Cal. Gov't Code § 3540.1
As used in this chapter:
(i) “Organizational security” is within the scope of representation, and means either of the following:
(k) “Public school employer” or “employer” means the governing board of a school district, a school district, a county board of education, a county superintendent of schools, a charter school that has declared itself a public school employer pursuant to subdivision (b) of Section 47611.5 of the Education Code, an auxiliary organization established pursuant to Article 6 (commencing with Section 72670) of Chapter 6 of Part 45 of Division 7 of Title 3 of the Education Code, except an auxiliary organization solely formed as or operating a student body association or student union, or a joint powers agency, except a joint powers agency established solely to provide services pursuant to Section 990.8, if all the following apply to the joint powers agency:
(3) Any of the following are true: