3 certified mold remediation firms serve Seattle, Washington — 2 certified across the full water-mold-fire stack. Every certification below is verified against IICRC's registry.
Certifications verified against the IICRC Certified Firm registry. Last checked August 14, 2026. Ordering is by verified credentials only — never by payment.
Showing the 3 firms with a verified street address. Click a marker for the firm's name, credentials and phone number.
Sponsored placement — available Featured slots are labeled and never change the organic order below. Providers: learn more.
3 certified mold remediation firms in Seattle, WA
Ordered by verified credentials only — cross-verified firms first, then active state licences, then breadth of certification. Payment never affects this order.
Washington does not run a mold-specific licensing program. Only five US jurisdictions do (Texas, Florida, New York, Louisiana and the District of Columbia; Illinois has enacted a program that is not yet in force). In Washington, the credentials to check are IICRC certification, general contractor licensing where applicable, and insurance.
Can my mold inspector also do the remediation?
4 of the 5 licensing jurisdictions bar the same party from assessing and remediating the same property or project: Texas, Florida, New York and Louisiana. District of Columbia does not — the rule there is disclosure of conflicts and a bar on working where the licensee has a financial interest, not a prohibition on holding both roles. Where no mold licence exists, nothing stops one firm doing both — using an independent assessor is then your own protection against a contractor writing the scope of work they will be paid to perform.
How many certified mold remediation companies are in Seattle?
3 firms in Seattle hold verifiable credentials for this work, of which 2 are cross-verified in two independent registries.
What should I do in the first 24 hours?
Stop the source if it's safe, photograph and video everything before touching it, keep damaged materials as evidence, and notify your insurer the same day. See our first-24-hours checklist for the full sequence.
How is this list ordered?
By verified credentials only: cross-verified firms first, then active state licences, then breadth of certification. Payment never affects order.
Housing here
382,933 housing units in Seattle city, Washington, of which 54% were built before 1980 and 23% before 1940. 56% of occupied homes are rented.
Why this is on the page: older housing has had longer to accumulate water events, and its plumbing and building envelope are closer to end of life — so age is a reasonable proxy for how often local firms meet older construction, not a statement about any individual property. It does not mean older homes have mold. With 56% of homes rented, a large share of water and mold problems here are a landlord repair duty before they are a contractor decision.
Source: US Census Bureau, American Community Survey 2023 5-year estimates — tables B25001 (housing units), B25034 (year structure built), B25003 (tenure). Retrieved August 14, 2026.