United States · Licensing examOfficial plumbing license lookup tools
| Where | Board | Search |
|---|---|---|
| Texas | State Board of Plumbing Examiners | Public License Search |
| California | Contractors State License Board | Check a License: by license number, business name or personnel name |
| Washington | Labor and Industries | Verify a contractor, tradesperson or business, including certified plumbers |
| North Carolina | Board of Examiners of Plumbing, Heating and Fire Sprinkler Contractors | License Search |
| Illinois | Department of Public Health | Plumber License Verification |
| New York City | Department of Buildings | Licensee and registrant search |
| Virginia | DPOR | License Lookup, which also shows CE hours needed to renew |
| Tennessee | Board for Licensing Contractors | License search |
| Indiana | Professional Licensing Agency | License verification |
How does a plumbing license lookup work?
- Ask for the license number. Illinois requires plumbing adverts to show it.
- Open the lookup for the state where the work is, not where the company is based.
- Check the name, license type and expiry date match the person or business you're hiring.
- For a business, check the contractor license too, where your state has one.
States not in this list
Your state's licensing agency runs its own search. The boards page shows who licenses plumbers in the states covered here.
Sources: TSBPE home page (public license search · CSLB · Washington L&I and 6 more. Checked October 2026.
- TSBPE home page (public license search, apply and renew) ↗
- CSLB: Check a License ↗
- Washington L&I: Verify a Contractor, Tradesperson or Business ↗
- NC Board home page (license search) ↗
- Illinois Department of Public Health: Plumbing ↗
- NYC Department of Buildings: Check License and Registration Status ↗
- Virginia DPOR: Tradesman Program ↗
- Tennessee Board for Licensing Contractors ↗
- Indiana Professional Licensing Agency: Plumbing Commission ↗
Rules and fees can change, so check the official site before your test.