Cal. Gov. Code § 84252
A committee primarily formed to support or oppose a LAFCO proposal shall file all statements required under this chapter except that, in lieu of the statements required by Sections 84200 and 84202.3, the committee shall file monthly campaign statements from the time circulation of a petition begins until a measure is placed on the ballot or, if a measure is not placed on the ballot, until the committee is terminated pursuant to Section 84214. The committee shall file an original and one copy of each statement on the 15th day of each calendar month, covering the prior calendar month, with the clerk of the county in which the measure may be voted on. If the petition results in a measure that is placed on the ballot, the committee thereafter shall file campaign statements required by this chapter.
Ca. Gov. Code § 84252