How to Check a Pest Control Company in Washington

What licences does Washington require?

A Washington State Department of Agriculture licence is required to apply pesticides commercially, to use restricted-use pesticides and to perform structural pest inspections. Certification requires an exam with a passing score of at least 70 percent, and most classes require the applicant to be 18 or older. Licences are recertified periodically, about every five years according to a secondary summary.

These details come from the bill reports and educational materials listed below. We do not print fees or deadlines, because they change and we have not confirmed the current amounts. For the current rules, ask the state.

A licence is held by a person, and a company can have its own licence too. For inspections, the distinction matters, as the next section shows.

If you are hiring for a one-time job, such as a wasp nest or a trail of ants, it is tempting to skip these checks. It takes a few minutes, and it protects you if something goes wrong, such as a product used on a food surface or damage during treatment. Companies that follow the rules rarely mind being asked.

Condominium owners and landlords have an extra reason to check. They are choosing for other people, and if a licensed provider is not used, the cost of a failed treatment can land on a whole building.

What changed in 2021 for termite and wood inspections?

SB 5317 of 2021 says a structural pest inspector licence is not valid for a complete inspection unless the inspector owns or works for a business with a structural pest inspection company licence. In practice, ask for both the inspector's licence and the company's licence, and confirm that the report carries an inspection control number.

The point of the change, as we read the bill report, is accountability: a report should come from a business that holds its own licence, and not from an individual alone. This is information, not legal advice.

A wood-destroying organism inspection is the document many buyers and lenders ask for. Our termite inspection page explains what an inspection covers, and the guide on termites in western Washington puts the risk in context.

How do I verify a licence?

Ask the company for its Washington State Department of Agriculture licence number, then confirm it with the state yourself. No searchable lookup tool is cited on this page, and no state phone number or address is printed here, so use the state agency's own published contact details. A genuine company expects to be asked.

Write the number down when it is given, together with the name on the licence. Then contact the state and ask whether the licence is current and what it covers.

If a company hesitates, offers a number that cannot be confirmed, or says the number is on its truck and nowhere else, consider that a reason to look elsewhere. Licences are public information, and a legitimate company shares its number.

• Get the licence number and the name it is held under
• Confirm it with the state, not only with the company
• Check that it covers the work you want
• Keep a note of the date you checked

What about repairs, exclusion and rotted wood?

Repair or exclusion work that counts as construction, such as rebuilding rotted framing, falls under Washington's Labor & Industries contractor rules. The state publishes a page for verifying a contractor or tradesperson. We do not claim that pest control alone requires contractor registration, only that repair work that is construction generally does.

Check the contractor on the state page before you sign: verify a contractor or tradesperson. Look at the registration status and any bond or insurance information it shows.

Pest technicians often do light sealing, such as packing small gaps with steel wool or screening a vent. Replacing fascia, siding or framing is another trade. See rodent exclusion for where the line usually falls.

What should I ask before I agree to anything?

Ask what pest was found and how it was identified, what the price includes, how many visits are planned, which products will be used and where, what you need to do to prepare, what happens if the pest returns and who is responsible for the work. Ask for the scope in writing before work begins.

The questions below fit nearly any pest job. A provider who answers plainly is easier to work with than one who dodges. Take notes, or ask for a written estimate.

Whoever you choose, the technician should confirm the price with you before any treatment begins, and you are free to decline it or ask for a second opinion.

Ask about preparation and re-entry in particular. Which rooms must be cleared, how long should children, pets and anyone with breathing problems stay out, and what should be done with food and dishes? The product label sets the legal limits, and the technician should be able to describe them in plain language.

• What exactly did you find, and how do you know?
• What is included in the price, and what is not?
• How many visits, and when is the follow-up?
• Which products, where, and what should children and pets avoid?
• What happens if the problem returns?
• What is your licence number, and who holds it?

A licence is a floor, so what else shows a company is worth hiring?

Clear, specific answers. A good provider names the pest, explains how it got in, gives a written scope and price, says how many visits to expect and what happens if the problem returns. A licence shows the minimum is met; the quality of the explanation shows how the company works.

Listen for detail. A technician who can say where the ants are entering, which wood is damp or which gap the rats use is doing the job. One who offers only to spray around the house is offering a generic service.

Neighbors and building managers are useful references, particularly in apartments and condominiums, where the same company may already serve the building. Ask what was done, whether it worked and whether the follow-up happened as promised.

Finally, trust the paperwork. A written estimate, a service report after each visit and a clear statement of what is and is not covered are all signs of a company that expects to be held to its word.

What are the warning signs?

A firm price with no inspection, pressure to sign the same day, promises of guaranteed or permanent results, refusal to give a licence number, no written scope, vague product names, and a request for full payment in advance. Any one is a reason to pause, and several together are a reason to look elsewhere.

Pests are living things and buildings change, so no honest provider can promise a permanent result. A fair provider explains what is likely, what could go wrong and what the follow-up is.

A very low quote sometimes covers only a perimeter spray without inspection. A very high one sometimes bundles repairs you could arrange separately. Neither is proof of anything, but both call for questions. See the Seattle pest control cost guide for what moves a quote.

What if I have a complaint?

Start with the company, in writing, with dates and what you want done. If that fails, you can contact the state agency that issued the licence. We do not print contact details for it here, so use the agency's published information. Keep photos, receipts, reports and messages for any complaint.

Calm, specific notes carry more weight than an angry call. Say what was promised, what was done and what remains.

For bed bugs and other pests in a rental, a landlord is often the party to write to first; see our guide on bed bugs in a Seattle apartment.