California Code, Health and Safety Code - HSC § 106725

The department shall, upon application therefor and upon payment of the current application and biennial renewal fees, as determined by the department upon the recommendation of the committee by a two-thirds vote, not to exceed one hundred dollars ($100), issue a certificate of registration as an environmental health specialist to any person who holds a certificate of registration as a sanitarian or an environmental health specialist issued by the proper authority of any state or territory, or possession of the United States, if the requirements for the registration of sanitarians or environmental health specialists under which the certificate was issued are consistent with the provisions of this article and at the time the certificate was granted were at least as stringent as those specified in Section 106635.