- What ACAC's Published Pass Figure Actually Says
- Why a Sample of 15 Exams Limits Conclusions
- Who Sits the Exam: Eligibility Filters the Candidate Pool
- Format and Standard: 120 Questions, 3 Hours, 75%
- Where Candidates Are Most Likely to Lose Points
- A Domain-Sequenced Preparation Plan
- Retake Mechanics and the Real Cost of a Miss
- Who Hires CFST Holders
- Frequently Asked Questions
- ACAC's 2025 Exam Pass Ratio reports 66%: 10 passes out of 15 examinations.
- That figure includes retakes and state-licensing-only exams, so it is not a first-attempt pass rate.
- The exam is 120 multiple-choice questions in 3 hours, with a 75% passing score set by modified Angoff.
- A retake costs $100, while the first two-year term costs $500 in the US/Canada.
What ACAC's Published Pass Figure Actually Says
If you search for the Council-certified Fire and Smoke Damage Technician pass rate, the only authoritative number comes from the issuer itself. The American Council for Accredited Certification (ACAC) publishes a 2025 Exam Pass Ratio report showing 66%, based on 10 passing results out of 15 examinations. That is the figure printed by the issuer, and it is the figure this article uses.
Read it carefully, though. The report does not isolate first-time CFST candidates. It includes retakes, and it includes people who sat the exam solely for state-licensing purposes rather than to earn the CFST designation. So "66%" describes a mixed bag of examination events, not the odds that a well-prepared first-time applicant will pass.
For a broader look at how difficult candidates find the test, see our CFST difficulty guide. For the cut score itself, the CFST passing score breakdown covers what 75% means in practice.
Why a Sample of 15 Exams Limits Conclusions
Fifteen examinations is a very small sample. With a base that size, a single additional pass or fail moves the headline figure by several percentage points. Ten of fifteen is 66%; eleven of fifteen would be roughly 73%; nine of fifteen would be 60%. The number is a snapshot of one reporting year, and it will swing.
That has practical consequences for how you interpret the data:
- Do not treat 66% as a stable probability. It is a descriptive count for a small cohort.
- Do not compare it directly with large-volume exams. Credentials with thousands of annual candidates produce stable rates; this one does not.
- Do look at the structure behind it. The cut score, the exam format, and the eligibility gate tell you more about difficulty than a one-year ratio does.
The small volume also reflects the specialized nature of the field. Fire and smoke damage investigation is a niche discipline, and the exam draws a correspondingly narrow audience.
Who Sits the Exam: Eligibility Filters the Candidate Pool
You cannot simply register and test. ACAC screens applicants first, and that screening shapes who ends up in the pass-ratio denominator. Under the eligibility rules, you need one of two pathways:
- A qualifying science-related two-year degree (or its 15-credit equivalent) plus one year of documented fire/smoke investigation experience; or
- A high-school diploma or GED plus two years of documented experience.
The experience has to be real fire and smoke work. The handbook accepts experience designing, conducting, or reporting investigations of combustion-product damage. Unrelated water-damage, microbial-growth, asbestos, lead, and other indoor environmental investigations do not qualify. Applicants also submit four project sheets, applicable education transcripts, and required email verifications, and certification requires unanimous board approval.
Because candidates arrive with documented field experience, the people sitting the exam are generally practitioners, not newcomers. That is one reason the pass ratio should not be compared with entry-level exams. Our CFST requirements guide walks through the application in detail, and the exam dates and scheduling article covers timing.
One more distinction matters: passing the exam for state licensing alone does not confer the CFST designation. Some candidates take the test for licensing, which is exactly why the pass-ratio report mixes populations.
Format and Standard: 120 Questions, 3 Hours, 75%
The exam is a closed-book written examination: 120 multiple-choice questions, each with at least four answer choices, and a 3-hour time limit. That works out to a little over a minute and a half per question, which is comfortable if you know the material and tight if you are reasoning from scratch on every item.
| Exam Feature | CFST Detail |
|---|---|
| Issuer | American Council for Accredited Certification (ACAC) |
| Questions | 120 multiple-choice, at least four options each |
| Time limit | 3 hours, closed book |
| Passing score | 75%, set using the modified Angoff method |
| Delivery | Kryterion: testing center or online video proctoring |
| Score reporting | Electronic scores available immediately |
| ID at testing centers | Two government-issued IDs, including one photo ID |
The modified Angoff method matters for interpreting pass data. In an Angoff-style standard-setting process, subject-matter experts judge how a minimally competent candidate would perform on each item, and the cut score is derived from those judgments. The passing score reflects a competence standard rather than a quota, which means a pass ratio can rise or fall without the bar moving. Details are in our passing score guide.
Key Takeaway
At 75% on 120 items, you need roughly 90 correct answers. Plan your preparation around consistent accuracy across all five domains rather than perfecting one or two, because the exam does not let strength in one area fully offset gaps in another.
Where Candidates Are Most Likely to Lose Points
ACAC's examination chart (approved March 20, 2024) lists five domains. ACAC does not publish percentage weights in the retrieved chart or handbook, so no one outside the issuer can honestly tell you how many questions come from each domain. What follows is a description of what each domain covers and where practitioners tend to have gaps, not a weighting claim.
Domain 1: General Knowledge
Foundational fire and smoke damage concepts that frame everything else.
- Combustion products and how they behave after a fire event
- Terminology you will be expected to use precisely on a closed-book test
- The scope of what a fire and smoke investigation does and does not address
Domain 2: Site Characterization
Assessing the loss site before and during sampling decisions.
- Documenting conditions and the extent of combustion-product impact
- Identifying affected materials, areas, and building systems
- Forming a defensible picture of the site that drives sampling strategy
Domain 3: Sample Collection
Collecting samples in a way that supports valid conclusions.
- Choosing sample types and locations for combustion-product damage
- Collection technique, handling, and documentation
- Avoiding cross-contamination and other errors that undermine results
Domain 4: Sample Analysis, Data Interpretation & Report Writing
Turning laboratory results into defensible findings.
- Understanding what analytical results can and cannot show
- Interpreting data in the context of the site characterization
- Writing reports that communicate findings clearly and support decisions
Domain 5: Remediation
Translating findings into cleanup and restoration decisions.
- Matching remediation approaches to the damage identified
- Verifying that remediation achieved its objective
- Connecting investigation findings to practical work scopes
Practitioners who live in the field often have strong instincts for Domains 2, 3, and 5 and weaker footing in Domain 4, where formal data interpretation and report-writing conventions are tested. Others know remediation well but have never had to articulate Domain 1 terminology precisely. Self-assess honestly against each domain. For a deeper walk through each area, read our CFST exam domains guide.
A Domain-Sequenced Preparation Plan
No training course is mandatory for this credential, so how you prepare is up to you. ACAC offers a supporting resource, the Council-certified Fire and Smoke Damage (CFSx) Certification Program Exam Study/Review Guide (Rev. 12-2024), which is the natural anchor for your reading. Here is one way to sequence it around the domains, with a rationale for each stage.
Domain 1 and a diagnostic
- Read the ACAC study/review guide's foundational material and build a terminology list
- Take a practice set to find which domains need the most time
Domains 2 and 3
- Study site characterization and sampling together, since sampling decisions flow from the site picture
- Practice scenario questions about what to sample and why
Domain 4
- Give extra time here if analysis and report writing are not part of your daily work
- Work through data-interpretation items and review how findings are documented
Domain 5 and full-length practice
- Tie remediation choices back to the findings from earlier domains
- Sit timed 120-question sessions to confirm you can sustain accuracy across 3 hours
The reasoning for this order: Domains 2 through 5 form a chain from site to samples to data to cleanup, so studying them in sequence reinforces how each step depends on the previous one. Use the CFST study guide for more detail, keep the one-page cheat sheet for final review, and run timed sessions on our practice test platform to build pacing.
Retake Mechanics and the Real Cost of a Miss
Given that the published ratio is far from a guarantee, it helps to know what failing costs. Fees break down this way:
| Item | Cost (USD) |
|---|---|
| Examination fee | $100 |
| Certification fee | $400 |
| First two-year term total (US/Canada) | $500 |
| First two-year term total (outside US/Canada) | $525 |
| Retake | $100 |
A retake is $100, a modest sum compared with the effort of assembling four project sheets, transcripts, and verifications. The costlier risk is the application timeline: with a six-month window in the current instructions (versus the 90 days stated in the handbook), a failed attempt can eat into your remaining time. Confirm the deadline that applies to you before scheduling.
The credential is valid for two years. Renewal costs $400 and requires 40 recertification credits: 10 credits for attesting to continued field activity plus 30 hours of professional development, with documentation retained for possible audit. See the full cost breakdown for planning, and the ROI analysis if you are weighing the investment.
Who Hires CFST Holders
Understanding the job market clarifies why candidates take the exam seriously despite a modest fee. The credential serves professionals who investigate and report on combustion-product damage, so it is most relevant in roles such as:
- Fire and smoke damage consultants and investigators
- Restoration and remediation firms that need defensible assessment of smoke impact
- Environmental and industrial hygiene consulting practices handling fire-loss work
- Insurance-adjacent and claims-support roles that depend on credible damage documentation
Employers value a third-party credential because it signals verified field experience (the application requires documented investigations and board approval) as well as exam-tested knowledge. See the CFST jobs overview and the salary guide for qualitative context on compensation. No earnings figures are cited here because ACAC publishes none.
Frequently Asked Questions
ACAC's 2025 Exam Pass Ratio reports 66%, representing 10 passes out of 15 examinations. This preserves the issuer's printed figure and covers a very small sample.
No. The report includes retakes and state-licensing-only examinations, so it does not isolate first-time CFST certification candidates. No official first-attempt rate is published.
You need 75% on the 120-question, 3-hour, closed-book exam. The cut score is set using the modified Angoff method, a standard-setting process based on expert judgments of minimum competence.
A retake costs $100. Because scores are reported electronically right away, you will know the result immediately. Check your application deadline, since the current instructions allow six months while the handbook states 90 days.
No. Passing the exam for state licensing alone does not confer the CFST designation. You must also meet eligibility requirements, submit four project sheets, and receive unanimous board approval.
The published data tells a limited but honest story: a small cohort, a mixed candidate pool, and a fixed 75% competence standard. Treat 66% as context rather than a prediction, and prepare against the five domains. When you are ready to test your readiness, start with a full-length session on our CFST practice exam site, and review the pass rate data summary again as ACAC releases new reports.