(a) The commission by rule shall establish a program to certify persons qualified to install, exchange, service, and repair residential, commercial, or industrial water treatment equipment and appliances.
(b) The rules must establish:
(1) standards for certification to ensure the public health and to protect the public from unqualified persons engaging in activities relating to water treatment;
(2) classes of certification;
(3) duration of certification; and
(4) reasonable annual certification fees in an amount sufficient to pay the administrative costs of the certification program, but not to exceed $150 a year for any class of certification.