When you're researching mold removal companies, one credential comes up more than any other: IICRC certification. Most homeowners don't know what it actually means — or whether a company claiming it is telling the truth.
What IICRC Actually Is
IICRC stands for the Institute of Inspection, Cleaning and Restoration Certification. It is a nonprofit standards organization that sets the technical guidelines for the restoration industry — including mold remediation.
The IICRC's mold remediation standard is called S520. It defines how mold assessments should be conducted, how containment should be set up, what equipment must be used, and critically, that a post-remediation clearance test by an independent party is required before a job is considered complete.
When a company says they are "IICRC certified," they are saying their technicians have passed exams demonstrating knowledge of these standards.
The Two Certifications That Matter for Mold
AMRT — Applied Microbial Remediation Technician. This is the primary mold-specific certification. Technicians with AMRT certification have passed an exam on mold biology, contamination assessment, containment procedures, and proper remediation techniques. This is the credential to ask for on any mold removal job.
WRT — Water Damage Restoration Technician. Mold almost always follows water damage. WRT-certified technicians understand moisture intrusion, structural drying, and the conditions that allow mold to grow. Many mold contractors hold both AMRT and WRT.
How to Verify It in 60 Seconds
Anyone can claim IICRC certification. The only way to confirm it is to check directly.
Go to iicrc.org and use the "Find a Professional" search tool. Search by company name or individual name. A legitimate certified company will appear in the results with their active certifications listed.
If a company claims IICRC certification but does not appear in the database, treat that as a significant red flag. Either their certification has lapsed or the claim is false.
What IICRC Certification Is Not
IICRC certification is not a government license. It is not required by law in most states. It does not mean the company is insured or bonded. It is a voluntary industry credential that signals training and knowledge of professional standards.
It matters because it is the most widely recognized benchmark for mold remediation competency — but it is not a guarantee of quality work.
What to Ask the Contractor
When you call a mold removal company, ask two questions directly:
"Are your technicians IICRC-certified, and which certifications do they hold?"
"Can I verify that on the IICRC website?"
A legitimate company will answer both without hesitation. A company that deflects or claims the database is "out of date" should be treated with caution.
The Bottom Line
IICRC certification — specifically AMRT — is the single most important credential to look for when hiring a mold removal company. It takes 60 seconds to verify at iicrc.org. Do it before you sign anything.