Plumbing contractor (C-36) in Castro Valley, CA

There are 5 Plumbing contractor (C-36) licenses with an address of record in Castro Valley, CA, in the CSLB License Master data checked Oct 27, 2026. That is 0.2% of the 2,617 such licenses statewide; Castro Valley ranks #146 of 514 CA cities for this license type. They are spread across 2 ZIP codes; the most common are 94546 (3), 94552 (2). Most list Alameda County. By business type: Corporation 4, Sole Owner 1. The median first-issue year is 2017; the oldest license dates from 2015. 3 of them come up for renewal or expiration in the next 12 months, so re-check status before you sign a contract.

What a Plumbing contractor (C-36) license covers

Plumbing (C-36) covers systems that supply safe water and remove liquid and water-borne waste, including water heaters, fixtures, gas piping, drain lines and backflow devices.

How to verify a license

Enter the license number in CSLB Instant License Check and confirm the status is active, the classification matches the work, and the contractor has a current bond and workers' compensation coverage (or a valid exemption). California requires the license number on contracts and advertising. Official lookup: CSLB Instant License Check.

Plumbing contractor (C-36) licenses in Castro Valley

Showing 5 of 5, A to Z. Listing order is alphabetical, not a recommendation.