California has the most complex drone spray licensing stack in the US, administered by CDPR (California Department of Pesticide Regulation, under CalEPA).
Operators need: (1) FAA Part 107, (2) FAA Part 137, (3) CDPR Unmanned Pest Control Aircraft Pilot Certificate (Apprentice or Journeyman tier, entirely separate from manned aircraft certification) and (4) a Qualified Applicator Certificate (QAC) for individuals or Qualified Applicator License (QAL) for business owners.
The Pilot Certificate has two tiers. Apprentice requires passing CDPR written and practical exams. Journeyman requires additional experience hours and a more advanced practical. Fee is $265 application plus $115 per exam at 70% passing score.
County Agricultural Commissioner registration is required in each county where you operate, not just your home county. Restricted Material Permits must be obtained before each application where applicable. Some restricted materials also require same-day Notice of Intent filing.
Every pesticide application must be reported to the County Agricultural Commissioner. This statewide reporting requirement adds significant administrative overhead per job and is unique to California.
Renewal is on a 2-year cycle. California does not participate in reciprocal licensing with other states.