California Code, Health and Safety Code - HSC § 13190.3

(a) The owner or occupant of a property in which fire extinguishers are located shall be responsible for the inspection, maintenance, and recharging of the fire extinguishers.

(b) Maintenance, servicing, and recharging shall be performed by concerns licensed by the State Fire Marshal having available the appropriate servicing manual, the proper types of tools, recharge materials, lubricants, and manufacturer's recommended replacement parts or parts of equal quality.