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C36 Plumbing License (California)
California has 17,646 active C36 Plumbing holders in the state file as of 2026-10-281, the 3rd-largest of 64 classes with at least 200 holders. 591 of them expire by 2026-12-27.
- Active holders
- 17,646
- 7.5% of active California licenses
- Expiring by 2026-12-27
- 591
- 3.3% of holders
- Median bond on file
- $25,000
- 17,644 bonds
- Workers' comp exempt
- 50.8%
- of 17,646 with WC status
What does the California Plumbing license require?
C-36 Plumbing Contractor (water supply, waste, gas piping, water heaters, backflow, utility connections).2
Exam
Two exams: (1) Law & Business and (2) trade exam for the classification (no trade exam for C-61).3
Bond
$25,000 contractor bond (or $25,000 cashier's check).1
How many C36 contractors are exempt from workers' comp?
8,959 of 17,646 active C36 holders with a recorded status (50.8%) filed an exemption1, against 48.7% across all California classes.
How do you check a C36 license?
Search by license number or business name on the California license lookup, which reads the same state file.
Other California license classes
Sources
- CA CSLB License Master (cslb.ca.gov data portal) (cslb.ca.gov, 2026-10-28)
- Contractors State License Board (CSLB): classes (cslb.ca.gov)
- Contractors State License Board (CSLB): exam (cslb.ca.gov)