Mold Testing in Tukwila, WA

Can a test help me as a Tukwila renter?

Only about 40 percent of Tukwila's housing units are owner-occupied, so a lot of mold questions here come from renters. Tukwila requires rental units to carry an annual license and to pass a city inspection before first occupancy and every four years, and tenants with living-condition concerns can ask the Rental Housing Program for a courtesy city inspection. The program's page also links mold resources for tenants and owners. A private test can add detail, but the most useful record is usually written notice to the landlord describing the leak or dampness. Washington law requires landlords to keep units weathertight and to give tenants DOH-approved mold information. This is general information, not legal advice.

What will the results actually say?

There are no federal limits for mold spores, so a report won't give a pass or fail. A good one compares indoor air with an outdoor sample, notes the spore types found, lists moisture readings and recommends a next step. Surface samples can show whether a stain is mold growth. As a national reference, Angi's 2026 data lists a surface or swab test at $200 to $300 and a basic air test at $250 to $350. Angi also suggests hiring a tester who is not bidding on the removal.

Does the 2025 levee breach matter for my home?

On December 15, 2025, the Desimone Levee on the Green River breached during repeated atmospheric river storms, and a GO NOW evacuation covered the part of Tukwila south of S 180th Street and west of West Valley Highway, mostly an industrial and business area. If your building took on water then, treat soaked materials as moldy and dry or remove them; testing is for checking hidden areas or confirming cleanup afterward. Most Tukwila homes away from the river deal instead with the ordinary wet-season pattern of condensation and slow drying.

Rebuilding after cleanup

If remediation leads to new drywall or framing, the City of Tukwila Permit Center issues building permits and can say what the job needs. Owners preparing a unit for its periodic rental inspection can use a pre-inspection test to check a unit that smelled damp at move-out, but fixing the leak or ventilation problem is what keeps the unit from smelling the same way again next winter. Keep the lab report, the moisture readings and repair invoices together.