- What CMCC Means Here
- Other Meanings of CMCC You Will Run Into
- Who Issues It and Who Decides
- What a Moisture Control Consultant Actually Does
- The Nine Domains Behind the Name
- Exam Format at a Glance
- Eligibility Routes and Application Mechanics
- Keeping CMCC Separate From CMCI
- The Two-Year Term and Renewal
- A Reading Plan That Follows the Official References
- Frequently Asked Questions
- CMCC here means Council-certified Moisture Control Consultant, issued by the American Council for Accredited Certification (ACAC).
- The exam is 120 multiple-choice questions, three hours, closed book, with a 75% passing criterion.
- Eligibility combines education and documented moisture-control consulting experience, ranging from four to eight years.
- The initial US/Canada fee is USD 500; the certification term runs two years and renews for USD 400 plus 40 RCs.
What CMCC Means Here
On this site, CMCC stands for Council-certified Moisture Control Consultant. It is a professional certification for people who diagnose, specify and document moisture problems in buildings. The credential is administered by the American Council for Accredited Certification (ACAC), and the word "Council" in the title refers to that body.
The name is worth reading literally, because each word tells you something about the credential:
- Council-certified: the credential comes from a certifying council, with decisions made by the ACAC CMCC Certification Board rather than by a training vendor.
- Moisture Control: the subject is water in and around buildings, covering where it comes from, how it moves, and how to stop or remove it.
- Consultant: the role is advisory and diagnostic. The credential is built around evaluating conditions, writing specifications and documenting projects, which is why eligibility is tied to documented consulting experience.
If you want the shorter explainers, we also cover what CMCC stands for, what a CMCC is, and the broader CMCC certification overview. This article focuses on the meaning of the name and what stands behind it.
Other Meanings of CMCC You Will Run Into
CMCC is a crowded acronym. A quick web search for it returns material that has nothing to do with moisture control, and candidates sometimes land on the wrong page. To keep the identity clear, here is how this credential differs from other uses of the letters:
| Where you may see "CMCC" | Relationship to this credential |
|---|---|
| Chiropractic-college uses | Unrelated. Not a moisture-control credential. |
| Climate-research uses | Unrelated. Not a certification issued by ACAC. |
| Medical uses | Unrelated. Different field entirely. |
| Certified Moisture Control Contractor | A similar-sounding contractor-oriented title. Do not treat its requirements as those of the consultant credential. |
| Council-certified Moisture Control Consultant | The subject of this site: ACAC-issued, 120-question exam, nine official domains. |
Who Issues It and Who Decides
ACAC administers the certification, and certification decisions are made by its CMCC Certification Board. Exam delivery is handled by a testing provider, Kryterion, Inc. This split matters: the board decides who is certified, the testing provider delivers the exam, and a prep course or book vendor has no role in either decision.
The board sets the passing criterion using a modified Angoff method, a standard-setting process in which subject-matter judgments about minimally competent candidates inform the cut score. The result is a 75% passing criterion. For a deeper look at that number, see our guide to the CMCC passing score.
What a Moisture Control Consultant Actually Does
The credential makes more sense when you picture the work. A moisture control consultant is typically brought in when water has caused, or threatens to cause, damage or indoor-environment problems. The consultant's value is in tracing the problem to its source and putting the findings on paper in a form others can act on.
That work usually moves through a chain of reasoning that the exam domains mirror:
- Understand how water behaves. Liquid, vapor and capillary movement explain why a problem appears where it does, often far from where the water entered.
- Trace the source. Site drainage, foundations, building assemblies, roofs, plumbing and HVAC are the usual suspects.
- Specify the remedy. That may include correcting a drainage condition, repairing an assembly, or planning structural drying.
- Document the project. Findings, decisions and results need to be recorded clearly.
Employers and clients for this kind of work are adjacent professional sectors: restoration and drying contractors, building and property inspection firms, and mold and indoor-environment practices. Public pages from such businesses show interest in building-science credentials, but they do not establish current issuer requirements or measure market demand, so treat them as context rather than proof. Our CMCC jobs article looks at the employment side in more detail.
The Nine Domains Behind the Name
ACAC's dated examination chart (approved March 6, 2024) lists nine Domain lines as official examination objectives. The chart is unweighted, so ACAC publishes no percentage weights or per-domain question counts. Plan your study without assuming any domain is worth more questions than another.
Domain 1: The Science of Water
The foundation for everything else. Candidates need fluent command of how water moves and changes state.
- Capillary action and why it pulls water into porous materials
- Vapor movement versus bulk liquid movement
Domains 2 and 3: Site Drainage and Foundations
Water management starts outside the building. These domains cover how grading, drainage and below-grade construction either shed water or deliver it to the structure.
- Linking site conditions to symptoms inside the building
- Foundation moisture pathways
Domains 4 and 5: Walls, Ceilings and Floors; Roofs and Building Envelope Assemblies
The assemblies that separate inside from outside. Questions here tend to reward reasoning about how layers behave together rather than recalling a single fact.
- How leaks and condensation show up within assemblies
- Roof and envelope contributions to interior moisture
Domains 6 and 7: Plumbing and HVAC
Mechanical systems are both water sources and moisture-control tools. A supply line failure and an undersized or poorly operating air system can each create conditions a consultant must diagnose.
- Distinguishing a plumbing source from an envelope source
- How HVAC operation influences indoor moisture
Domain 8: Structural Drying
The remediation domain, covering how wet buildings and materials are dried. The handbook pairs this with a prescribed structural-drying text, discussed below.
Domain 9: Project Documentation
The consultant's output. Good diagnosis that is poorly recorded loses most of its value, so expect questions about what documentation should capture.
For a domain-by-domain breakdown, see our complete guide to the nine CMCC content areas.
Exam Format at a Glance
| Feature | Detail |
|---|---|
| Questions | 120 multiple choice, 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 with video proctoring |
| Randomization | Question and answer order randomized |
| Results | Immediate |
| Retake fee | USD 100 |
Taking it online
Online candidates supply their own computer, an approved webcam, a private location and a continuous 2 Mbps upload and download connection. Test your setup well before exam day rather than discovering a webcam or bandwidth problem while the clock is running.
What difficulty really looks like
ACAC's 2025 exam pass ratio document reports 0% based on 0 passes from 1 examination. That is a single-examination cohort, and one attempt cannot establish typical difficulty. The report also includes retakes and state-licensing-only examinations, so it does not isolate first-attempt certification candidates. Read our CMCC pass rate analysis and difficulty guide for how to interpret this responsibly.
Eligibility Routes and Application Mechanics
Eligibility is not an exam-only gate. Applicants must document experience in moisture-control consulting, and the amount of experience depends on education:
| Route | Education | Documented experience |
|---|---|---|
| 1 | High-school diploma or GED | Eight years |
| 2 | Qualifying four-year degree or equivalent, 30 qualifying credits | Four years |
| 3 | Qualifying two-year degree or equivalent, 15 qualifying credits | Six years |
Qualifying education is in relevant science, engineering, architecture, industrial hygiene or related fields. The application package includes four project sheets, applicable transcripts and application verifications. Applicants complete an electronic affidavit and required email verifications, and the handbook also requests employer affidavits. The certification board then reviews the file, and approval requires unanimous board review.
Key Takeaway
ACAC's own sources disagree on some application details. The current application page describes six months and online or email verification, while the handbook describes 90 days and notarized application and employer-affidavit instructions. Board meeting frequency is also described differently, every four to six weeks on the application page and approximately every four weeks in the handbook. Confirm current instructions directly with ACAC before you submit.
Our CMCC requirements guide walks through qualification step by step, and CMCC exam dates covers scheduling.
What it costs
The initial US/Canada fee is USD 500, made up of USD 100 for the examination and USD 400 for certification covering the first two-year term. The current official application quotes USD 525 outside the US and Canada. A retake costs USD 100. A prep course is optional, and course or book expenses are separate from issuer fees, so budget them separately. The full picture is in our CMCC certification cost breakdown.
Keeping CMCC Separate From CMCI
ACAC publishes the CMCC and CMCI examinations in the same domains document, which is one reason candidates blur them together. The consultant credential discussed here has its own eligibility routes, its own four-project application guidance and its own handbook section. Do not assume that requirements, education equivalents or application steps for the inspector-oriented credential apply to the consultant credential, and do not borrow one set of requirements for the other. When reading ACAC materials, confirm which credential a given passage addresses.
The Two-Year Term and Renewal
Certification is valid for two years. Renewal costs USD 400 and requires 40 RCs. Under current procedures those are made up of 10 for continued field activity plus 30 professional-development hours. Retain your records, because they may be requested in an audit. Treat recordkeeping as a habit from the day you are certified, not a scramble in month 23.
Certification also remains separate from any licensing-only examination use. Passing an exam used for state licensing is a different matter from holding the ACAC credential.
A Reading Plan That Follows the Official References
The handbook points candidates to three references, and the exam is built on the objectives, not on any one summary. A sensible reading map looks like this:
- EPA Moisture Control Guidance for Building Design, Construction and Maintenance (December 2013): a public document that maps well to site drainage, foundations, assemblies, plumbing and HVAC.
- Leadership in Restorative Drying (Ken Larsen et al., fourth edition, 2014): the prescribed structural-drying text, the natural anchor for Domain 8. Note that a vendor page linked by ACAC describes a 2014 Gold Edition, and equivalence with the handbook's fourth-edition label should not be assumed, so confirm the correct edition before buying.
- ACAC Code of Conduct: additional required knowledge that sits alongside the nine chart domains.
The handbook's selected review pages supplement the full prescribed references and do not establish exhaustive exam coverage, so do not treat highlighted pages as the whole syllabus.
One way to sequence the domains
Science of Water, then outside the building
- Start with Domain 1 so later domains have a foundation
- Move to Site Drainage and Foundations using the EPA guidance
Assemblies and systems
- Walls, ceilings and floors; roofs and envelope assemblies
- Plumbing and HVAC, practicing source-versus-symptom reasoning
Remediation, records and ethics
- Structural Drying with the prescribed text
- Project Documentation and the Code of Conduct, then timed practice
Our CMCC study guide expands on this, and the CMCC cheat sheet offers a quick final review. When you are ready to test yourself, the CMCC practice tests let you drill scenario questions across the nine domains.
Frequently Asked Questions
It stands for Council-certified Moisture Control Consultant, a credential issued by the American Council for Accredited Certification (ACAC). It is distinct from other uses of the same letters in medical, academic and climate-research contexts.
The ACAC CMCC Certification Board makes certification decisions, reviewing the application file and requiring unanimous approval. Kryterion, Inc. provides exam testing, but it does not decide certification.
The exam has 120 multiple-choice questions with at least four answer choices, a three-hour limit and a closed-book format. The passing criterion is 75%, set by the board using modified Angoff.
No. A high-school diploma or GED works with eight years of documented moisture-control consulting experience. A qualifying degree or equivalent credits reduces the required experience to four or six years depending on level.
That depends on your career goals. Evidence about moisture-consulting roles should be kept separate from any assumed certification salary premium, which is not established here. See our ROI analysis and salary guide for a careful treatment.
For related explainers, see What Is CMCC?, What Does CMCC Mean? and CMCC training.