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C42 Sanitation System License (California)

California has 962 active C42 Sanitation System holders in the state file as of 2026-10-28¹, the 41st-largest of 64 classes with at least 200 holders. 37 of them expire by 2026-12-27.

Active holders: 962; 0.4% of active California licenses
Expiring by 2026-12-27: 37; 3.8% of holders
Median bond on file: $25,000; 961 bonds
Workers' comp exempt: 34.8%; of 962 with WC status

How many C42 contractors are exempt from workers' comp?

335 of 962 active C42 holders with a recorded status (34.8%) filed an exemption¹, against 48.7% across all California classes.

How do you check a C42 license?

Search by license number or business name on the California license lookup, which reads the same state file.

Other California license classes

C5 Framing and Rough Carpentry1,036
C45 Sign856
D21 Machinery and Pumps1,042
D63 Construction Clean-up849
C23 Ornamental Metal1,067
D24 Metal Products809
C60 Welding1,077
ASB Asbestos Certification773

All 64 classes

Sources

CA CSLB License Master (cslb.ca.gov data portal) (cslb.ca.gov, 2026-10-28)