How many plumbing contractors are in SEATTLE, CA?

2 with a current California license, as of 2026-08-31.

How do I check a California contractor license is current?

Every listing shows its state license number and expiry date. Verify any of them directly against the California CSLB licensee database.

Plumbing contractors in SEATTLE, CA

2 listings

Source: California CSLB license records. Last verified 2026-08-31.

There are 2 plumbing contractors in SEATTLE, California with a current state license as of 2026-08-31. The earliest license expiry among them is 2027-04-30; every listing shows its own number and expiry date. All are drawn from the California CSLB register; expired and inactive licenses are excluded.

Business	License	Type	Expires	City	Zip
COSTCO WHOLESALE CORPORATION	858087	B, C-10, C-36, D34	2027-04-30	SEATTLE	98124	Set up workspace
OCEAN PARK MECHANICAL INC	986064	C-20, C-36	2027-08-31	SEATTLE	98168	Set up workspace

Quick answers

How many plumbing contractors are in SEATTLE?: 2 with a current California license, as of 2026-08-31.
How do I check a license is current?: Every listing shows its state license number and expiry. Verify any of them directly against the California CSLB licensee database.