Cal. HSC § 106695

A registered environmental health specialist may maintain registration under a retired biennial registration provided the following requirements are met: (a) Has been a working registered environmental health specialist in California for at least 10 years in an area covered in subdivision (e) of Section 106615, unless receiving an on-the-job disability before the 10 years of service as a registered environmental health specialist has elapsed. (b) Is at least 50 years old or collecting retirement benefits, or both. (c) Not working in a job requiring registration as an environmental health specialist. A person who pays a retired biennial fee shall be registered only as an inactive retired registered environmental health specialist.