How to Verify a Plumbing Contractor's License in Washington State

Every homeowner in Marysville, WA, deserves to know how to confirm a plumbing contractor is legally authorized to work before anyone touches a pipe. Washington State makes this straightforward through the Department of Labor and Industries (L&I) online database, and a few minutes of verification can protect your home, your wallet, and your warranty coverage.

Why License Verification Matters

Washington State requires every contractor in this trade to carry a surety bond of at least $12,000 and maintain liability insurance before performing work legally. If something goes wrong on an unlicensed job, your homeowner's insurance may not cover the damage. In Marysville's growing neighborhoods, permit inspectors can also flag work done by unregistered contractors, creating costly problems for sellers and buyers alike.

What Credentials Does Washington State Require?

Washington uses two layers of credentialing for plumbing work. A company must hold an active Plumbing Contractor (PC) license issued by L&I, separate from a general contractor registration. Individual journey-level plumbers must also carry their own state certification. Always ask for both before work begins.

How to Look up a Plumbing Contractor's License in Washington

The official tool is Washington L&I's free Verify tool. Search by business name, contractor name, or license number. No account is required, and results update Monday through Friday.

1. Go to Washington L&I's free Verify tool and select "Contractor/Tradesperson."
2. Enter the business name or license number provided by your contractor.
3. Confirm the registration status reads "Active."
4. Verify the bond status shows a current, active bond with sufficient coverage.
5. Check that general liability insurance is in place.
6. Review any safety violations, citations, or lawsuits filed against the bond.

What Should the Results Show?

A clean record displays an active registration, a current bond, and valid liability insurance. A "Suspended" status typically means the surety bond or workers' compensation coverage has lapsed. Do not proceed if any of these three items are missing or expired.

Red Flags for Unlicensed Plumbing Work

Watch for these warning signs before signing any agreement:

• A contractor who refuses to provide a license number or requests cash only.
• A quote significantly below every other estimate you received.
• No physical address or verifiable business name on file with L&I.
• Pressure to skip permits for a Marysville remodel or repair.

Skipping permits in Snohomish County can void a future home inspection and complicate resale. Licensed contractors pull permits as a standard part of the job.

Frequently Asked Questions