What is the most prestigious certification for mold remediators? What designation demonstrates the highest level of expertise?  The answer is the Council- certified Microbial Remediation Supervisor (CMRS).  The CMRS is an accredited certification offered by the American Council for Accredited Certification (ACAC).


Sure, there are other certifications by other organizations, but the CMRS is the designation for which all mold remediation contractors should aim.  Unlike certifications from other organizations, the CMRS is an accredited certification and has been selected by some states that have created licensing requirements.


Indoor Sciences is an approved training provider of the Indoor Air Quality Association.

IAQA Training Provider


CMRS Prerequisites

According to the ACAC, candidates for the CMRS certification must possess one of the following combinations of education and relevant field experience:


  • No degree with at least 8 years of documented experience in microbial remediation. (high school diploma or GED required.)
  • A 2-year post-secondary degree or its equivalent (15 credit hours) in microbiology, engineering, science, architecture, industrial hygiene or related field of science with at least six (6) years of documented experience in microbial remediation.
  • A 4-year post-secondary degree or its equivalent (30 credit hours) in microbiology, engineering, science, architecture, industrial hygiene or related field of science with a minimum of four (4) year of documented field experience in microbial remediation.


CMRS Course

We offer the CMRS as an online course.  If you have a private group that would like to host an on-site class at your facility, please reach out to us.


The format of our course involves watching presentations, reading our 100+ page manual, and taking our 100+ question practice examination. This is a 16-hour course that can also qualify you for continuing education credits for several industry organizations. Even though this is an online course, you’ll have the opportunity to communicate with the instructor to answer any questions.  Access to the online training is for 3 months, after which you can purchase extensions if you have not completed. Once you have completed the training, you will receive a certificate of completion (not certification) from the Indoor Air Quality Association (IAQA), our sponsoring organization.  To get the CMRS certification, you will need to pass the ACAC accredited exam that is offered at proctored testing centers.


Our CMRS course includes access to our practice exam, which is a great way to experience the breadth and depth of topics covered on the CMRS exam. Our CMRS practice exam has over 100 questions similar to ones you might find on the ACAC’s Certified Microbial Remediation Supervisor examination. Because the CMRS is an accredited certification, Indoor Sciences does not have a copy of the ACAC’s examination. Although our questions are not identical to those found on the CMRS exam, they are based on the very same concepts. We are always refining our practice exam to ensure it reflects the topics currently covered in the ACAC examination.


Indoor Sciences has a successful history of preparing students for the CMR.  In fact, we have a money back guarantee! A comprehensive list of topics covered in the course can be found here: CMR/CMRS Topics.



What is the difference between the CMR and CMRS?  The CMR requires 2 years of experience and the CMRS requires 8 years (the requirements are reduced if you have a college degree in a related science field). The actual CMR and CMRS exams cover the same breadth and depth of material.  In fact, we combine our CMR and CMRS students together into the same online course and our students are successful in passing both exams.


If you qualify for the CMRS, we recommend you achieve that certification as it is a more prestigious designation.



The cost of the CRMS Online Course is $795.  IAQA members receive a $100 discount.  To register for our course, call our office at 312-920-9393 or visit this page: CMRS Online Registration.


After registering, you will receive login credentials and we will mail all U.S.-based students a copy of the manual.


Exam Details

Once you’re ready to take the ACAC’s CMRS examination, you’ll need to fill out an application on ACAC’s website.  Once they notify you that you can proceed, you will work with the ACAC to schedule the exam at a nearby testing center.  You can find a proctored testing location by clicking this link: Testing Locations


To learn more about the CMRS examination, we recommend you contact the ACAC.  However, here are some key details regarding the exam:

  • To pass, you must score a 75% or above
  • All questions are multiple choice
  • 120 total questions
  • You are not penalized for a wrong answer
  • You have 3 hours to complete the exam
  • The CMRS is a closed-book exam


If you have any questions, call our office at (312) 920-9393.