Cal. Health & Saf. Code § 115185
If the department determines that any object, building, structure, or premises is contaminated by radioactive material and constitutes a hazard to the public health, it shall order the person who has control of the object, building, structure, or premises to cease to use or occupy and to exercise due caution to prevent others from using or occupying the object, building, structure, or premises, except to the extent necessary to accomplish the decontamination, or to the extent necessary to accomplish the disposal of the object, building, or structure as radioactive waste. The normal use or occupancy of the object, building, structure, or premises may not be resumed until decontamination has been accomplished and a release obtained from the department.
If the person who has control of the object, building, structure, or premises fails to comply with the department's order to decontaminate, the department may impound or seize the object, building, structure, or premises. The department after impounding or seizure of an object, building, structure, or premises, may decontaminate the object, building, structure, or premises.
Ca. Health and Saf. Code § 115185