- CMCC here means Council-certified Moisture Control Consultant, issued by the American Council for Accredited Certification (ACAC).
- The exam is 120 multiple-choice questions in three hours, closed book, with a 75% passing criterion.
- Eligibility combines education with documented moisture-control consulting experience: eight, six, or four years depending on your route.
- The certification lasts two years; renewal requires 40 RCs and a USD 400 fee.
What CMCC Means Here
The acronym CMCC is crowded. It is used by a chiropractic college, in climate research, in medical contexts, and in the building trades for a contractor-level moisture credential. This article is about exactly one of them: the Council-certified Moisture Control Consultant, a professional certification for people who diagnose and document moisture problems in buildings and specify how they should be corrected.
If you landed here looking for another credential that shares the letters, nothing below applies to it. The certifying body, exam, eligibility rules, and fees described in this guide belong only to the moisture-control consultant certification. For other phrasings of the same question, see our explainers on what CMCC stands for and CMCC meaning.
Who Issues the Credential
The certification is issued and administered by the American Council for Accredited Certification (ACAC). Certification decisions are made by ACAC's CMCC Certification Board, which reviews applications and sets the exam's passing criterion. Exam delivery is handled by a testing provider, Kryterion, Inc.
That division of roles is useful to know when something goes wrong. Questions about eligibility, project sheets, or your certification status go to ACAC and its board. Questions about scheduling, proctoring, or technical problems at the testing stage involve the testing provider.
ACAC also keeps certification separate from any licensing-only use of an examination. Passing an exam that a state uses for licensing is not the same thing as earning the Council-certified credential, and that distinction affects how pass statistics should be read (more on that below).
Exam Format and Delivery
The CMCC examination is straightforward in structure:
- 120 multiple-choice questions, each with at least four answer choices
- Three hours to complete the exam
- Closed book: no reference materials during the test
- Passing criterion of 75%, set by the certification board using a modified Angoff method
- Randomized question and answer order, with immediate results
The modified Angoff method is a standard-setting process in which subject-matter experts judge how a minimally qualified candidate would perform on each item. In practice, it means the 75% criterion reflects a judgment about competence rather than a curve against other test-takers. For more on scoring, read our guide to the CMCC passing score.
Testing center or online proctoring
Candidates can test at a testing center or online with video proctoring. Online candidates must supply their own computer, an approved webcam, a private location, and a continuous 2 Mbps upload and download connection. Treat those as hard requirements rather than suggestions: a marginal connection or a shared room can derail a three-hour closed-book exam. Run any system check the testing provider offers well before exam day, and choose a space where you will not be interrupted.
Scheduling windows and deadlines are covered in CMCC exam dates.
The Nine Examination Domains
ACAC's examination objectives, approved March 6, 2024, list nine domains. The chart is unweighted: ACAC does not publish percentage weights or per-domain question counts, so you cannot responsibly skip a domain on the theory that it is lightly tested. The nine domain lines are:
- The Science of Water
- Site Drainage
- Foundations
- Walls, ceilings, and floors
- Roofs and building envelope assemblies
- Plumbing
- HVAC
- Structural Drying
- Project documentation
Notice the shape of the list. It runs from fundamental physics, through the building from the ground outward and upward, into the mechanical systems, and ends with drying and the paperwork that proves the work. That is also roughly how a real moisture investigation unfolds.
Domain 1: The Science of Water
The conceptual foundation for everything else. Candidates should be comfortable reasoning about how water behaves in and around buildings.
- Capillary action and how it moves liquid water through porous materials
- How moisture moves between materials and air
- Why identical-looking damage can have very different causes
Domains 2 and 3: Site Drainage and Foundations
Many interior moisture complaints start outside. These domains test whether you can trace water back to grading, drainage, and the below-grade structure.
- How site conditions direct water toward or away from a building
- How foundation types interact with groundwater and surface water
- Linking a basement or crawlspace symptom to an exterior cause
Domains 4 and 5: Walls, Ceilings, Floors, and Roofs and Envelope Assemblies
The building envelope and interior assemblies are where water gets in, gets trapped, or dries out.
- How assemblies are layered and where those layers can fail
- Roof and envelope paths for water entry
- Reading a damage pattern on a ceiling or wall back to its source
Domains 6 and 7: Plumbing and HVAC
Building systems are both common moisture sources and moisture-control tools.
- Supply, drain, and fixture-related leaks and how they present
- How HVAC operation affects humidity, condensation, and drying conditions
- Distinguishing a system-caused problem from an envelope-caused one
Domains 8 and 9: Structural Drying and Project documentation
The applied end of the credential: dry the building correctly, then prove what you found and did.
- Drying strategy and how it connects to the diagnosis that preceded it
- Specifications and records that make a project defensible
- Documentation as a professional deliverable, not an afterthought
A grouping discrepancy to be aware of
ACAC's candidate handbook lists eight headings in total: seven technical headings plus the ACAC Code of Conduct. Its grouping differs from the dated nine-domain chart, and the handbook 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.
The reference materials behind the exam
The handbook names three references: the ACAC Code of Conduct; the EPA's Moisture Control Guidance for Building Design, Construction and Maintenance (December 2013), which is publicly available; and Ken Larsen et al., Leadership in Restorative Drying, fourth edition (2014). The handbook's selected review pages supplement reading the full references; they do not establish that the exam covers only those pages. Plan to read the complete prescribed materials. One caution on the book: ACAC links to a vendor description that calls it a 2014 Gold Edition, so confirm you are using the edition the handbook names rather than assuming any version is equivalent. For a structured reading plan, see the CMCC study guide.
Eligibility Routes and Application
CMCC is an experience-gated credential. You qualify through one of three routes, each pairing education with documented moisture-control consulting experience:
| Education | Additional requirement | Documented consulting experience |
|---|---|---|
| High-school diploma or GED | None beyond the diploma | Eight years |
| Qualifying two-year degree or equivalent | 15 qualifying credits | Six years |
| Qualifying four-year degree or equivalent | 30 qualifying credits | Four 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, followed by unanimous review by the certification board. The handbook also requests employer affidavits, and applicants complete an electronic affidavit and required email verifications.
The four project sheets are the heart of the application, so start documenting your projects early. For a fuller walkthrough, see CMCC requirements. Keep the consultant track distinct from CMCI in your planning; the eligibility and application details here apply to the consultant certification.
Fees, Renewal, and Recordkeeping
The initial fee for US and Canada applicants is USD 500, made up of a USD 100 examination fee plus a USD 400 certification fee covering the first two-year term. The current official application quotes USD 525 outside the US and Canada. A retake costs USD 100.
Keep issuer fees separate from your other expenses. A prep course is optional, and books, courses, and practice materials are costs you choose and pay separately from ACAC's fees. When budgeting, list the two groups side by side. Our CMCC certification cost breakdown walks through the full picture.
Staying certified
The certification is valid for two years. Renewal costs USD 400 and requires 40 RCs: 10 for continued field activity plus 30 professional-development hours under current procedures. Retain your records, because they can be audited. Build the habit from day one of a term: log training, field work, and supporting documents as they happen rather than reconstructing them at the deadline.
Pass Rate and Salary: Reading the Evidence Carefully
What the pass-rate report actually says
ACAC's 2025 exam pass ratio report shows 0% (0 passes from 1 examination). Do not read that as evidence that the exam is nearly impossible. A single examination cannot establish typical difficulty, and the report also includes retakes and state-licensing-only examinations, so its scope is broader than first-time CMCC certification candidates. The honest conclusion is that this dataset is too thin to guide your expectations. We unpack the details in CMCC pass rate and offer a qualitative view in how hard the CMCC exam is.
Salary and return on investment
There is no reliable published figure in the sources for this certification's salary premium, so this article does not quote one. What can be said is qualitative. Moisture-control consulting is a real professional role, and adjacent businesses such as inspection and building-science firms discuss credentials and moisture expertise publicly. But interest in a field is not proof that a certification raises pay, and some marketing claims (scarcity of credentialed consultants, simplified hiring paths) do not establish current issuer requirements or market demand. When weighing the cost and the multi-year experience requirement, separate evidence about moisture-consulting roles from any assumed certification premium. Our CMCC salary guide and ROI analysis apply that distinction.
A Domain-Ordered Study Plan
Because ACAC does not publish domain weights, sequence your study by how the subject builds on itself rather than by guessing at emphasis. The timeline below follows the water-to-documentation arc of the domain chart and assumes you are also reading the EPA guidance and the structural-drying text across the weeks.
Science of Water, Site Drainage, Foundations
- Master capillary action and moisture movement first; every later domain assumes it
- Trace interior symptoms back to exterior grading and below-grade causes
- Begin the EPA guidance, reading for how it frames building moisture
Walls, ceilings, floors, Roofs and envelope assemblies
- Practice reading damage patterns and linking them to assembly layers
- Compare roof and envelope entry paths against interior symptoms
Plumbing and HVAC
- Separate system-caused moisture from envelope-caused moisture
- Study how HVAC operation shapes humidity and drying conditions
Structural Drying, Project documentation, Code of Conduct
- Work through the drying text and connect drying strategy to diagnosis
- Practice writing specifications and records as if for an auditor
- Read the ACAC Code of Conduct and take timed, closed-book practice sets
Eight weeks is a planning assumption, not an ACAC recommendation; stretch or compress it to fit your experience. Finish with timed, closed-book sets that mirror the real format, and use our CMCC practice test to check which domains still cause errors. The one-page review helps with last-day recall.
Key Takeaway
Treat the nine-domain chart as your checklist and the handbook's eight headings as a cross-check. Cover Plumbing, Project documentation, and the Code of Conduct explicitly so a grouping difference never leaves a gap.
A word of caution on third-party practice material: a document labeled "CMCC" is not necessarily about this credential. Public previews on one document marketplace showed a CMCC-titled listing covering financial statements and transaction analysis, which has nothing to do with moisture control. Check any practice question against the domain list above before trusting it. For purpose-built practice, start at CMCC Exam Prep.
Frequently Asked Questions
It stands for Council-certified Moisture Control Consultant, a certification issued by the American Council for Accredited Certification (ACAC). Other organizations use the same acronym for unrelated things, so confirm the issuer when you see it. See also what CMCC certification is.
The exam has 120 multiple-choice questions with at least four answer choices each, delivered over three hours, closed book. The passing criterion is 75%, set by the certification board using a modified Angoff method.
Yes. Delivery is available at a testing center or online with video proctoring. Online candidates need their own computer, an approved webcam, a private location, and a continuous 2 Mbps upload and download connection.
The initial fee for US and Canada applicants 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 and Canada, and a retake is USD 100. Courses and books are separate expenses.
It is valid for two years. Renewal requires USD 400 and 40 RCs: 10 for continued field activity plus 30 professional-development hours under current procedures. Keep your records in case of an audit.
No. ACAC administers both, but they are separate certifications with their own requirements. This article and its eligibility routes concern the consultant certification only, so verify details separately if you are considering CMCI.