Neb. Rev. Stat. § 38-1310

(1) Certification as a registered environmental health specialist shall expire biennially. Certification as a provisional environmental health specialist shall be valid for one year and may be renewed for two additional one-year periods. In no case shall certification for a provisional environmental health specialist exceed a three-year period. (2) Each registered environmental health specialist in active practice in the state shall complete continuing competency activities as approved by the board and adopted and promulgated by the department in rules and regulations as a prerequisite for the registrant's next subsequent biennial renewal. Continuing education is sufficient to meet continuing competency requirements. The requirements may also include, but not be limited to, one or more of the continuing competency activities listed in section 38-145 which a registered environmental health specialist may select as an alternative to continuing education.