(a) The department shall issue a certificate of registration as a professional sanitarian to a person who:
(1) applies in the manner and on the form prescribed by the executive director;
(2) pays the registration fee set by the commission by rule;
(3) meets the eligibility requirements prescribed by Section 1953.102; and
(4) passes an examination under Subchapter D.
(b) A certificate of registration is valid for two years.