Streets and Highways Code § 19282
CHAPTER 15.5. Dissolution Upon Annexation to Maintenance District or Establishment of a County Service Area, a Community Services District, or a City
The dissolution shall be effective upon the filing with the State Board of Equalization and the county assessor of a copy of the resolution of the board of supervisors declaring the district dissolved, or on such later date as may be fixed by the board of supervisors in such resolution.