CRIE Cheat Sheet 2026: One-Page Review of Must-Know Facts

The Credential at a Glance

CRIE stands for Council-certified Residential Indoor Environmentalist. It is administered by the American Council for Accredited Certification (ACAC), and certification decisions are made by ACAC's CRIE Certification Board. Kryterion, Inc. is the testing provider. If you want the plain-language background first, see What Is CRIE Certification? or What Does CRIE Stand For?.

This page is a one-sheet review. It compresses the facts you need to recall under time pressure: format, topic allocation, the contaminant content the exam is built around, the fee and renewal mechanics, and the places where published sources disagree. For depth on any single item, follow the links to the longer guides, starting with the CRIE study guide.

Exam Format Card

Two format notes trip people up. First, ACAC's generic examinations page cites a 75-120 question range for its credentials in general, but the exact CRIE handbook specifies 50, and 50 is the number to plan around. Second, third-party practice tools sometimes use their own timers and question banks (a 60-minute mock timer or a 100-question bank, for example). Those are practice settings, not the official exam. For the math behind the cut score, see the CRIE passing score guide.

At 50 questions and a 70% criterion, your working target is 35 correct answers. Two hours for 50 items gives roughly two and a half minutes per question, so pacing is rarely the problem. Content recall is. You can test yourself against that timing on the main CRIE practice test site.

The Five Published Topics and Their Question Counts

ACAC publishes five examination topics for CRIE, along with question allocations. The published allocations are 12 questions each for four contaminant topics and two questions for the Code of Conduct. Percentage weights are not separately published, so treat the counts as the official signal and do not convert them into percentages from memory. The CIE/CIEC chart elsewhere on the handbook page covers different credentials and should be ignored when studying for CRIE. A fuller treatment is in the CRIE exam domains guide.

Contaminant Matrix: Identity, Sources, Health Effects, Reduction

ACAC recommends studying each contaminant in four dimensions: what it is, where it comes from in a home, what it does to health, and how to reduce exposure. That maps directly onto Domains 1 through 4. Build a grid with contaminants down the side and those four columns across the top, then fill it from the EPA pages listed below. The table here shows the structure with the type of recall each row demands; populate the cell contents yourself from the EPA references so the facts you memorize come from the prescribed source.

The prompts above are memory cues, not substitutes for the EPA text. Verify each cell against the corresponding EPA page before treating it as exam-ready. Candidates who rely on unverified numerical claims (ventilation rates, filter ratings and similar) from secondary study documents can import errors, so check any number against a primary source.

The EPA Reading List Behind the Exam

The handbook's prescribed references are the ACAC Code of Conduct plus a set of EPA web resources. The EPA topics are asbestos, biological pollutants, carbon monoxide, formaldehyde, lead, nitrogen dioxide, pesticides, radon, respirable particles, environmental tobacco smoke, combustion products and VOCs. Asbestos appears as two entries pointing to different EPA resources, and formaldehyde and lead each carry an additional EPA resource, which brings the linked EPA pages to 15 in total. All 15 were checked in the research behind this guide.

These are web-based references, not a newly dated 2026 exam version. Page titles and redirects on EPA's site change over time, and a revised title does not mean ACAC has issued a new exam. Group your reading into clusters so related content reinforces itself:

• Combustion gases: carbon monoxide, nitrogen dioxide, combustion products, respirable particles and environmental tobacco smoke overlap heavily in sources and controls.
• Chemical emissions: VOCs, formaldehyde and pesticides share product-selection and ventilation themes.
• Legacy materials: lead and asbestos both center on older housing and on disturbance-driven exposure.
• Soil and moisture: radon and biological pollutants connect to how a house interacts with the ground and with water.

Combustion and radon items deserve extra repetition because they are easy to confuse with each other in answer choices. For a plan that sequences this reading, see the CRIE study guide.

Code of Conduct Quick Facts

The Code of Conduct is published at acac.org/conduct and accounts for two exam questions. It is also an attestation area on the application, so you will read it regardless. One nuance worth remembering: ACAC's Code strongly discourages performing the assessment and the contracting work on the same project, but it does not impose a blanket prohibition. If an ethics question presents a scenario where one person does both, the correct reasoning is about disclosure, conflict management and the strong discouragement, not an automatic ban.

Money, Eligibility and Renewal Numbers

Keep issuer charges separate from optional spending. A prep course is optional, and any course price is a separate purchase from the ACAC fees above. The CRIE certification cost breakdown walks through the full budget.

Eligibility and the application path

Eligibility is tied to employment in indoor environmental investigation per the handbook. The current form's affidavit uses the phrase indoor environmental consulting and adds attestations on legal work status, regulatory compliance and ethics. The steps are: complete the application, sign electronically, complete the required email verification, take the examination, and receive unanimous certification-board review. The current application page expressly exempts CRIE from project sheets, so do not assemble four project sheets on the advice of an older or third-party source. Details are in the CRIE requirements guide, and scheduling mechanics are in the CRIE exam dates guide.

Where Sources Disagree

When two published sources conflict, the safest habit is to follow the most current issuer page and confirm with ACAC before paying or submitting. Known conflicts and how to handle them:

• Time window and verification: The current application page references six months and online/email verification, while the handbook references 90 days and notarized-application wording. Confirm which applies at the time you apply.
• Project sheets: Some preparation providers describe experience as documented with project sheets. The current CRIE application page exempts CRIE from them.
• Pass-rate publication: One practice site states CRIE pass rates are not published. ACAC has a dated 2025 report, discussed below.
• Proctoring: A course provider's categorical third-party-proctor statement should not override the issuer's stated vocational-exam arrangements.
• Topic weights: Practice sites that emphasize sampling, water damage or remediation standards are not following the issuer's EPA-based topics. The five published ACAC topics govern.
• Practice-site overlap: Two reviewed practice sites display an identical first question and answer set, so do not treat them as independent confirmation of each other.

Marketplace listings may also use incorrect expansions of the acronym. They do not redefine this credential. If you are comparing it against other indoor-air credentials, note that CRIE, CIE and CIEC are distinct credentials, and holding one does not imply automatic progression to another.

Reading the 2025 Pass Ratio Correctly

ACAC's 2025 exam pass ratio for this credential is 88%, from 29 passes across 33 examinations. Read that number with its limits attached: the report includes retakes and state-licensing-only examinations, and it describes a single dated cohort. It is not a first-attempt pass probability, and it should not be quoted as one. The sample is also small, so treat it as context rather than a forecast. A deeper discussion is in the CRIE pass rate analysis, and for a sense of difficulty independent of that ratio, see How Hard Is the CRIE Exam?.

Scheduling the Five Topics

One short scheduling pass is enough. Because the four contaminant topics are equally weighted and heavily cross-referenced, study by contaminant cluster and then test by domain. A compact sequence:

Exposure reduction goes last because it draws on everything before it: you cannot choose a control measure for a contaminant you cannot identify or source. Adjust the pacing to your own calendar and experience. Hands-on field familiarity with combustion appliances or moisture problems will shorten some weeks and lengthen others.

Frequently Asked Questions

Use this sheet as your final-week checklist, then pressure-test your recall with timed questions on the CRIE practice exam site.