- Identity Check: Which CMCC This Is
- The Exam at a Glance
- Eligibility Routes and the Application Packet
- Fees, Retakes and Renewal Math
- The Nine Domains in One Pass
- Chart vs. Handbook: The Grouping Difference
- Official Reference Map
- Exam-Day and Remote-Proctoring Checklist
- Pass Rate and Salary: What You Can and Cannot Claim
- A Domain-Ordered Study Sequence
- FAQ
- The exam is 120 multiple-choice questions in three hours, closed book, with a 75% passing criterion set by modified Angoff.
- Initial US/Canada cost is USD 500: USD 100 exam plus USD 400 certification for the first two-year term.
- Eligibility needs eight, six or four years of documented experience, depending on your education route.
- Renewal costs USD 400 and 40 RCs every two years, and ACAC audits your records.
Identity Check: Which CMCC This Is
"CMCC" is a crowded acronym. This cheat sheet covers only the Council-certified Moisture Control Consultant credential, administered by the American Council for Accredited Certification (ACAC). It is not a chiropractic-college abbreviation, not a climate-research or medical term, and not the Certified Moisture Control Contractor. It is also a separate credential from the CMCI, so keep the consultant requirements and application guidance distinct from that track. For a fuller definition, see What Is CMCC? and What Does CMCC Stand For?.
Certification decisions are made by ACAC's CMCC Certification Board. Kryterion, Inc. is the testing provider. Certification is separate from any licensing-only examination use of the exam, so do not assume the credential and a state license are interchangeable.
The Exam at a Glance
| Item | Must-Know Fact |
|---|---|
| Format | 120 multiple-choice questions, at least four answer choices each |
| Time | Three hours |
| Materials | Closed book |
| Passing criterion | 75%, set by the certification board using modified Angoff |
| Delivery | Testing center or online video-proctored |
| Question handling | Randomized question and answer order |
| Results | Immediate |
| Validity | Two years |
At a 75% criterion on 120 questions, the arithmetic is simple, but ACAC's materials give no scoring detail beyond the percentage. Details are in CMCC Passing Score 2026. Pacing: three hours across 120 questions leaves 90 seconds per item on average, which is enough for scenario-style reasoning only if you do not stall on one question.
Eligibility Routes and the Application Packet
There are three documented routes. All require documented moisture-control consulting experience.
| Route | Education | Experience |
|---|---|---|
| Experience-based | High-school diploma or GED | Eight years |
| Four-year route | Qualifying four-year degree or equivalent with 30 qualifying credits | Four years |
| Two-year route | Qualifying two-year degree or equivalent with 15 qualifying credits | Six years |
Qualifying education is in relevant science, engineering, architecture, industrial hygiene or related fields. The packet includes four project sheets, applicable transcripts and application verifications. The board reviews it, and certification requires unanimous board review. The handbook also requests employer affidavits, and applicants complete an electronic affidavit and required email verifications. A prep course is optional. See CMCC Requirements 2026 for the full walkthrough.
Fees, Retakes and Renewal Math
- Initial fee (US/Canada): USD 500 total, made up of USD 100 for the examination and USD 400 for certification covering the first two-year term.
- Outside the US/Canada: the current official application quotes USD 525.
- Retake: USD 100.
- Renewal: USD 400 every two years.
- Renewal credits: 40 RCs, comprising 10 for continued field activity plus 30 professional-development hours under current procedures.
Keep course and book expenses separate from issuer fees in your budget, since a prep course is optional and the issuer fee covers neither. Retain renewal records in case of audit. The full breakdown is in CMCC Certification Cost 2026, and the scheduling side is in CMCC Exam Dates 2026.
The Nine Domains in One Pass
ACAC's chart (approved March 6, 2024) lists nine unweighted domain lines. No percentage weights or per-domain question counts are published, so do not trust any source that quotes them. For deeper coverage of each area, see CMCC Exam Domains 2026.
Domain 1: The Science of Water
The foundation for every other domain. Expect the physics behind how water moves and where it ends up.
- Capillary action and why it moves moisture through porous materials
- Vapor, liquid and the conditions that shift water between them
- How material properties affect absorption and drying
Domain 2: Site Drainage
Water management starts outside the building.
- How grading and drainage direct water toward or away from structures
- Link between site conditions and foundation moisture problems
Domain 3: Foundations
Where site water meets the structure.
- Foundation moisture pathways and how they present as symptoms inside
- Connecting below-grade conditions to diagnosis
Domain 4: Walls, ceilings, and floors
Interior and assembly-level moisture behavior.
- How moisture travels through and accumulates in building assemblies
- Reading visible damage back to its source
Domain 5: Roofs and building envelope assemblies
The top-down and outside-in water barrier.
- Roof and envelope assembly failure points
- Distinguishing envelope intrusion from interior sources
Domain 6: Plumbing
A leading source of interior water events.
- Plumbing-related moisture sources and how leaks present
- Tying plumbing findings to diagnosis and documentation
Domain 7: HVAC
Mechanical systems both cause and cure moisture problems.
- How HVAC operation affects humidity and condensation
- HVAC's role in drying and in distributing moisture
Domain 8: Structural Drying
Applied science, tied closely to the prescribed drying text.
- Principles and practice of restorative drying
- Specifying drying approaches and verifying results
Domain 9: Project documentation
The consultant's deliverable.
- Recording findings, specifications and outcomes defensibly
- Connecting diagnosis to what the written record must show
Chart vs. Handbook: The Grouping Difference
The dated chart lists nine domain lines. The undated web edition of the handbook's CMCC section lists eight headings in total: seven technical headings plus the ACAC Code of Conduct. Its grouping differs from the chart, and it does not separately label Plumbing or Project documentation. No issuer statement resolving the difference was found, and the chart is not claimed to supersede the handbook.
Official Reference Map
The handbook points to three references. The handbook's selected review pages supplement the complete references and do not establish exhaustive exam coverage, so do not treat any highlighted-page list as the full syllabus.
- ACAC Code of Conduct (acac.org/conduct): additional required knowledge outside the nine chart lines.
- EPA, Moisture Control Guidance for Building Design, Construction and Maintenance (December 2013): a public document. Read it alongside Domains 1 through 7, where it covers building-science context for water, assemblies and mechanical systems.
- Ken Larsen et al., Leadership in Restorative Drying, fourth edition (2014): the structural-drying text, central to Domain 8. A linked vendor page calls the book a 2014 Gold Edition; equivalence with the handbook's fourth-edition label should not be assumed, so confirm the edition ACAC expects.
For a study plan built around these sources, read CMCC Study Guide 2026.
Exam-Day and Remote-Proctoring Checklist
Delivery is at a testing center or by online video proctoring. Online candidates must supply:
- A computer
- An approved webcam
- A private location
- A continuous 2 Mbps upload/download connection
The exam is closed book. Question and answer order is randomized, so you cannot memorize a position pattern, and results appear immediately. Run your equipment and connection checks well before test day, since a connection that cannot hold 2 Mbps continuously is a real risk for a three-hour session.
Pass Rate and Salary: What You Can and Cannot Claim
Pass rate
ACAC's 2025 exam pass ratio is 0%, from 0 passes on 1 examination. A single examination cannot establish typical difficulty, and the report includes retakes and state-licensing-only examinations. Do not read it as "the exam is nearly impossible" or as a benchmark of any kind. Read CMCC Pass Rate 2026 and How Hard Is the CMCC Exam? for context.
Salary and ROI
There is no verified figure in ACAC's materials tying this certification to a salary premium. Evidence about moisture-consulting roles shows professional interest from service and inspection businesses, but that is different from proof the credential raises pay. Any article quoting a precise "CMCC salary bump" is assuming it. For a careful treatment, see CMCC Salary Guide 2026 and Is the CMCC Certification Worth It?.
Key Takeaway
Treat third-party claims about scarcity, hiring demand or simplified eligibility with caution. Only ACAC's handbook, application and fee pages define current requirements.
A Domain-Ordered Study Sequence
This is the one methodology section, and it is organized by dependency: water science first, because every later domain assumes it.
Science of Water
- Read the EPA guidance end to end for context
- Work capillary action and vapor behavior until you can explain them without notes
Site Drainage and Foundations
- Trace water from site grading to foundation symptoms
- Practice linking a visible interior symptom to an exterior cause
Assemblies, Roofs and Envelope
- Cover walls, ceilings, floors, roofs and envelope assemblies together
- Practice distinguishing envelope intrusion from interior sources
Plumbing and HVAC
- Study both as moisture sources and as drying tools
- Keep Plumbing as its own topic despite the handbook's grouping
Structural Drying and Project Documentation
- Work through the prescribed drying text
- Practice writing findings and specifications defensibly
- Review the ACAC Code of Conduct
Timed Practice
- Take timed sets under the 90-seconds-per-question pace
- Revisit your weakest domain; use the CMCC practice test to find gaps
Scenario thinking matters throughout: the strongest preparation connects water science to diagnosis, specifications and documentation, rather than memorizing isolated definitions. For more on structured preparation, see CMCC Training, and for the career side, CMCC Jobs.
FAQ
The exam has 120 multiple-choice questions, each with at least four answer choices, and you have three hours. It is closed book.
The passing criterion is 75%, set by the certification board using modified Angoff. Results are immediate. See the passing score guide for detail.
The initial US/Canada fee is USD 500: USD 100 for the examination plus USD 400 for certification covering the first two-year term. The current application quotes USD 525 outside the US/Canada. A retake costs USD 100, and renewal costs USD 400.
Renewal requires USD 400 and 40 RCs every two years: 10 for continued field activity and 30 professional-development hours under current procedures. Keep records in case of audit.
No. ACAC publishes nine unweighted domain lines and no percentage weights or per-domain question allocations, so plan to study every domain, plus the Code of Conduct. Start with the practice test to see where you stand.