Licensed Plumbing (C-36) contractors in Walnut, CA

The California Contractors State License Board (CSLB) lists 11 Plumbing (C-36) contractors in Walnut, California. Each links to a full dossier with license status, insurance, bond, and enforcement — as of October 7, 2026.

11 contractors

1. A Drain Doctor

   Walnut, CA · CSLB #803591 · as of October 7, 2026
   Active · clear
2. Christopher Bonilla

   Walnut, CA · CSLB #1002675 · as of October 7, 2026
   Active · clear
3. Bruce's Plumbing Service

   Walnut, CA · CSLB #904642 · as of October 7, 2026
   Active · clear
4. Michael Joellson

   Walnut, CA · CSLB #957335 · as of October 7, 2026
   Active · open complaint
5. John The Plumber

   Walnut, CA · CSLB #669082 · as of October 7, 2026
   Active · clear
6. KP Plumbing INC

   Walnut, CA · CSLB #1044093 · as of October 7, 2026
   Active · clear
7. David Li

   Walnut, CA · CSLB #1111958 · as of October 7, 2026
   Active · clear
8. Maximum Mechanical Plumbing

   Walnut, CA · CSLB #1051536 · as of October 7, 2026
   Active · clear
9. Peacecal Plumbing

   Walnut, CA · CSLB #1144632 · as of October 7, 2026
   Active · clear
10. G Phillips Plumbing

    Walnut, CA · CSLB #526195 · as of October 7, 2026
    Active · clear
11. Walnut Plumbing

    Walnut, CA · CSLB #1005582 · 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.