Mold Testing in Kent, WA

Is testing worth it after the Green River flooding?

Kent's valley floor flooded from the Green and White rivers for generations, and the Green River kept causing trouble until Howard A. Hanson Dam was finished in 1962. King County still lists the lower Green, including Kent, as at risk for flooding in homes, businesses and industrial areas, and says not all flooding can be prevented. In December 2025, during back-to-back atmospheric rivers, the Army Corps stored a record amount of water behind Hanson Dam to protect Kent and nearby cities, and after a levee failed, King County ordered evacuations in parts of Kent, Auburn and Tukwila.

If water got into your home then, EPA's rule is simple: anything that could not be dried within 24 to 48 hours should be treated as moldy. A test won't change that. Testing pays off in rooms that stayed dry on the surface but share walls or air with the wet areas, and for clearance once the work is done.

I live on East Hill or West Hill, away from the river. Why does my house smell musty?

Most of Kent's homes sit on the West Hill and East Hill plateaus, around places like Lake Meridian and Panther Lake. There, the usual culprits are not floods but the long wet season: condensation on cold windows and exterior walls, bath fans that don't vent outside, a damp crawl space, or a slow plumbing leak. Start with a moisture inspection. If that finds nothing and the odor stays, an air sample in the problem room compared with an outdoor sample can show whether something hidden is adding spores.

Who should take the samples, and what will it cost?

Washington has no state license or certification for mold work, according to the Department of Health, so anyone can offer testing. Ask about training, ask to see a sample report, and consider Angi's advice to use a different company for testing than for removal. Nationally, Angi's 2026 data lists basic air tests at $250 to $350 and swab tests at $200 to $300; HomeGuide's 2026 figures put bulk samples at $100 to $350. Kent prices depend on sample count, home size, access and lab speed.

A note for Kent renters and rebuilders

Renters should give the landlord written notice of leaks or moisture first; Washington law sets timelines for repairs after notice. Before rebuilding walls after a flood, ask the City of Kent which permits apply. General information, not legal advice.