(a) A firm may not perform hydrostatic testing of fire extinguishers manufactured in accordance with the specifications and procedures of the United States Department of Transportation unless the firm:
(1) complies with the procedures specified by that department for compressed gas cylinders; and
(2) holds a registration certificate issued by the state fire marshal authorizing hydrostatic testing.
(b) The license of an individual qualified to do work described by Subsection (a) must indicate the authority of the individual to perform that work.

(c) Hydrostatic testing of fire extinguishers that is not performed under the specifications of the United States Department of Transportation must be performed in the manner recommended by the National Fire Protection Association.