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Exam Review

Key Facts: CRMI Exam

100

Exam Questions (approx.)

ACAC

70%

Passing Score (approx.)

ACAC

15 L/min

Air-O-Cell Standard Flow Rate

IICRC S520

S520

Primary Remediation Standard

ANSI/IICRC

P100

Min Respirator — Heavy Mold (Condition 3)

ANSI/IICRC S520

72 hrs

Water → Mold Risk Threshold

IICRC S500/S520

The ACAC CRMI (Council-certified Residential Mold Inspector) is the professional certification for residential mold inspectors issued by the American Council for Accredited Certification (ACAC). It covers mold biology, moisture intrusion, visual inspection, spore trap air sampling (Air-O-Cell at 15 L/min), surface sampling (tape lift, swab, bulk), chain-of-custody, ANSI/IICRC S520 and S500, ASTM D7338, PPE requirements, documentation, and client communication. Some states (New York, Pennsylvania) require additional state licensing/registration for mold inspection businesses.

Sample CRMI Practice Questions

Try these sample questions to review concepts for the CRMI exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which standard is considered the primary reference document for mold remediation practices in the United States?
A.ASTM D7338
B.ANSI/IICRC S520
C.OSHA 29 CFR 1910.1200
D.EPA 402-K-02-003
Explanation: ANSI/IICRC S520 (Standard for Professional Mold Remediation) is the industry consensus standard that defines protocols for mold remediation, including assessment, containment, removal, and clearance. It is the primary reference for remediation contractors and inspectors across the U.S.
2During a residential mold inspection, a pin-type moisture meter reads 20% moisture content in a drywall panel. This reading most likely indicates:
A.Normal moisture levels for interior drywall
B.Elevated moisture that warrants further investigation
C.The panel is saturated and must be demolished immediately
D.The meter is malfunctioning because drywall cannot absorb moisture
Explanation: Drywall is generally considered dry at 0–1% MC (gypsum core) and at risk above roughly 1% with the pin meter reading relative WME. A reading of 20% WME in drywall indicates elevated moisture that warrants further investigation including probing adjacent areas, checking for vapor barriers, and potentially collecting samples to assess mold risk.
3Which mold species is commonly referred to as 'black mold' and is associated with water-damaged cellulose materials such as drywall and ceiling tiles?
A.Cladosporium sphaerospermum
B.Aspergillus niger
C.Stachybotrys chartarum
D.Alternaria alternata
Explanation: Stachybotrys chartarum (also known as Stachybotrys atra) is colloquially called 'black mold' due to its dark greenish-black color. It thrives on cellulose-rich materials (drywall paper, ceiling tiles, wood) that have been wet for prolonged periods (> 72 hours). It is a hydrophilic mold requiring very high sustained moisture.
4An inspector uses an infrared camera during a mold assessment. The primary purpose of thermal imaging in this context is to:
A.Directly detect mold colonies behind building materials
B.Identify surface temperature anomalies that may indicate moisture intrusion
C.Measure the concentration of mold spores in the air
D.Determine the species of mold present in wall cavities
Explanation: Infrared cameras detect surface temperature differences caused by evaporative cooling from moisture. They do NOT directly see mold — they reveal wet areas that may support mold growth. An inspector uses IR results to prioritize areas for moisture meter verification and possible sampling.
5Air-O-Cell cassettes are most commonly used for which type of mold sampling?
A.Bulk material sampling
B.Swab surface sampling
C.Spore trap air sampling
D.ERMI dust sampling
Explanation: Air-O-Cell cassettes are spore trap samplers used in air sampling for mold. A calibrated pump draws a known volume of air (typically 75 L at 15 L/min × 5 minutes) through the cassette, impacting particles onto a sticky slide. The cassette is then analyzed by a laboratory using direct microscopy.
6What is the standard flow rate used with an Air-O-Cell cassette during a mold air sample collection?
A.5 liters per minute
B.10 liters per minute
C.15 liters per minute
D.25 liters per minute
Explanation: Air-O-Cell cassettes are designed to be operated at 15 liters per minute (L/min). A standard 5-minute sample at 15 L/min yields a total volume of 75 liters. Deviating from the calibrated flow rate invalidates the sample because lab analysis assumes this specific volume when calculating spores per cubic meter.
7During a visual inspection, a CRMI inspector notices white, powdery deposits on a concrete basement wall near the floor. The inspector should first consider this as:
A.Confirmed mold growth requiring immediate remediation
B.Efflorescence from mineral salts, which is not mold
C.Stachybotrys chartarum in its early sporulation stage
D.Evidence of dry rot fungus requiring structural assessment
Explanation: White powdery deposits on concrete or masonry are typically efflorescence — mineral salts left behind as water evaporates through the masonry. Efflorescence is not mold. While it does indicate a moisture pathway (which could support mold elsewhere), the inspector should not mistake it for mold growth and must visually differentiate the two.
8Which of the following molds is considered xerophilic (able to grow at relatively low water activity) and is frequently found on building materials with minimal moisture?
A.Stachybotrys chartarum
B.Chaetomium globosum
C.Penicillium/Aspergillus species
D.Fusarium oxysporum
Explanation: Many Penicillium and Aspergillus species are xerophilic or moderately xerophilic, capable of growing at water activity levels as low as 0.70–0.80 aw. They can colonize materials with relatively low moisture — such as slightly damp drywall or paper — making them among the most common indoor mold genera encountered by inspectors.
9A tape lift sample is collected from a dark stain on a bathroom ceiling. What type of laboratory analysis is typically performed on tape lift samples?
A.PCR (polymerase chain reaction) gene sequencing
B.Direct microscopy — fungal identification by morphology
C.Culture and sensitivity testing on agar plates
D.GC-MS analysis for mycotoxin quantification
Explanation: Tape lift samples are analyzed by direct microscopy. The tape is adhered to a microscope slide, stained if needed, and examined by an analyst who identifies fungal structures (spores, hyphae, conidia) by morphology. This method provides rapid qualitative identification of what is on the surface.
10When comparing indoor air samples to an outdoor control sample, which situation most strongly suggests an indoor mold problem?
A.Indoor and outdoor spore counts are approximately equal with the same genera present
B.Indoor spore count is lower than outdoor spore count
C.Indoor spore count is significantly higher than outdoor and/or contains genera not present outdoors
D.Outdoor spore count exceeds indoor by 50% with similar genera
Explanation: Under normal conditions, indoor spore concentrations should be equal to or lower than outdoor concentrations, with similar genera present. If the indoor count significantly exceeds the outdoor count and/or contains genera absent outdoors (particularly Stachybotrys, Chaetomium, or elevated Penicillium/Aspergillus), this indicates an indoor mold amplification source that warrants investigation.

About the CRMI Exam

The CRMI credential certifies competency in residential mold inspection including visual assessment, moisture mapping, sampling protocols, laboratory interpretation, and professional reporting per ANSI/IICRC S520.

Exam sponsor: ACAC (American Council for Accredited Certification). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Questions

100 questions

Time Limit

3 hours

Passing Score

70%

Exam / Certification Fees

$350

Exam sponsor website

Reported exam pass rate: Not publicly reported. ACAC does not publish CRMI pass rates Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

~20%

Mold Biology & Identification

Common mold genera (Stachybotrys, Aspergillus, Penicillium, Cladosporium, Chaetomium, Alternaria), growth conditions, water activity

~20%

Moisture Assessment & Intrusion

Pin/pinless moisture meters, infrared thermography, moisture intrusion sources, condensation, crawl spaces, attic moisture

~20%

Sampling Protocols

Air sampling (spore traps, Air-O-Cell, 15 L/min), surface sampling (tape lift, swab, bulk), chain of custody, laboratory interpretation

~20%

Standards & Regulations

ANSI/IICRC S520, ANSI/IICRC S500, ASTM D7338, state licensing (NY Mold Law, PA registration), PPE requirements

~20%

Documentation, Reporting & Professional Conduct

Report writing, chain of custody, client communication, confidentiality, conflict of interest, inspector scope vs remediation

Preparing for the CRMI Exam

What You Need to Know

  • Passing score: 70%
  • Exam length: 100 questions
  • Time limit: 3 hours
  • Exam / certification fees: $350 Official sources

Using Our Practice Resources

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

CRMI: Suggested Study Strategy

1Master the ANSI/IICRC S520 mold condition classifications (Conditions 1, 2, 3) and the PPE requirements for each — these are foundational exam concepts
2Know the Air-O-Cell cassette standard flow rate (15 L/min) and how to calculate sampled volume (15 L/min × 5 min = 75 L)
3Understand indoor-to-outdoor spore count interpretation — elevated indoor counts and genera absent outdoors indicate amplification
4Know the key indicator molds: Stachybotrys (hydrophilic, cellulose, prolonged wetness), Chaetomium (hydrophilic, cellulose), Aspergillus versicolor (sterigmatocystin, water damage)
5Study state regulations — New York Mold Law (Article 32) and Pennsylvania registration requirements appear on the exam
6Understand chain-of-custody requirements and why assessment and remediation must be performed by separate parties

Frequently Asked Questions

What is the CRMI exam?

The CRMI (Council-certified Residential Mold Inspector) exam is administered by ACAC (American Council for Accredited Certification). It tests competency in residential mold inspection including mold biology, moisture assessment, visual inspection methodology, air and surface sampling protocols, ANSI/IICRC S520 standards, PPE requirements, documentation, and professional ethics.

How many questions are on the CRMI exam?

The ACAC CRMI exam contains approximately 100 multiple-choice questions. ACAC does not publicly publish exact question counts, so candidates should verify current exam specifications with ACAC at acac.org.

What is the passing score for the CRMI exam?

ACAC requires approximately 70% to pass the CRMI exam. The exact passing score should be confirmed with ACAC directly, as this may be subject to change.

What are the prerequisites for the CRMI credential?

ACAC requires candidates to complete an approved mold inspection training course and demonstrate relevant experience. Prerequisites include completion of ACAC-approved training and agreeing to the ACAC Code of Ethics. Check acac.org for current specific requirements.

Do I need a state license in addition to the CRMI credential?

In some states, yes. New York requires mold assessors and remediators to hold a license under Article 32 of the NYS Labor Law. Pennsylvania requires mold inspection and remediation businesses to register with the Department of Labor and Industry. Check your state's requirements, as regulations vary significantly.

What topics should I prioritize when studying for the CRMI exam?

Focus on: (1) ANSI/IICRC S520 conditions, remediation categories, and PPE requirements; (2) air sampling protocols including Air-O-Cell cassette use at 15 L/min; (3) common indicator molds — Stachybotrys, Chaetomium, Aspergillus versicolor; (4) indoor-to-outdoor spore count interpretation; (5) chain-of-custody procedures; and (6) professional conduct including separation of inspection and remediation roles.

How long should I study for the CRMI exam?

Most candidates prepare for 60-100 hours over 4-8 weeks. Prioritize mold biology (especially indicator molds and water activity), sampling protocols, IICRC S520 condition classifications, and state regulatory requirements for your jurisdiction. Complete at least 100 practice questions to solidify your knowledge before exam day.