Licensed Plumbing (C-36) contractors in Diamond Bar, CA

The California Contractors State License Board (CSLB) lists 10 Plumbing (C-36) contractors in Diamond Bar, California. Each links to a full dossier with license status, insurance, bond, and enforcement — as of October 7, 2026.

10 contractors

1. Advanced Tankless And Plumbing

   Diamond Bar, CA · CSLB #1121827 · as of October 7, 2026
   Active · clear
2. All Day Drains

   Diamond Bar, CA · CSLB #1088634 · as of October 7, 2026
   Active · clear
3. Elite Pipe P

   Diamond Bar, CA · CSLB #1144688 · as of October 7, 2026
   Active · clear
4. Expedite Plumbing

   Diamond Bar, CA · CSLB #939646 · as of October 7, 2026
   Active · clear
5. Galvan Plumbing

   Diamond Bar, CA · CSLB #1065435 · as of October 7, 2026
   Active · clear
6. G C Plumbing

   Diamond Bar, CA · CSLB #681446 · as of October 7, 2026
   Active · clear
7. Jay's Plumbing

   Diamond Bar, CA · CSLB #622850 · as of October 7, 2026
   Active · clear
8. J H Plumbing

   Diamond Bar, CA · CSLB #876263 · as of October 7, 2026
   Active · clear
9. Jones Plumbing

   Diamond Bar, CA · CSLB #917266 · as of October 7, 2026
   Active · clear
10. Vanguard Plumbing

    Diamond Bar, CA · CSLB #1161936 · as of October 7, 2026
    Active · clear

See all Plumbing (C-36) contractors in California →

Data sourced from the California Contractors State License Board (CSLB), current as of October 7, 2026. IsItLicensed is not affiliated with or endorsed by the CSLB or the State of California. Always verify against the official record.