No where near San Andreas fault, which lies off the coast in the Pacific. More likely it's the nearby Mt. Konocti volcano, which is dormant. Underground geothermal vents in the region may be venting towards the direction of the subdivision. Gas & electric utilities north of San Francisco get much of their electricity generation from geothermal. Before my wife retired from PG&E, she had to visit geothermal plants near volcano ranges in northern California, and said the vents are quite active (stinking of sulfur). PG&E was forced to sell off their geothermal generation a few years back. These volcanos are dormant, but not dead.
Mud pots, fumaroles, steam vents and hot springs are very active further north at Lassen.