Mold Testing in Mukilteo, WA

Signs that suggest testing could help

• A smell in a daylight basement or lower-level bedroom that you can't trace.
• Stains on a wall facing the slope that come and go with the rain.
• Irritated eyes or a stuffy nose that seems tied to one room.
• A past leak that was repaired without opening the wall.
• A buyer, seller or insurer asking for written documentation.

EPA says mold can irritate the eyes, skin, nose, throat and lungs; anyone with health concerns should talk with a health professional.

Mukilteo's setting

Mukilteo is a waterfront bedroom community on bluffs above Possession Sound, with Port Gardner Bay to the north and a ferry terminal to Whidbey Island near the Mukilteo Lighthouse. The bluffs are cut by ravines and gulches along several creeks, including Hulk Creek, which drains to the Sound, and Japanese Gulch. Severe erosion has closed Mukilteo Lane. Homes built into slopes, from Old Town to Harbour Pointe, can pick up groundwater seepage through below-grade walls during long wet stretches, and air moving off the water keeps exterior walls cool and damp through the winter. Neither shows up on a walk-through as obvious growth, which is where an air sample with an outdoor control can help.

What affects the cost

The biggest factors are how many samples are taken, the outdoor comparison, lab fees, and how hard it is to reach a crawl space or lower-level wall cavity. As national references, Angi's 2026 data lists testing with air and surface sampling at $250 to $500, and HomeGuide's 2026 figures put a bulk sample of drywall or insulation at $100 to $350. Ask for per-sample pricing in writing, and ask whether the report includes moisture readings and a recommendation.

What happens when you call

You'll be connected with an independent local mold inspector. Expect to be asked what you're noticing, where, for how long, and why you want samples. Angi recommends choosing a tester who is not bidding on the removal, so the person reading the results has nothing to sell you. If cleanup later involves replacing drywall or framing, building permit applications go through the City of Mukilteo Permit Center. The city's Code Compliance office handles building code and land use violations but does not enforce tenant-landlord disputes, and the Snohomish County Health Department does not test homes for mold.