Plain guides on how pests behave through a Puget Sound year: what moves a quote, how carpenter and moisture ants differ, how likely termites are, what to do about rats and yellowjackets, who pays for bed bugs in a rental and how to check a company in Washington. Each one cites public sources.
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Updated October 8, 2026 · 9 min read
A Seattle pest control quote depends on the pest, the type and age of the building, how easily a technician can reach the crawl space and attic, how many visits the job needs and whether sealing or wood repair is included. This guide shows no dollar amounts; the price is confirmed on site before any treatment starts.
Updated October 8, 2026 · 8 min read
Carpenter ants are large and dark and excavate wood to nest; moisture ants are small, light yellowish-brown and nest in damp rotting wood or soil. WSU PestSense describes both, and in a wet region such as Puget Sound the common thread is moisture. Fixing leaks and ventilation matters as much as treating the colony.
Updated October 8, 2026 · 8 min read
Termites exist in western Washington but are generally considered less common than in warmer states, and no local count is available. WSU describes two native types: dampwood termites in wet or rotting wood, and subterranean termites in soil. Damp wood, carpenter ants and decay are the more likely causes of wood trouble in a Seattle house.
Updated October 8, 2026 · 8 min read
Two species cause most rat complaints in Washington: the Norway rat, which burrows low, and the roof rat, which climbs. Public health guidance puts removing food and shelter first, and says poisons are not recommended inside buildings. Public Health - Seattle & King County takes rodent complaints at no fee.
Updated October 8, 2026 · 8 min read
Yellowjacket colonies start from one spring queen and peak near the end of summer; WSU says August to September is when they are most troublesome, and German yellowjacket colonies are largest from October to early November. Leave nests near people to a professional, do not swat, and treat severe allergic reactions as emergencies.
Updated October 8, 2026 · 8 min read
Under RCW 59.18.060(4), Washington landlords must reasonably control pest infestations not caused by the tenant, though not in single-family residences. RCW 59.18.130(2) can make a tenant pay when the tenant caused the problem. Proof of cause is hard. Give written notice early. This is information, not legal advice.
Updated October 8, 2026 · 8 min read
In Washington, applying pesticides commercially and performing structural pest inspections require licences from the State Department of Agriculture. Ask the company for its licence number, confirm it with the state, check that an inspection report carries an inspection control number, and use the Labor & Industries page for any repair work that counts as construction.
Updated October 8, 2026 · 8 min read
Around Seattle, carpenter ants swarm from April to early June, yellowjackets are most troublesome in August and September, dampwood termites swarm in late summer or fall after rain, and the wet season from roughly October to March brings damp-wood and rodent concerns. Only some rows rest on published sources; the rest is common experience.
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