Mold Remediation Certification: Every Path Explained (2026)

Do you need a certification to do mold remediation?

No federal license or certification is required to perform mold remediation in the United States. The EPA publishes mold guidance but does not license remediators, and OSHA has no mold-specific standard — its respiratory protection, hazard communication and general duty rules still apply to your crew.

That is the legal floor, not the working reality. Insurers, property managers and independent indoor environmental professionals expect crews to work to the ANSI/IICRC S520, and when a job ends up in a dispute, the S520 is what your work gets measured against. Certification is how you show you were trained to it. And in Texas, Florida, New York, Louisiana and Washington DC, a license is not optional at all.

What's the difference between a mold remediation certificate, a certification and a license?

A certificate proves attendance, a certification proves you passed an exam, and a license is government permission to sell the work. People use the three words interchangeably and then get burned when a state inspector asks for the one they do not have.

• Certificate. A document from a school confirming you completed a course. It carries no exam and no renewal cycle. A four-hour awareness course produces a certificate.
• Certification. A credential issued by a certifying body after you pass its exam and keep it current. IICRC AMRT, ACAC CMR and NORMI credentials are certifications. They are voluntary, industry-issued, and renewable.
• License. Legal authorization from a state agency to perform or sell mold remediation in that jurisdiction. It usually requires approved training, insurance and a fee, and working without one where it is required is an enforcement matter.

One confusing exception: in Texas, "Certificate of Mold Damage Remediation" means something completely different — it is the document a licensed mold assessor issues to the property owner after remediation is finished, and sellers must provide those certificates to buyers. The rules for it sit with TDLR.

The IICRC path: WRT → AMRT → MRS

The IICRC route runs in a fixed order: Water Damage Restoration Technician (WRT) first, then Applied Microbial Remediation Technician (AMRT), then the supervisor-level mold credential. AMRT is the technician certification covering the mold remediation standard of care and WRT is its prerequisite, which is why nobody walks into a mold class cold.

That order makes sense on the job. Mold is a moisture problem before it is a mold problem, and AMRT assumes you already understand water categories, drying and moisture measurement — the WRT material. If you do not hold WRT yet, start there; our sister site WRTTraining.com covers that exam.

Once you hold WRT, the mold path is a four-day AMRT class taught by an IICRC-approved instructor with the exam at the end. Our complete AMRT certification guide walks through every exam topic, and the S520 explainer covers the standard the exam is built on. Above technician level, the IICRC also offers a mold-remediation specialist credential; its current name and prerequisites are listed at iicrc.org.

ACAC certifications (CMR, CMRS)

ACAC certifications are experience-based rather than class-based, and they are third-party accredited. The two mold-remediation credentials are CMR — Council-certified Microbial Remediator — and CMRS, Council-certified Microbial Remediation Supervisor.

The practical difference from the IICRC route is what gets counted. An IICRC class puts you in a room for four days and tests you at the end. ACAC looks at documented field experience and then examines you. Contractors who have been running mold jobs for years often pick up an ACAC credential to prove the experience they already have, and hold AMRT for the technician-level training record. Current credential names, experience minimums and exam format are published at acac.org.

NORMI

NORMI — the National Organization of Remediators and Mold Inspectors — is another certifying body offering mold inspection and remediation credentials, and it appears on some state-approved training provider lists. It is worth checking specifically if your state requires approved training hours.

We do not list NORMI's individual credentials here because they change. The current list sits at normi.org, and whether your state accepts NORMI training is answered on your state agency's approved-provider list.

Which states require a mold remediation license?

Five jurisdictions license mold work: Texas, Florida, New York, Louisiana and the District of Columbia. Treat every other state as having no state mold license unless you confirm otherwise with that state's agency — and note that city or county rules can still apply.

We deliberately do not describe each state's hour requirements, insurance minimums or renewal cycles here. Those details change and getting them wrong costs you a job — read them on the agency pages linked above.

How to get mold remediation certification, step by step

1. Check your state first. If you are in TX, FL, NY, LA or DC, the license dictates which training counts. Everywhere else you are choosing freely.
2. Earn WRT. It is the IICRC prerequisite for AMRT and the foundation for everything moisture-related on a mold job.
3. Book an AMRT class. Find an IICRC-approved school and date in our class directory. We do not teach the class or issue the certification — the schools listed are third parties.
4. Study the S520 before you sit down. The class is four days and the exam is at the end of it; people who arrive cold spend day four cramming. Work the study modules and the practice exams first.
5. Pass the exam and register your certification. The IICRC issues the credential, not the school.
6. Add experience-based credentials later. Once you have documented field time, ACAC's CMR or CMRS is the natural next layer.
7. Keep it current. IICRC certifications renew on a cycle with continuing education credits; the current counts and fees are at iicrc.org.

How much does it cost and how long does it take?

Budget for four separate things, not one price: the class tuition, the exam or certification fee, the standard itself, and — if you are in a licensing state — the license application. The time cost for the IICRC route is four days of class plus whatever study you do before it.

• Course tuition, charged by the school, not the IICRC — ask the schools you are considering for their current price.
• Certification / exam fee, published by the IICRC at iicrc.org.
• Your copy of the ANSI/IICRC S520, which must be purchased from the IICRC.
• State license application, renewal and insurance, where required — see the agency page for your state.
• Renewal: annual maintenance plus continuing education credits, as set out at iicrc.org.

We do not publish dollar figures on this page because school pricing varies by market and dates, and a stale number is worse than none.

Can you get certified online?

Partly. IICRC-approved schools commonly run AMRT by livestream as well as in person, and some other certifying bodies run fully online programs. What you cannot do is skip the exam.

The catch is state acceptance. A livestream class that satisfies the IICRC may or may not satisfy a state agency's approved-training requirement, and that is a question only the agency can answer — ask TDLR, DBPR, the New York Department of Labor, the LSLBC or DOEE before you pay. Our mold remediation training guide compares the formats in more detail.

Which mold certification should you get first?

It depends on what you actually do on site. Technicians start with the IICRC; assessors and consultants start with ACAC and the state assessor license.

• Field technician. WRT, then AMRT. That is the whole answer.
• Crew lead or supervisor. AMRT first, then the supervisor-level credential — IICRC's mold specialist track or ACAC's CMRS.
• Assessor / consultant. You are on a different track: assessment is a separately licensed activity in TX, FL, NY and DC, and the same person or firm generally cannot both assess and remediate the same job. The conflict-of-interest rules are written by each state agency, so read the one that governs your work.
• Property manager or facilities staff. You may not need certification at all — you need enough S520 literacy to hire well and read a remediation protocol. Start with the S520 explainer and the glossary.

Prepare for the AMRT exam

The IICRC sets the number of questions, the time limit and the passing score; confirm current details when you register for the exam at iicrc.org. Knowing the material is half of it; the other half is not stalling on scenario questions.

Work the seven AMRT study modules, drill the AMRT flashcards for the vocabulary, then run timed sets in the practice exam simulator until you are clearing 80% comfortably. The free mold remediation calculators cover the containment volume, negative air and ACH math that shows up in scenario questions.

Frequently asked questions