California Backflow Tester Certification Requirements: 2026 Guide
California backflow tester certification explained: recognized certification organizations, 2026–2027 transition, local acceptance and testing rules.
Browse the available California guides. Coverage differs by occupation; check the scope and source links on each page before using a requirement.
Use the License Finder →California Trade License Requirements
California Electrician License Requirements: Complete 2026 Guide
California electrician licensing explained: DIR certification, trainee registration, required hours, exams, C-10 contractor licensing, fees, bonds and renewal.
California Fire Alarm Technician Certification Requirements: 2026 Guide
California Fire/Life Safety Technician certification explained: 4,000-hour or NICET route, exam, fees, C-10 employment and renewal.
California Home Inspector License Requirements: 2026 Guide
California home inspector requirements explained: no state license, statutory duties, conflicts of interest, reports, insurance and voluntary credentials.
California HVAC Contractor License Requirements: Complete 2026 Guide
California HVAC contractor licensing explained: C-20 scope, four-year experience rule, exams, fees, $25,000 bond, workers’ compensation and EPA certification.
California Low Voltage Contractor License Requirements: 2026 C-7 Guide
California C-7 low-voltage contractor licensing explained: 91-volt scope, exclusions, experience, exams, fees, bond and renewal.
California Plumbing Contractor License Requirements: 2026 C-36 Guide
California C-36 plumbing contractor licensing explained: scope, experience, exams, fees, bond, insurance, renewal and reciprocity.
California Septic Installer License Requirements: 2026 C-42 Guide
California septic installer licensing explained: C-42 scope, alternative classifications, experience, exams, fees, bond and county permits.
California Solar Contractor License Requirements: 2026 C-46 Guide
California C-46 solar contractor licensing explained: thermal and photovoltaic scope, C-10 overlap, experience, exams, fees, bond and renewal.
California Water Well Driller License Requirements: 2026 C-57 Guide
California C-57 water-well drilling license explained: scope, four-year experience, exams, fees, bond, local permits and completion reports.