CEAI Passing Score 2026: Exactly What You Need to Pass

The Number: 75% on 100 Questions

The passing score for the Council-certified Environmental Allergen Investigator (CEAI) examination is 75%. The exam consists of 100 computer-delivered, closed-book multiple-choice questions, each with at least four answer options, and you get 3 hours to complete it. Those three facts, the cut score, the question count, and the time limit, define everything about how you should prepare.

The credential is administered by the American Council for Accredited Certification (ACAC), and the exam is delivered by the testing provider Kryterion, Inc. Because the exam is exactly 100 questions, the percentage is easy to translate into a target: you are aiming for a result that clears the 75% line, so every question is worth roughly one percentage point of margin.

Where the 75% Comes From: Modified Angoff

ACAC states that the passing score was established using the Modified Angoff Method. That matters for how you think about the exam. In an Angoff-style standard-setting process, a panel of subject-matter experts reviews exam items and judges how a minimally competent candidate would perform on each one. Those judgments are combined to set the cut score.

The practical consequences for you:

• The standard is criterion-based, not a curve. You are not competing against other candidates on test day. Your result depends on your own performance against the fixed standard.
• The bar reflects minimum competence. The standard describes a candidate who can perform environmental allergen investigation work acceptably, so the questions lean toward practical, defensible knowledge rather than trivia.
• Expect no partial credit tricks. With a fixed 75% line, you need to be consistently correct across the whole exam, not brilliant in one area and weak elsewhere.

For a broader view of how demanding that standard feels in practice, read How Hard Is the CEAI Exam?

What 75% Means in Question Terms

With 100 questions and a 75% passing score, the simple arithmetic is that you need roughly 75 correct answers to meet the standard. One caution: ACAC's reviewed public materials describe the passing score as a percentage and do not break out how many questions might be unscored, so treat "about 75 correct out of 100" as a planning target rather than a guaranteed raw-score rule. If ACAC's candidate communications give you a more specific scoring statement, follow that.

Pacing is generous. Three hours for 100 questions leaves about 108 seconds per question on average, which is enough to read carefully, eliminate distractors, and flag anything you want to revisit. Most missed points at this level come from content gaps, not from running out of time.

Six Domains, No Published Weights

The CEAI exam draws from six official content domains. ACAC's reviewed public sources list the domain headings but do not publish percentage weights, so any article claiming specific percentages for each domain is guessing. Since you cannot know how many of the 100 questions come from each area, the safe strategy is balanced competence. A 75% overall score is hard to reach if one domain is a blind spot.

For a deeper walkthrough of each area, see the CEAI exam domains guide.

The assigned reading list shapes the questions

ACAC's study packet names seven assigned publications, and ACAC recommends reading the complete texts rather than only highlighted review pages. These sources are where the exam's content lives:

• APHL, Environmental Laboratories and Indoor Air Testing: A Primer (2015)
• CDC, Healthy Housing Reference Manual, chapter 5 (2006)
• EPA, Exposure Factors Handbook, chapter 19 (updated 2018)
• Estelle Levetin, Methods for Aeroallergen Sampling, Current Allergy and Asthma Reports 4:376-383 (2004)
• HHS, Airborne Allergens: Something in the Air (2003)
• HUD, Healthy Homes Issues: Asthma (2012)
• HUD, Vacuum Dust Sample Collection Protocol for Allergens (2008)

Note that the years listed are publication years of the references, not exam-release dates. Reading the full texts matters because a 75% standard rewards candidates who understand sampling protocols and exposure concepts in context, not just memorized fragments. Our CEAI study guide maps these readings to a preparation sequence.

Exam Format, Delivery, and Immediate Scoring

You can take the CEAI exam either at a test center or through secure online video proctoring, both delivered through Kryterion. Because the exam is closed-book, no reference materials are available to you in either setting.

Your score is delivered immediately when you finish, with an email confirmation. There is no multi-week wait to learn whether you reached 75%.

For scheduling windows and deadlines, see CEAI exam dates and scheduling.

Reading the 50% Historical Pass Ratio Carefully

ACAC's Accredited Certification Activity summary, current as of December 31, 2025, reports a CEAI examination pass ratio of 50%, with two applicants in 2025 and one current certification at that date. It is tempting to treat that as a pass rate and plan around it. Don't.

• The sample is tiny. Two applicants cannot support any conclusion about difficulty. One outcome flipping would change the ratio dramatically.
• It is not a first-attempt rate. The report does not separate first-time from repeat candidates.
• Totals can include licensing-only candidates, so the figure may not reflect the population sitting this exam for certification.
• It is historical, not predictive. It says nothing reliable about 2026 results.

The takeaway: the 75% cut score is the number that actually governs your outcome. For more on how to interpret the limited data, read CEAI pass rate: what the data shows.

Fees, Retakes, and Conflicting Deadlines

ACAC's fee page lists a USD 100 examination component that is separate from certification charges, and a USD 100 retake. Its general accredited-certification schedule lists USD 500 initially (USD 400 certification plus USD 100 examination) and USD 400 per two-year renewal.

Important caveat: these are published category rates, not a separately verified CEAI-specific quotation. The credential-specific application page did not render during our review, so confirm your exact total with ACAC rather than assuming the general schedule applies unchanged. Our CEAI certification cost breakdown covers how to budget around this uncertainty.

The deadline conflict

The application page gives a six-month completion allowance that includes the exam, while the handbook states a 90-day rule. These conflict. Before you pay anything, ask ACAC which deadline applies to your application, then schedule your exam inside the shorter window to be safe. Missing a deadline could cost you fees and time, and it is a more avoidable way to fail than missing the 75% line.

Because a retake carries a listed fee, a first-attempt pass saves money, but retakes are an option if you fall short. Treat your first sitting as a real attempt, not a trial run.

A Domain-Ordered Plan Built Around the Cut Score

Because weights are unpublished, spread effort across all six domains, but sequence them so the knowledge builds. Domains 1 through 3 give you the vocabulary; Domains 4 and 5 are where scenario questions will test judgment; Domain 6 ties it together.

Use full-length timed practice to confirm you are consistently above 75% before booking. You can find practice questions on the CEAI practice test site, and the CEAI cheat sheet is useful for a final review of key facts.

Eligibility and Verification Items to Settle Before Test Day

Passing the exam is only one of several separate certification requirements. ACAC lists experience verification, the examination, and unanimous board approval as distinct steps, and there is no mandatory training course.

Two eligibility paths are described:

• Education route: a qualifying two-year degree (or ACAC's stated equivalent of 15 credit hours) plus at least one year of documented environmental allergen investigation experience. Qualifying education includes microbiology, engineering, science, architecture, industrial hygiene, or a related science.
• Experience route: no degree, but at least two years of consulting experience in environmental allergen investigations, plus a high-school diploma or GED.

Applicants need experience designing and conducting investigations, and must submit four project sheets, and transcripts if claiming education credit, along with the online application and required email verifications. Full details are in the CEAI requirements guide.

Validity and recertification

The certification is valid for two years. ACAC's current recertification procedures call for 40 RCs per term: 10 for continued field activity plus 30 hours of professional development, with records kept for possible audit. However, the handbook describes 40 education/development hours, and the program overview mentions 20 professional-development hours per year. Confirm the current rule with ACAC before you plan your post-certification activity.

Accreditation status

ACAC describes CEAI and CEAC as CESB accreditation applicants, but the public CESB Members list does not show them. Absence from a list does not settle the question, so current accreditation is unverified. If accreditation matters for your employer or your own resume wording, confirm it with ACAC or CESB before making any claims. For career context, see CEAI jobs and whether the certification is worth it.

Frequently Asked Questions