What insurance does a C-57 contractor need?

Workers' compensation is required by law once they have employees; the CSLB suspends a licence without it. Beyond that, producers usually place: Workers' comp; General liability; Pollution; Equipment.

How many C-57 contractors are there in California?

707 active licences hold the C-57 classification as of 2026-09-06; 447 (63%) have workers' comp on file and 240 are exempt.

When do C-57 workers' comp policies renew?

96 renew within 90 days. January is the peak month.

Which WCIRB class codes apply to C-57 work?

Most often 6204 (Drilling NOC). The WCIRB assigns the class from the actual operations and payroll, so verify per account in the WCIRB classification search.

CSLB classification · Well Drilling

C-57 Well Drilling Contractor

Name: C-57 Well Drilling Contractor: California licence and insurance statistics
Creator: Birdray
License: https://creativecommons.org/licenses/by/4.0/

Drills water wells and installs pumps.

707

Active licences

447

With workers' comp

63%

Renewing in 90 days

Lapsed or suspended

240

Exempt

New in 90 days

Coverages a producer should expect

›Workers' comp
›General liability
›Pollution
›Equipment

WCIRB classes usually assigned

6204 Drilling NOC

Governing class depends on actual operations and payroll. Verify with the WCIRB classification search before quoting.

Carriers writing this class

Policies on file, statewide

C-57 workers' comp renewals by month, California

Sep

Oct

Nov

Dec

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Counties with the most

Frequently asked

What does a C-57 licence allow a contractor to do?: Drills water wells and installs pumps.
What insurance does a C-57 contractor need?: Workers' compensation is required by law once they have employees; the CSLB suspends a licence without it. Beyond that, producers usually place: Workers' comp; General liability; Pollution; Equipment.
How many C-57 contractors are there in California?: 707 active licences hold the C-57 classification as of 2026-09-06; 447 (63%) have workers' comp on file and 240 are exempt.
When do C-57 workers' comp policies renew?: 96 renew within 90 days. January is the peak month.
Which WCIRB class codes apply to C-57 work?: Most often 6204 (Drilling NOC). The WCIRB assigns the class from the actual operations and payroll, so verify per account in the WCIRB classification search.

Selling to C-57 contractors in California?

Birdray runs signal-timed outbound for one agency per territory: the companies behind these numbers, the person to email, and the renewal date, sent from your inbox. The database is free to search.

How the outbound works Search free

Sources: CSLB licence and workers' compensation records, California Secretary of State, OSHA, FMCSA, county permits. Aggregates only; no individual contractor appears on this page. "Active" means a CLEAR licence status. Renewal counts include policies on file with the CSLB expiring in the window. Refreshed weekly; this page as of 2026-09-06. Every field and its source →