Free for homeowners
Pest control in Washington
What are the most common pests in this state, and who handles them?
Pest control in Washington means moisture work: west of the Cascades, dampwood termites and carpenter ants attack wet structural wood, and when the fall rains arrive, roof rats and Norway rats move indoors across Seattle and Tacoma. Yellowjackets build statewide into late summer. PestChief introduces Washington homeowners to one independent local pest control company.
Where can you read about each pest?
Pest pressure here is shaped by climate, geography and housing stock, so it varies across the state. The notable issues for this state are set out on this page. For how each pest is identified, what the signs look like and what treatment usually involves, read the pest guides.
What is the climate like here?
Climate is the biggest single driver of which pests live here and how long their season runs.
Which pest issues stand out here?
- Dampwood termites in wet structural wood west of the Cascades
- Carpenter ants and moisture ants in homes with roof and crawlspace moisture
- Roof rats and Norway rats entering with the fall rains in Seattle and Tacoma
- Yellowjacket pressure in late summer across the state
Which pests are active in each season?
Activity shifts through the year, so the pest worth treating in March is rarely the one worth treating in August.
Which pests are active in spring?
Which pests are active in summer?
Which pests are active in fall?
Which pests are active in winter?
How does pest pressure vary by region?
Pest pressure is not uniform across a state. Elevation, humidity, soil and the age of the housing stock all change which pests appear and when.
Which regions of the state face which pests?
When do termites swarm in each region?
Is your ZIP code in Washington covered?
PestChief is free to the homeowner. Coverage is checked ZIP code by ZIP code, not state by state. Give your ZIP code and the pest you are seeing, and if an independent local pest control company covers that ZIP code and handles that pest, your request goes to that one company, and it contacts you directly.
What licensing should you ask a company for?
Licensing is the one check a homeowner can make before any work starts. Every state requires a pest control company to hold a license, and most require a separate certification for specialty work such as termite treatment. Ask for the license number, confirm it covers the pest you have, and check it with the state agency that issues it.
What does this state require of a licensed company?
What else should you know about this state?
A few state specific details that change how pest control works here, and what they mean for a homeowner.
Which metro areas are covered?
Coverage varies inside a state, not only between states. A company that covers one metro area may not cover a rural ZIP code two counties away, and the pests it is licensed to treat can differ as well. The metro areas listed here are where PestChief most often has a company to introduce you to. If your city is not listed, a ZIP code check is still worth doing.
What do homeowners ask most?
What pests are most common in Washington?
Carpenter ants, rodents, yellowjackets and dampwood termites fill Washington's pest call sheet. The local pressures:
- Dampwood termites in wet structural wood west of the Cascades
- Carpenter ants and moisture ants in homes with roof and crawlspace moisture
- Roof rats and Norway rats entering with the fall rains in Seattle and Tacoma
- Yellowjacket pressure in late summer across the state
When is pest season in Washington?
Washington's pest year runs wet-dry-wet: spring rain drives ants, summer dries into the wasp and spider peak, and the returning fall rain pushes everything indoors.
Spring: Ant activity climbs sharply in wet weather; wasp queens start nests. Summer: Yellowjacket colonies peak; spiders build through the dry stretch. Fall: Returning rain pushes roof rats, spiders and ants into structures. Winter: Carpenter ant and rodent work tracks winter roof and crawlspace moisture.
Who licenses pest control companies in Washington?
The Washington State Department of Agriculture licenses pesticide applicators and structural pest inspectors and administers structural pest control certification. Ask to see a company's Washington license before treatment and check that it covers the pest you have.
How much does pest control cost in Washington?
Nationally, single visits average about $171 (This Old House); published figures run $300 to $550 (HomeAdvisor) for one time treatment programs and $300 to $900 (HomeGuide) a year for recurring plans, none of them PestChief quotes. Washington carpenter ant jobs usually trace back to roof or crawlspace moisture, and the company that inspects your home sets the actual price.
Why do Washington homes get carpenter ants?
Carpenter ant jobs in Washington usually trace back to roof or crawlspace moisture. The ants do not eat wood, they excavate wood already softened by water, so they follow leaks, failed gutters and damp crawlspaces, west of the Cascades especially. Fixing the moisture source is part of the treatment rather than an afterthought.
Does PestChief cover Washington?
Washington coverage centers on the Seattle area. Coverage comes down to your ZIP code: it is set ZIP code by ZIP code and company by company, and the locations finder is the fastest check. PestChief passes your request to one independent local pest control company that covers your ZIP code and handles your pest, and that company contacts you directly. If no company covers your ZIP code, PestChief tells you so.
Where does this information come from?
Seasonality and pest biology
- US EPA, Integrated Pest Management principles
- UC Statewide IPM Program, Home and Landscape pests
- Penn State Extension
- CDC, Rodents
- US EPA, Rodenticides
Pricing
National estimates from published industry sources. Not PestChief quotes.
Licensing
Licensing is administered by Washington State Department of Agriculture.
Ready to get this handled?
It costs the homeowner nothing. Coverage is checked ZIP code by ZIP code. Give your ZIP code and the pest you are seeing, and if an independent local pest control company covers that ZIP code and handles that pest, your request goes to that one company. It contacts you directly, and it sets its own price.
What should you check before you hire?
Every state we cover
Browse the full list of states and metro areas, and check whether your area is covered.
Pests, one by one
Identification, signs of an infestation and what to do first, for each pest we cover.
What pest control costs
National ranges by treatment type, with the basis for each figure stated plainly.
Season by season
Which pests get active when, and the months worth acting in before a problem grows.
Learn the basics
Plain explanations of treatments, prevention and the questions worth asking a company.
How PestChief works
We match a homeowner with one independent local pest control company. Here is what happens.