Residents in western Goleta noticed something odd this weekened: an unusual, unpleasant odor.
It's unclear if the odor is an active natural seep of hydrogen sulfide or an industrial problem.
County officials have also been looking into a possible connection to a well drilling project on an Ellwood ranch.
One homeowner voluntarily evacuated due to health concerns.
Numerous calls have come in from that area and nearby in Winchester Canyon.
Several agencies have gotten involved, including the Santa Barbara County Health Department, the Air Pollution Control District, the Fire Department, and the City of Goleta itself.