How to Choose a Plumber in Washington (and Check Their License)

Washington's two-part licensing system

Washington regulates plumbing at two levels, and a homeowner should check both. The business has to be registered with the Department of Labor & Industries as a contractor with a plumbing specialty, which requires a surety bond and liability insurance on file. That registration is what the license number refers to; ours is WASHIPD777JL, and the format with letters and digits is the same for every contractor in the state.

Separately, the person doing the plumbing has to hold a plumber certificate. Washington does not let anyone who works for a registered contractor do plumbing; the individual has to have passed the state exam for a certificate type or be a registered trainee working under the supervision of a certified plumber. The certificate is tied to the person, not the company, and it has to be renewed with continuing education.

This means a company can be legitimately registered and still send someone without a certificate to your house. It happens with large outfits that staff up fast. Ask the person at the door whether they hold a plumber certificate and what type.

How to run the L&I lookup

Go to lni.wa.gov/verify. The tool is called Verify a Contractor, Tradesperson or Business. You can search by business name, by the contractor license number, or by a person's name for a tradesperson certificate. Search for the company first.

The contractor record shows whether the registration is active, the specialty (it should say plumbing), the bond and the insurance with their amounts and expiration dates, the business owners, and a history of lawsuits against the bond and L&I infractions. An active registration with no infractions and current bond and insurance is the baseline. A registration that lapsed and was reinstated, or a record with bond claims, deserves a question.

Then search the tradesperson. The record shows the certificate type, the status, and the expiration. The owner of a small company is usually the lead plumber; at a larger company, you may not know the technician's name until they arrive, and it is reasonable to ask for it when you schedule.

• Search the company at lni.wa.gov/verify and confirm an active plumbing contractor registration
• Check that the bond and liability insurance are current
• Read the lawsuit and infraction history
• Search the plumber's name and confirm an active certificate
• Match the license number on the truck and invoice to the record

What the plumber certificate types mean

L&I issues several plumber certificates, and the type limits what the holder may do. A journey level plumber, certificate type PL01, is qualified for all phases of plumbing work in any building. A residential plumber, PL02, may install, maintain and repair plumbing in single-family homes, duplexes and apartment buildings up to three stories. A residential service plumber, PL04, is limited to servicing, repairing or replacing existing fixtures, piping and fittings outside interior walls or above the floor in single-family homes and duplexes, plus clearing drains and repairing leaks up to the next serviceable connection in any residential structure.

There are also specialty certificates: pump and irrigation (PL03), domestic well (PL03A), medical gas (MG01), and backflow (PL30, for maintaining existing backflow assemblies, which also requires a Department of Health tester certification). Trainees work under supervision while accumulating hours toward one of these.

For a homeowner, the practical point is that a PL04 residential service plumber cannot legally repipe your house or rough in a bathroom addition, and a PL02 cannot work on a commercial building. If a company is sending a residential service plumber to do a whole-house repipe inside the walls, the work is outside the certificate, and the permit inspection will catch it or it will not get a permit at all.

Questions to ask before you book

Once the license checks out, the rest is about how the company does business. Ask how they price: hourly, or flat-rate quoted before work starts? Ask whether there is a trip or diagnostic charge and whether it is waived if you approve the work. Ask whether the person coming out is certified and what type. Ask who pulls the permit when one is needed and whether it is in the company's name, because a permit in the homeowner's name shifts the liability to you. Ask what the warranty covers and for how long, and get it in writing.

Ask about reviews, and then read them with a plumber's eye. Reviews that describe a specific problem, what was found, and how it was handled are worth more than a hundred that say "great service." Look for mentions of honesty, of a plumber saying something did not need to be replaced, of fixing another company's work, of cleaning up. Look at how the company responds to the rare negative review.

Finally, ask about availability and be realistic. A company that promises a guaranteed arrival time on a Sunday night in a December freeze is promising something nobody can deliver. One that gives you a real window and texts when on the way is telling the truth.

Warning signs that a plumber is selling, not fixing

A good share of our work is fixing or undoing what another plumber recommended. The pattern is familiar. A technician arrives, spends a few minutes looking, and announces that the water heater, the sewer line, or the whole supply system needs replacement, with a price that has to be approved today to lock in a discount. The diagnosis is thin, the camera footage is not shown, and the alternatives are not explained.

Specific things to be wary of: a sewer camera inspection where you are not shown the video; a recommendation to replace a water heater for a problem that is a thermocouple or an element; a repipe quote for a single leak; a drain-cleaning visit that turns into a sewer replacement pitch without any explanation of what the camera saw; and a technician who will not tell you what the alternative to replacement is or what happens if you wait. Also be wary of a flat refusal to quote until you commit, or a price that changes after the work starts.

A plumber who intends to fix things explains what is wrong, shows you, tells you the options and what each one costs, and lets you decide. If one of the options is to do nothing for now, a good plumber says so.

Big company, small company, or handyman

The three counties have all three. Large franchise plumbing companies run many trucks, advertise heavily and tend to use commission-based technicians with replacement targets. They can get to you fast and they are not all bad, but the sales pressure comes with the model. Small licensed companies, which describes most of the plumbers around Port Orchard, Bremerton and Gig Harbor, are usually owner-run, with the owner on the truck or close to it. Handymen are cheaper and often fine for a faucet, but in Washington a handyman cannot legally do plumbing work that requires a certificate, cannot pull a plumbing permit, and has no plumbing bond behind the work.

The right choice depends on the job. A disposal swap or a toilet flapper does not require much. A water heater, a gas line, a repipe or a sewer line requires a licensed plumbing contractor with a certified plumber, a permit and insurance, and the savings from going without are not worth what happens when it goes wrong.

What to expect from a company that does this right

You call and reach a person who asks about the problem and gives you an arrival window. You get a text when the plumber is on the way. The plumber shows up in a marked truck, with the license number on it, introduces themselves, and looks at the problem before saying anything about a price. You get a written flat-rate quote and approve it on your phone or the plumber's tablet. The work is done, tested, cleaned up and explained. The invoice matches the quote, the permit is filed where one applies, and the warranty is in writing.

If something turns out to be simpler than expected, you hear that. If it turns out to be bigger, you hear that before it costs you anything more. That is the standard, and it is not a high bar. It is just one that many companies do not clear, which is why checking the license first and asking the questions above is worth the ten minutes.