100+ Free CMC Practice Questions
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Per S500, Class 1 water intrusion is defined as:
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Key Facts: CMC Exam
120
Exam Questions
ACAC Candidate Handbook
75%
Passing Score
ACAC Candidate Handbook
3 hours
Exam Duration (closed-book)
ACAC Candidate Handbook
$500
Total Fee ($400 cert + $100 exam)
ACAC fees page
8 years
Field Experience (4 yrs with 4-yr degree)
ACAC
CESB
Accreditation Body
ACAC
40 RCs
Recertification Credits per 2-year Cycle
ACAC
The ACAC CMC (Council-certified Microbial Consultant) is the senior microbial consulting credential issued by the American Council for Accredited Certification (ACAC) and is accredited by the Council for Engineering and Scientific Specialty Boards (CESB). It is the most rigorous certification in the ACAC microbial track, intended for experienced consultants who design sampling strategies, interpret complex lab data, provide expert testimony, and lead multi-disciplinary investigations. The 120-question, 3-hour, closed-book exam (75% passing score) covers microbial risk analysis, advanced sampling and lab QA/QC, building science, ANSI/IICRC S520, ANSI/IICRC S500, ASTM D7338, and consulting practice. Prerequisites: 8 years of field experience (reduced to 4 years with a 4-year science/engineering degree, or 6 years with a 2-year degree). Certification is valid for 2 years and requires 40 Recertification Credits and unanimous approval of the CMC certification board.
Sample CMC Practice Questions
Try these sample questions to test your CMC exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1Which is the senior microbial consulting credential offered by ACAC, accredited by CESB?
2Per ACAC's microbial consulting handbook, the CMC examination consists of how many questions?
3ACAC requires CMC candidates WITHOUT any qualifying degree to have how many years of documented field experience in mold inspection/sampling?
4Sterigmatocystin, a metabolite of Aspergillus versicolor, is classified by IARC as:
5Which mycotoxin class is most commonly produced by Stachybotrys chartarum?
6Which method is BEST for chronologically integrating a building's mold burden over months?
7An indoor environmental consultant designing a sampling strategy for a litigation-support case should prioritize which principle?
8Which lab accreditation specifically applies to U.S. environmental microbiology labs analyzing mold samples?
9When acting as IEP, what is the BEST first step after a CMC arrives at a building with reported water damage and complaints?
10ANSI/IICRC S500 Category 3 water includes which of the following?
About the CMC Exam
The CMC is the senior microbial consulting credential from ACAC, certifying competence in advanced microbial investigation, building forensics, risk analysis, and consulting practice. The 120-question exam is the most rigorous in the ACAC microbial track and is accredited by CESB.
Questions
120 scored questions
Time Limit
3 hours
Passing Score
75%
Exam Fee
$500 (certification + exam) (ACAC (American Council for Accredited Certification))
CMC Exam Content Outline
Microbial Risk Analysis & Ecology
Mycotoxins, bioaerosol exposure, dose-response, sensitive populations, indicator vs. allergenic vs. toxigenic species
Advanced Sampling & Lab QA/QC
Air-O-Cell, Andersen N6, qPCR-based ERMI/HERTSMI-2, AIHA-LAP EMLAP, field blanks, chain-of-custody
Building Science & Forensic Investigation
Vapor drive, dew point, HVAC pathways, hidden mold, infrared thermography, forensic methodology
Standards, Codes & Regulations
ANSI/IICRC S520, S500, ASTM D7338, EPA, NIOSH, OSHA general duty, state mold programs
Consulting Practice, Reporting & Ethics
Scope of work, expert testimony, conflict of interest, separation of assessment from remediation, ACAC Code of Ethics
How to Pass the CMC Exam
What You Need to Know
- Passing score: 75%
- Exam length: 120 questions
- Time limit: 3 hours
- Exam fee: $500 (certification + exam)
Keys to Passing
- Complete 500+ practice questions
- Score 80%+ consistently before scheduling
- Focus on highest-weighted sections
- Use our AI tutor for tough concepts
CMC Study Tips from Top Performers
Frequently Asked Questions
What is the CMC exam?
The CMC (Council-certified Microbial Consultant) exam is the senior microbial consulting credential from ACAC (American Council for Accredited Certification). It tests advanced competency in microbial risk analysis, sampling strategy, building forensics, lab QA/QC, ANSI/IICRC S520 standards, and consulting practice.
How many questions are on the CMC exam?
The ACAC CMC exam contains 120 multiple-choice questions delivered as a 3-hour, closed-book examination through Kryterion testing centers. A score of 75% is required to pass.
How is the CMC different from the CMI?
The CMI (Council-certified Microbial Investigator) is the standard investigator credential requiring 2 years of field experience. The CMC (Council-certified Microbial Consultant) is the senior consulting tier requiring 8 years of experience (or 4 years with a 4-year degree) and unanimous board approval. The CMC exam has 120 questions vs. 100 for the CMI, and CMC holders typically lead complex investigations, design sampling strategies, and provide expert testimony.
Is the CMC accredited?
Yes. The CMC is accredited by the Council for Engineering and Scientific Specialty Boards (CESB), a nationally recognized independent accreditation body. This makes the CMC one of the highest-tier microbial consulting credentials available.
What are the prerequisites for the CMC credential?
ACAC requires 8 years of documented field experience in mold inspection and sampling. This is reduced to 4 years with a 4-year college degree in science, engineering, or a related field, or 6 years with a 2-year degree. Candidates must also receive unanimous approval from the CMC certification board and agree to the ACAC Code of Ethics.
How long is the CMC certification valid?
The CMC certification is valid for 2 years from the date of issue. Holders must accumulate 40 Recertification Credits (RCs) — each representing 1 hour of continuing education or professional development — prior to expiration to maintain the credential.
How long should I study for the CMC exam?
Most candidates prepare for 100-150 hours over 8-12 weeks. Prioritize advanced sampling strategy, mycotoxin risk analysis, ANSI/IICRC S520 condition classifications, building forensics (vapor drive, dew point, HVAC pathways), and the regulatory landscape (NY Article 32, EPA, NIOSH, OSHA general duty).