California Code of Regulations
Title 23 - Waters
Division 3 - State Water Resources Control Board and Regional Water Quality Control Boards
Chapter 26 - Wastewater Treatment Plant Classification, Operator Certification, and Contract Operator Registration
Article 5 - Provisional Operators
Section 3683.3 - Invalidation and Issuance of a New Provisional Operator Certificate

(a) Provisional operator certificates are valid only while the provisional operator is employed at the wastewater treatment plant for which the certificate was issued. When the employment ceases, the owner shall return the certificate to the Office of Operator Certification within 30 days with a statement as to the amount of qualifying experience the provisional operator acquired before employment ceased.

(b) If a provisional operator certificate is returned to the Office of Operator Certification because the provisional operator is no longer employed at the wastewater treatment plant for which the certificate was issued, the provisional operator may apply for a new certificate at any time in accordance with this article, provided the provisional operator held all previous provisional operator certificates for a total of less than 24 months and does not have one year of full-time qualifying experience.