Only Five U.S. Jurisdictions License Mold Work — and Three You've Heard Otherwise Don't

If you search for whether your state licenses mold remediation, you will find confident, conflicting answers. A widely repeated figure says “8 to 10 states.” We tested that claim the only way that settles it: by reading each state's statutes and its licensing agency's own pages, then having a second, independent reviewer re-check every citation.

The verified answer: five U.S. jurisdictions operate a mold-specific licensing program — Texas, Florida, New York, Louisiana, and the District of Columbia. A sixth, Illinois, has enacted a registration law that is not yet in force.

The three states that surprised us

Maryland, Virginia and Tennessee are frequently listed as mold-licensing states. None of them runs a mold licensing program. A contractor in those states may hold a general contractor licence and IICRC certification — both meaningful — but there is no state “mold licence” to verify, and any site claiming to check one is checking something that doesn't exist.

The one rule all five share

Every licensing jurisdiction bars the same party from assessing and remediating the same mold problem. The logic is plain: a contractor who diagnoses the problem they'll be paid to fix has an obvious incentive to find more of it. In Texas it's Occ. Code §1958.155; in New York, Labor Law §936; Florida imposes a 12-month separation in §468.8419. Even in the 45 states with no licence, insisting on an independent assessor is the single most effective way to avoid an inflated scope of work.

What about Illinois?

Illinois passed the Mold Remediation Registration Act, and a 2025 amendment will require remediators to register with the state and hold an active third-party certification such as IICRC. But the state's health department states the requirements “will not be in effect until the adoption of pending rulemaking.” No registry exists yet. We're watching it.