sunday in San Ramon and Monday in Las Trampas Regional Wilderness. The first fire burned 7 acres and injured one firefighter. The second fire burned 6 acres near that same location.
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Investigators working with the San Ramon Police Department identified 39-year-old William Priest at his home Monday evening. He's been booked into county jail on $75,000 bail.
Another suspect who has not been identified was arrested in two previous arson wildfires, according to the San Ramon Valley Fire Protection District.
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A two-alarm fire burned 4 acres and threatened homes in Danville on Aug. 28. One firefighter was injured, and Danville police arrested a suspect on suspicion of recklessly starting that fire. Two weeks later, that suspect was arrested a second time for starting a fire in the Blackhawk area on Sept. 16.
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