All individuals who operate or supervise the operation of a drinking water treatment facility must possess a water treatment operator certificate. The T1 (Treatment 1) certificate exam can be completed as long as you have obtained a high school diploma or GED.

Minimum Requirements for T1 Examination
High School Diploma or GED

Requirements for Certification
Successful completion of the T1 Exam

Expected Range of Knowledge

Exam Schedule
Treatment exams are offered twice a year in May and November. The final filing date for the May exam is March 1 and the final filing date for the November exam is September 1.

Exam Application

More information can be found at the California State Water Resources Control Board site at