Cal. Elections Code § 1415

(a) (1) Except as provided in paragraph (2), a city or city and county charter proposal proposed by the governing body of a city or city and county on its own motion that qualifies pursuant to Section 9255 shall be submitted to the voters at the next established statewide general election pursuant to Section 1200 occurring not less than 88 days after the date of the order of election. (2) The governing body of a city or city and county may direct that either of the following be submitted to the voters at the next regularly scheduled general municipal election pursuant to Section 1301, or at any established statewide general or statewide primary election pursuant to Section 1200 or 1201, occurring not less than 88 days after the date of the order of election: (A) A charter proposal that proposes to amend a charter in a manner that does not alter any procedural or substantive protection, right, benefit, or employment status of any local government employee or retiree or of any local government employee organization. (B) A charter proposal that proposes to amend a charter solely to comply with a court injunction or consent decree or with federal or state voting rights laws. (b) A city or city and county charter proposal that proposes to amend or repeal a charter and is proposed by a petition signed by 15 percent of the registered voters of a city or 10 percent of the registered voters of a city and county, pursuant to subdivision (c) of Section 9255, shall be submitted to the voters at the next regularly scheduled general municipal election pursuant to Section 1301, or at any established statewide general or statewide primary election pursuant to Section 1200 or 1201, occurring not less than 88 days after the date of the order of election.