The short answer
Mold remediation licensing exists in a minority of states, and several states on widely circulated lists have repealed their programmes or never implemented them. Asbestos is different: accreditation is effectively universal under the federal AHERA framework.
Standards and licensing are two different systems that get conflated. IICRC standards are consensus documents that define competent practice and carry no legal force by themselves. State licensing is law, and it varies enormously.
We checked the state-by-state mould licensing claims against primary sources rather than repeating published lists, and found errors in both directions. Several states listed as licensing do not; at least one listed as unregulated imposes enforceable conduct standards.
In this section
State mold licensing, corrected
Which states actually license mould work, and eight corrections to the lists in circulation.
What is happening in this area
The most common error in circulating lists is treating an enacted statute as an operating programme. Illinois passed a law whose implementing rules were never adopted, and its health department states plainly that registration is not required until they are.
The second most common error is staleness. Texas moved mould licensing from its health department to its licensing department in 2017, Maryland’s programme terminated in 2019, and Arkansas repealed its licence in 2011. Lists maintained by training vendors rarely propagate repeals.
This section summary is maintained rather than written once. It was last reviewed on 23 September 2026. If something here is out of date or wrong, tell us.