California Code, Streets and Highways Code - SHC § 25034

The Secretary of State shall furnish and transmit to the clerk of the board of supervisors of the county adopting the initial resolution for the organization of the district a certificate of organization of the district. Within 10 days after the receipt of the certificate, the clerk shall notify (a) the clerks of the several boards of supervisors of the counties constituting the district, (b) thestate Director of Transportation, and (c) each supervisor appointed as a member of the board of directors of the district that the district has been organized.