ACAC comes up constantly once you start reading state licensing pages, usually as an accepted credential alongside the IICRC ones — and usually with no explanation of what it is. This post covers the organisation, the microbial remediation credentials, and how they differ from an IICRC certification in the way they are earned.
What is ACAC?
ACAC is the American Council for Accredited Certification, a certifying body that issues indoor environmental credentials based on verified field experience and a written examination. It states that there is no required training course for any ACAC certification, though a study-review course is recommended, and that ACAC does not develop or administer training courses, per its application page.
That single design choice is what makes ACAC different from the IICRC route in practice. The IICRC path runs through an approved course. The ACAC path runs through proving you have already done the work, then sitting an exam on it.
What are CMR and CMRS?
CMR is the Council-certified Microbial Remediator and CMRS is the Council-certified Microbial Remediation Supervisor. ACAC describes both as conducting mold remediation and mold removal projects in the indoor environment, designing and maintaining effective containments, controlling pressure relationships during a project, and safely cleaning, treating or removing affected structures and contents, on its microbial remediation page.
The two sit at different experience levels within ACAC's structure, which groups its credentials by verified field experience — the specific requirements for each are set out in the candidate handbooks on the microbial remediation handbook page. Read those before applying rather than trusting a summary anywhere else, including this one.
How is ACAC different from IICRC?
The IICRC certifies through approved training courses that end in an examination; ACAC certifies on verified field experience plus an examination, with no required course. Neither is "better" — they answer different questions about a candidate.
- Route in: IICRC — take the approved course, sit the exam. ACAC — document your experience, sit the exam.
- What it evidences: IICRC evidences trained competence to a standard. ACAC evidences experience plus verified knowledge.
- Training: IICRC courses teach the material. ACAC does not run courses at all.
- Who recognises it: both appear on state licensing pages; which ones count is decided by the agency, not the certifier.
For someone early in their career, this usually resolves itself: without years of documented field work, the experience-based route is not open yet. That is the practical argument for starting with AMRT.
Does ACAC have inspection credentials too?
Yes — ACAC's programs cover indoor environmental investigation and consulting as well as remediation, listed on its certifications page. That is the family of credentials that comes up when a state requires an independent assessor rather than a remediator.
The separation matters because the S520 model keeps assessment independent from remediation, and several states write that separation into law. If the assessment side is where you are headed, start with mold inspector certification.
Which credential do state licensing agencies accept?
Whichever ones the agency names — and that varies by state and changes over time. Some states list specific certifications, some list approved training hours, some regulate mold work barely at all.
Start with our plain-language summary at mold remediation licensing by state, then follow the link to the agency's own page for your state — for example Texas or Florida. Licensing rules change; confirm current requirements with the agency that issues the licence before you rely on any summary.
Should you hold both ACAC and IICRC credentials?
Plenty of experienced people do, because they answer different questions and because different clients and agencies ask for different things. For most technicians, the sequence is IICRC first for the training and the day-to-day recognition, ACAC later once the field experience is there to document.
Whatever you stack on top, the underlying knowledge is the same standard — the ANSI/IICRC S520 — and the same field judgement: Conditions, containment, PPE and verification. Build that first with the practice exams and the flashcards; the letters after your name follow.
Where should you verify this?
On acac.org for ACAC credentials and iicrc.org for IICRC credentials. AMRTTraining.com is an independent study resource, not affiliated with, endorsed by or approved by either organisation, and both bodies can change their requirements without telling us.
How does the ACAC application process work?
ACAC describes a three-step process: verification of field experience, the written examination, and certification board review, per its applications page. The experience verification is the part that catches people out, because it asks you to document work you may not have recorded at the time.
The lesson for anyone earlier in their career is to start keeping records now: project sheets, roles, dates and references. Documented field time is an asset, and the person who kept a job log for five years has options the person who did not simply does not have.
Is one route more respected than the other?
They are respected for different reasons and by different audiences, so the useful question is who is asking. Insurers and general contractors in restoration tend to know the IICRC alphabet; consultants, public agencies and specification writers on the assessment side see ACAC credentials constantly.
Neither replaces demonstrable competence. A technician who can classify an area correctly, build a containment that holds pressure and produce a clean job file is valuable regardless of the letters; credentials get you the interview and satisfy the licensing agency. Build the competence with the study modules and prove it with whichever credential your market rewards.
What should you do first if you are new?
Get the training-based credential and the field time, in that order, and revisit experience-based certifications when you qualify. There is no shortcut through the experience requirement, and no reason to wait to start learning the standard.
Practically: read the S520 overview, work the practice exams until the Condition scenarios are automatic, take the AMRT course and exam, then look at what your state licensing agency accepts and what your local market asks for. That sequence works in every market we have looked at.
What do these credentials have in common?
Every one of them is measuring the same underlying competence: can you identify contamination, contain it, remove it safely, dry the structure and prove the space came back to normal. The bodies differ on how they test that; the job does not change.
That is worth remembering when the alphabet gets overwhelming. A technician chasing letters without field judgement is worse off than one who understands the standard and holds a single respected credential. Pick the route that fits your experience, then spend your energy on the work.
If you are deciding where to start, the two comparisons worth reading next are AMRT vs MRS for the IICRC side and AMRT vs WRT vs ASD for the order most technicians follow. Then look at the upcoming classes and book something.
How much does the route matter to a customer?
Almost never directly — homeowners ask whether you are certified and insured, not which body issued it. It matters to the people between you and the customer: licensing agencies, insurers, IEPs and general contractors who have a list.
So choose based on who checks your paperwork, not on which logo looks better on a truck. In most restoration markets that means the IICRC route first, with ACAC credentials added later if the assessment and consulting side is where you are heading.
