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Key takeaways
- California: 18,294 licenses list class C-36 (CSLB, Oct 2026).
- In Texas, plumbers are licensed by the State Board of Plumbing Examiners (TSBPE), not TDLR.
- Always confirm on the official state portal before hiring.
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Who licenses plumber contractors
In Texas, plumbers are licensed by the State Board of Plumbing Examiners (TSBPE), not TDLR. In Washington, plumbing is regulated separately from contractor registration.
Verify before you hire
Status, expiry and (in CA) bond and workers' comp — from official data.
How to verify
- Get the license number.
- Search above or on the state portal.
- Confirm active status and expiry.
- Confirm the classification (C-36 in CA) matches the job.
- Ask for insurance and bond proof.
Hiring checklist
Hiring a plumber contractor — checklist
- License active, correct classification
- Expiry after project end
- Insurance certificate received
- Permit pulled where required
- Written contract matches licensed name
Are you the contractor?
Verify before you hire
Status, expiry and (in CA) bond and workers' comp — from official data.