Cal. Education Code § 44929.23

(a) The governing board of a school district of any type or class having an average daily attendance of less than 250 pupils may classify as a permanent employee of the district any employee who, after having been employed by the school district for three complete consecutive school years in a position or positions requiring certification qualifications, is reelected for the next succeeding school year to a position requiring certification qualifications. If that classification is not made, the employee shall not attain permanent status and may be reelected from year to year thereafter without becoming a permanent employee until a change in classification is made. (b) Notwithstanding subdivision (a), Section 44929.21 shall apply to certificated employees employed by a school district, if the governing board of the school district elects to dismiss probationary employees pursuant to Section 44948.2. If that election is made, the governing board thereafter shall classify as a permanent employee of the district any probationary employee who, after being employed for two complete consecutive school years in a position or positions requiring certification qualifications, is reelected for the next succeeding school year to a position requiring certification qualifications as required by Section 44929.21. Any probationary employee who has been employed by the district for two or more consecutive years on the date of that election in a position or positions requiring certification qualifications shall be classified as a permanent employee of the district. (c) If the classification is not made pursuant to subdivision (a) or (b), the employee shall not attain permanent status and may be reelected from year to year thereafter without becoming a permanent employee until the classification is made.