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100+ Free CMRS Practice Questions

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A CMRS discovers mid-project that the original IEP assessment did not account for mold growth inside a wall cavity that was opened during remediation. What is the correct protocol?

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Sample CMRS Practice Questions

Try these sample questions to test your CMRS exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A Microbial Remediation Supervisor (CMRS) receives an Indoor Environmental Professional (IEP) assessment report before mobilizing a crew. What is the PRIMARY purpose of reviewing the IEP scope before writing the remediation work plan?
A.To determine the insurance claim value for the property owner
B.To understand contamination boundaries, condition classifications, and clearance criteria set by the IEP
C.To select the brand of biocide that will be applied during remediation
D.To schedule the post-remediation verification air sampling date
Explanation: The IEP assessment defines contamination boundaries (Condition 1/2/3), the remediation scope, and the clearance criteria the supervisor must meet. Reviewing it first ensures the work plan aligns with those findings and that clearance will be achievable upon completion.
2Under ANSI/IICRC S520, a surface is classified as Condition 3 when:
A.There is settled spore dust and minor surface mold growth visible only under magnification
B.Actual mold growth is present and the contamination has spread beyond the primary area through the HVAC system or normal air movement
C.A musty odor is detected but no visible mold growth can be identified
D.Air sampling reveals spore counts above Condition 1 baselines in an adjacent unaffected room
Explanation: ANSI/IICRC S520 defines Condition 3 as an indoor environment that has actual mold growth or actual settled mold spores that originated from a Condition 2 or 3 source inside the building, including growth that has spread to secondary areas via air movement or HVAC. This distinguishes it from Condition 2 (contamination limited to a localized area) and Condition 1 (normal fungal ecology).
3When developing a project work plan for a large Condition 3 remediation, which document MUST be created before the crew begins demolition?
A.A completed clearance inspection report signed by the IEP
B.A written remediation work plan that includes scope, containment specifications, PPE levels, and waste disposal procedures
C.A final invoice approved by the property owner
D.OSHA Form 300 listing anticipated injuries
Explanation: ANSI/IICRC S520 and industry best practice require a written remediation plan before work begins on significant projects. This plan must define scope, containment type, worker PPE levels, engineering controls, waste handling, and how post-remediation verification will be conducted. It serves as the supervisor's authoritative reference throughout the project.
4A CMRS is estimating a remediation job that requires removing mold-contaminated drywall from 400 sq ft of wall area and replacing it with new drywall. Which cost component is MOST OFTEN underestimated by new supervisors?
A.Labor hours for debris removal and disposal
B.Cost of negative air machines
C.Hours required to build, maintain, and tear down critical barriers (containment)
D.Cost of replacement drywall materials
Explanation: Containment construction and tear-down — including framing, poly sheeting, tape, HEPA-vacuum of the barrier itself, and disposal — is consistently underestimated by new supervisors. It can account for 15–25% of total labor on a mid-sized job. Underestimating it leads to schedule overruns and margin erosion.
5Which of the following BEST describes the role of the CMRS relative to Council-certified Microbial Remediators (CMRs) on a project?
A.The CMRS performs all technical work while CMRs handle administrative duties
B.The CMRS supervises, directs task assignments, conducts quality control audits, and ensures CMRs follow the work plan and S520 standards
C.The CMRS is responsible only for post-remediation verification and has no on-site authority over CMRs
D.The CMRS and CMRs share equal authority and any crew member can modify the work plan
Explanation: The CMRS credential signifies supervisory authority. A CMRS assigns tasks to CMR-level workers, conducts ongoing quality control audits of their work, intervenes to correct deficiencies, and is accountable for the overall project conformance to the written work plan and ANSI/IICRC S520.
6A supervisor discovers that a CMR on the crew is skipping the required HEPA vacuuming step before applying antimicrobial solution to a surface. What should the CMRS do FIRST?
A.Document the deviation on the daily log and continue the project
B.Immediately stop the CMR's work, correct the deviation, and retrain the worker before allowing resumption
C.Report the CMR to ACAC for credential revocation
D.Allow the deviation if the supervisor believes the antimicrobial solution is sufficient alone
Explanation: A supervisor's primary quality control obligation is immediate intervention when a deviation from the approved work plan or S520 procedure is observed. Skipping HEPA vacuuming before applying antimicrobial is a protocol violation that could compromise clearance outcomes. The CMRS must stop the work, correct it, and document the correction in the daily project log.
7On a multi-day commercial remediation project, which items should be recorded in the DAILY project log? (Select the BEST answer.)
A.Only the number of workers on site and hours worked
B.Workers present, tasks completed, issues encountered, equipment readings, containment integrity checks, and any deviations from the work plan
C.Only weather conditions and supervisor signature
D.A summary of costs billed to the client for that day
Explanation: A complete daily project log is the supervisor's primary documentation tool and potential legal record. It should capture personnel on site, work performed, containment integrity verification, equipment performance data (negative air pressure readings, CFM), any deviations from the plan, corrective actions, and visitor log. This documentation supports quality control, billing disputes, and clearance review.
8Air monitoring records collected during a mold remediation project should include which of the following data points to be considered complete?
A.Only the final clearance sample results
B.Sample location, date/time, sampler ID, calibrated flow rate, sampling duration, total volume, and chain of custody
C.The laboratory name and the remediation contractor's license number only
D.Temperature and humidity at the start of each day
Explanation: Complete air monitoring records must document: where the sample was collected (room and height), when it was collected, who collected it (sampler credentials), equipment calibration data (flow rate), sampling duration, calculated air volume, and chain of custody to the laboratory. These data points are required for the laboratory to issue valid results and for the IEP to evaluate clearance.
9A subcontractor hired for containment construction fails to show up on the project start date. As CMRS, what is the BEST course of action?
A.Delay the entire project until the original subcontractor is available
B.Begin remediation in uncontained areas while waiting for the subcontractor
C.Contact backup suppliers immediately, notify the project manager and IEP of the delay, and revise the schedule to reflect the containment-first sequencing requirement
D.Have the CMR crew improvise containment using available materials without formal approval
Explanation: Containment must be established before remediation begins in Condition 2 or 3 areas; starting without it violates S520 and risks cross-contamination. The supervisor must resolve the subcontractor failure quickly through backup resources, communicate the delay to stakeholders (IEP and project manager), and ensure containment is properly installed before allowing any remediation work to proceed.
10Which of the following is the CORRECT sequence for establishing a critical containment barrier before large-scale Condition 3 mold remediation?
A.Begin demolition, then install poly sheeting, then start negative air machines
B.Install poly barriers and seal penetrations, verify negative pressure with smoke or differential pressure gauge, then begin remediation
C.Start negative air machines, begin demolition, then add poly barriers to catch debris
D.Install barriers without pressure testing if the containment looks visually sealed
Explanation: Per ANSI/IICRC S520, critical containment must be fully constructed and pressure-verified before any disturbance of contaminated material. The sequence is: build barriers → seal all penetrations → start negative air machines → verify and document negative pressure (ideally -5 to -10 Pa relative to adjacent areas) → begin remediation. Visual inspection alone is insufficient.

About the CMRS Exam

The Council-certified Microbial Remediation Supervisor (CMRS) is an ANSI-accredited certification from the American Council for Accredited Certification for the supervisory level of mold remediation. The CMRS plans projects, directs CMR-level workers, manages subcontractors, ensures OSHA compliance, and coordinates post-remediation verification with the IEP per ANSI/IICRC S520.

Questions

100 scored questions

Time Limit

2 hours

Passing Score

70%

Exam Fee

$395 (American Council for Accredited Certification (ACAC))

CMRS Exam Content Outline

20%

Scope Development and S520 Project Planning

Pre-remediation assessment, work plan development, S520 condition classification, and project sequencing.

20%

Crew Management and Quality Control

Directing CMR-level workers, training, work assignments, in-process inspections, and corrective actions.

15%

Project Documentation and Reporting

Daily logs, photo documentation, change orders, chain-of-custody, and final reports.

15%

Cost Estimating and Subcontractor Management

Scope-of-work pricing, subcontractor coordination, schedules, and Xactimate-style estimating.

20%

Worker Health and OSHA Compliance

OSHA 29 CFR 1910.134 respiratory protection, hazard communication, training, and exposure monitoring.

10%

Insurance, PRV Coordination, and Client Communication

Insurance documentation, IEP coordination, post-remediation verification, and client expectations.

How to Pass the CMRS Exam

What You Need to Know

  • Passing score: 70%
  • Exam length: 100 questions
  • Time limit: 2 hours
  • Exam fee: $395

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

Frequently Asked Questions

What is the ACAC CMRS certification?

The Council-certified Microbial Remediation Supervisor (CMRS) is an ANSI-accredited supervisory credential from the American Council for Accredited Certification (ACAC) that certifies competence in planning, directing, and documenting mold remediation projects per ANSI/IICRC S520.

How is the CMRS different from the CMR?

The CMR (Council-certified Microbial Remediator) certifies hands-on remediation workers, while the CMRS certifies the supervisor overseeing the project. CMRS holders manage CMR-level workers, develop work plans and budgets, ensure OSHA compliance, and coordinate clearance testing with the IEP.

How many questions are on the CMRS exam?

The CMRS exam has 100 multiple-choice questions delivered at computer-based testing centers or via remote-proctored online testing. Candidates must score 70% or higher to pass.

What does the CMRS certification cost?

The CMRS application and exam fee is approximately $395 through ACAC. Annual recertification fees apply once certified, and either continuing education or retesting is required every 5 years to maintain the credential.

What experience is required for the CMRS?

ACAC requires documented supervisory experience in mold remediation projects plus passing the exam. Many candidates first earn the CMR and accumulate field hours before sitting for the supervisory exam.