Only 137 Firms in America Hold IICRC's Advanced Mold Credential

“Certified” is one of the most abused words in home services. We pulled the entire IICRC certified-firm registry — 6,873 U.S. firms — and sorted them by exactly which certifications they hold.

The core mold credential, Applied Microbial Remediation Technician (AMRT), is held by about 4,000 firms. But the advanced designations — Applied Microbial Remediation Specialist and Mold Remediation Specialist — are held by just 137 firms in the entire country, roughly two or three per state.

An even scarcer signal

The assessment-side credential, Building Moisture Inspection, is rarer still: 61 firms across 24 states. That's the certification that maps to finding and documenting the moisture source — the root cause — rather than just removing what's visible.

How to use this

Certification breadth is a real, checkable quality signal, and it's one almost no directory surfaces. On every Water Fire Mold Lookup profile we decode exactly which certifications a firm holds and what each one covers — verified against IICRC's registry, not the company's marketing. A firm advertising “certified mold experts” with a single carpet-cleaning credential is a very different proposition from one holding the full water–mold–fire stack.