Birdray

CSLB classification · Plumbing

C-42 Sanitation System Contractor

Installs septic and sewage systems.

960
Active licences
590
With workers' comp
61%
168
Renewing in 90 days
11
Lapsed or suspended
330
Exempt
8
New in 90 days

Coverages a producer should expect

  • ›Workers' comp
  • ›General liability
  • ›Pollution
  • ›Equipment

WCIRB classes usually assigned

  • 6306 Sewer construction

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

Carriers writing this class

Policies on file, statewide

  1. State Compensation Insurance Fund144
  2. Insurance Co. Of The West35
  3. Technology Insurance Co. Inc26
  4. Employers Preferred Insurance Co.25
  5. Travelers Property Casualty Co. Of America21
  6. Zurich American Insurance Co.20
  7. Amtrust Insurance Co.17
  8. Omaha National Casualty Co.17
  9. Wesco Insurance Co.16
  10. Pie Insurance Co.15

C-42 workers' comp renewals by month, California

21
Sep
104
Oct
31
Nov
43
Dec
68
Jan
28
Feb
43
Mar
75
Apr
40
May
36
Jun
42
Jul
32
Aug
2
Sep

Counties with the most

  1. Los Angeles County173
  2. Riverside County84
  3. San Bernardino County82
  4. Alameda County73
  5. Contra Costa County44
  6. Orange County38
  7. San Diego County38
  8. Santa Clara County35
  9. Sonoma County27
  10. Ventura County23
  11. Sacramento County22
  12. Kern County19

Related classes in Plumbing

C-34 Pipeline ContractorC-36 Plumbing ContractorC-55 Water Conditioning Contractor

Frequently asked

What does a C-42 licence allow a contractor to do?
Installs septic and sewage systems.
What insurance does a C-42 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-42 contractors are there in California?
960 active licences hold the C-42 classification as of 2026-09-06; 590 (61%) have workers' comp on file and 330 are exempt.
When do C-42 workers' comp policies renew?
168 renew within 90 days. October is the peak month.
Which WCIRB class codes apply to C-42 work?
Most often 6306 (Sewer construction). The WCIRB assigns the class from the actual operations and payroll, so verify per account in the WCIRB classification search.
Selling to C-42 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 worksSearch 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 →