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C57 Well Drilling License (California)

California has 712 active C57 Well Drilling holders in the state file as of 2026-10-28¹, the 46th-largest of 64 classes with at least 200 holders. 20 of them expire by 2026-12-27.

Active holders: 712; 0.3% of active California licenses
Expiring by 2026-12-27: 20; 2.8% of holders
Median bond on file: $25,000; 711 bonds
Workers' comp exempt: 33.4%; of 712 with WC status

How many C57 contractors are exempt from workers' comp?

238 of 712 active C57 holders with a recorded status (33.4%) filed an exemption¹, against 48.7% across all California classes.

How do you check a C57 license?

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

Other California license classes

ASB Asbestos Certification773
D24 Metal Products809
D64 Non-specialized654
D63 Construction Clean-up849
C4 Boiler, Hot Water Heating and Steam Fitting693
C49 Tree and Palm631
C45 Sign856
C34 Pipeline545

All 64 classes

Sources

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