What insurance does a C-34 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; Heavy equipment.

How many C-34 contractors are there in California?

534 active licences hold the C-34 classification as of 2026-09-06; 378 (71%) have workers' comp on file and 136 are exempt.

When do C-34 workers' comp policies renew?

100 renew within 90 days. October is the peak month.

Which WCIRB class codes apply to C-34 work?

Most often 6306 (Sewer construction / pipeline). The WCIRB assigns the class from the actual operations and payroll, so verify per account in the WCIRB classification search.

CSLB classification · Plumbing

C-34 Pipeline Contractor

Name: C-34 Pipeline Contractor: California licence and insurance statistics
Creator: Birdray
License: https://creativecommons.org/licenses/by/4.0/

Installs pipelines for gas, oil, water and sewage.

534

Active licences

378

With workers' comp

71%

100

Renewing in 90 days

Lapsed or suspended

136

Exempt

New in 90 days

Coverages a producer should expect

›Workers' comp
›General liability
›Pollution
›Heavy equipment

WCIRB classes usually assigned

6306 Sewer construction / pipeline

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-34 workers' comp renewals by month, California

Sep

Oct

Nov

Dec

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Counties with the most

Related classes in Plumbing

C-36 Plumbing Contractor C-42 Sanitation System Contractor C-55 Water Conditioning Contractor

Frequently asked

What does a C-34 licence allow a contractor to do?: Installs pipelines for gas, oil, water and sewage.
What insurance does a C-34 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; Heavy equipment.
How many C-34 contractors are there in California?: 534 active licences hold the C-34 classification as of 2026-09-06; 378 (71%) have workers' comp on file and 136 are exempt.
When do C-34 workers' comp policies renew?: 100 renew within 90 days. October is the peak month.
Which WCIRB class codes apply to C-34 work?: Most often 6306 (Sewer construction / pipeline). The WCIRB assigns the class from the actual operations and payroll, so verify per account in the WCIRB classification search.

Selling to C-34 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 →