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CSLB classification · Plumbing

C-55 Water Conditioning Contractor

Installs water treatment and conditioning equipment.

293
Active licences
165
With workers' comp
56%
32
Renewing in 90 days
6
Lapsed or suspended
121
Exempt
1
New in 90 days

Coverages a producer should expect

  • ›Workers' comp
  • ›General liability
  • ›Commercial auto

WCIRB classes usually assigned

  • 5183 Plumbing

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 Fund20
  2. Insurance Co. Of The West10
  3. Security National Insurance Co.8
  4. Hartford Casualty Insurance Co.7
  5. Pacific Compensation Insurance Co.6
  6. Technology Insurance Co. Inc6
  7. Omaha National Casualty Co.5
  8. Everest Premier Insurance Co.5
  9. Travelers Property Casualty Co. Of America5
  10. Sequoia Insurance Co.4

C-55 workers' comp renewals by month, California

6
Sep
17
Oct
8
Nov
8
Dec
23
Jan
10
Feb
11
Mar
19
Apr
10
May
22
Jun
16
Jul
8
Aug

Counties with the most

  1. Los Angeles County49
  2. Orange County28
  3. San Diego County21
  4. San Bernardino County15
  5. Ventura County14
  6. Riverside County14
  7. Sonoma County13
  8. County12
  9. Fresno County12
  10. Santa Barbara County11
  11. Kern County11
  12. San Luis Obispo County10

Related classes in Plumbing

C-34 Pipeline ContractorC-36 Plumbing ContractorC-42 Sanitation System Contractor

Frequently asked

What does a C-55 licence allow a contractor to do?
Installs water treatment and conditioning equipment.
What insurance does a C-55 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; Commercial auto.
How many C-55 contractors are there in California?
293 active licences hold the C-55 classification as of 2026-09-06; 165 (56%) have workers' comp on file and 121 are exempt.
When do C-55 workers' comp policies renew?
32 renew within 90 days. January is the peak month.
Which WCIRB class codes apply to C-55 work?
Most often 5183 (Plumbing). The WCIRB assigns the class from the actual operations and payroll, so verify per account in the WCIRB classification search.
Selling to C-55 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 →

C-55 Water Conditioning Contractor: Insurance and WCIRB Classes | Birdray