IICRC MRS Practice Exam
Mold Remediation Specialist – 120 Practice Questions with Answers &
Rationales
1. Which organization publishes the ANSI/IICRC S520 Standard for Professional
Mold Remediation?
A. The Environmental Protection Agency (EPA)
B. The Institute of Inspection, Cleaning and Restoration Certification (IICRC)
C. The Occupational Safety and Health Administration (OSHA)
D. The American Industrial Hygiene Association (AIHA)
Correct Answer: B. The Institute of Inspection, Cleaning and Restoration
Certification (IICRC)
Rationale: The S520 Standard is developed and published by the IICRC, a non-profit
standard-setting and certification body for the cleaning and restoration industry.
2. Mold requires which combination of conditions to grow and proliferate on a
building material?
A. Sunlight, oxygen, and low humidity
B. A food source, moisture, and a suitable temperature range
C. Darkness, low temperature, and high air movement
D. Negative air pressure and HEPA filtration
Correct Answer: B. A food source, moisture, and a suitable temperature range
Rationale: Mold growth requires an organic food source (most building materials
qualify), available moisture, and temperatures generally between 40-100 F; light and
pressure are not limiting factors for growth.
,3. According to S520, which term describes a normal fungal ecology consistent
with what would be expected in a similar unaffected space?
A. Condition 1 (Normal Fungal Ecology)
B. Condition 2 (Settled Spores)
C. Condition 3 (Actual Growth)
D. Condition 4 (Cross-Contamination)
Correct Answer: A. Condition 1 (Normal Fungal Ecology)
Rationale: S520 defines Condition 1 as an indoor environment that may have settled
spores, fungal fragments, or traces of actual growth whose identity and quantity are
consistent with a normal fungal ecology for a similar, unaffected space.
4. An indoor environment contaminated with settled spores dispersed from a
Condition 3 area, without actual growth having occurred, is classified as which
condition?
A. Condition 1
B. Condition 2
C. Condition 3
D. Condition 4
Correct Answer: B. Condition 2
Rationale: Condition 2 describes an indoor environment primarily contaminated with
settled spores that were dispersed directly or indirectly from a Condition 3 area, but
where actual growth has not occurred on surfaces in that space.
5. Actual mold growth occurring on an interior building material, system, or
content is classified under S520 as which condition?
A. Condition 1
B. Condition 2
C. Condition 3
D. Condition 4 (there is no Condition 4)
Correct Answer: C. Condition 3
Rationale: Condition 3 is defined in S520 as an indoor environment contaminated by
the presence of actual mold growth, which may include colonized materials, and
requires remediation.
,6. What is the primary purpose of a pre-remediation assessment before
beginning mold remediation work?
A. To determine the paint color of the affected walls
B. To identify the scope, extent, and cause of the contamination and moisture
source
C. To select a demolition contractor
D. To calculate the client's insurance deductible
Correct Answer: B. To identify the scope, extent, and cause of the
contamination and moisture source
Rationale: A pre-remediation assessment identifies the type and extent of
contamination, the underlying moisture source, and the work area boundaries, which
drives the remediation plan; without correcting the moisture source, remediation will
fail.
7. Which statement best reflects the relationship between moisture control and
mold remediation?
A. Mold remediation can be considered complete even if the moisture source is
still active
B. Successful remediation must include identification and correction of the
moisture source
C. Moisture control is only relevant for Category 3 water losses
D. Antimicrobial application eliminates the need to address moisture
Correct Answer: B. Successful remediation must include identification and
correction of the moisture source
Rationale: S520 emphasizes that remediation is not complete, and will likely fail,
unless the underlying moisture intrusion or elevated humidity condition causing the
growth is identified and corrected.
, 8. A remediator arrives at a job site and finds visible mold growth covering
approximately 40 square feet of drywall in a basement. Per general S520
guidance, this scope of contamination is generally considered which of the
following?
A. A small, Level 1 project manageable without containment
B. A large-scale/Condition 3 project typically warranting an engineering controls
and containment strategy
C. Outside the scope of mold remediation entirely
D. Automatically requiring a full building evacuation
Correct Answer: B. A large-scale/Condition 3 project typically warranting an
engineering controls and containment strategy
Rationale: Larger areas of contamination (historically referenced around 10 sq ft or
more in prior guidance documents, and addressed in S520 through a risk-based
approach) generally require more rigorous engineering controls, such as containment
and negative air, than very small isolated areas.
9. What does the term 'engineering controls' refer to in the context of mold
remediation?
A. Administrative paperwork used to document the job
B. Physical means used to control the migration of contaminants and protect
workers and occupants, such as containment and air filtration devices
C. The structural engineering calculations for a rebuild
D. The scheduling software used to coordinate technicians
Correct Answer: B. Physical means used to control the migration of
contaminants and protect workers and occupants, such as containment and air
filtration devices
Rationale: Engineering controls are physical or mechanical methods, such as
containment barriers, negative air machines, and HEPA filtration, used to limit
contaminant migration and exposure during remediation.
Mold Remediation Specialist – 120 Practice Questions with Answers &
Rationales
1. Which organization publishes the ANSI/IICRC S520 Standard for Professional
Mold Remediation?
A. The Environmental Protection Agency (EPA)
B. The Institute of Inspection, Cleaning and Restoration Certification (IICRC)
C. The Occupational Safety and Health Administration (OSHA)
D. The American Industrial Hygiene Association (AIHA)
Correct Answer: B. The Institute of Inspection, Cleaning and Restoration
Certification (IICRC)
Rationale: The S520 Standard is developed and published by the IICRC, a non-profit
standard-setting and certification body for the cleaning and restoration industry.
2. Mold requires which combination of conditions to grow and proliferate on a
building material?
A. Sunlight, oxygen, and low humidity
B. A food source, moisture, and a suitable temperature range
C. Darkness, low temperature, and high air movement
D. Negative air pressure and HEPA filtration
Correct Answer: B. A food source, moisture, and a suitable temperature range
Rationale: Mold growth requires an organic food source (most building materials
qualify), available moisture, and temperatures generally between 40-100 F; light and
pressure are not limiting factors for growth.
,3. According to S520, which term describes a normal fungal ecology consistent
with what would be expected in a similar unaffected space?
A. Condition 1 (Normal Fungal Ecology)
B. Condition 2 (Settled Spores)
C. Condition 3 (Actual Growth)
D. Condition 4 (Cross-Contamination)
Correct Answer: A. Condition 1 (Normal Fungal Ecology)
Rationale: S520 defines Condition 1 as an indoor environment that may have settled
spores, fungal fragments, or traces of actual growth whose identity and quantity are
consistent with a normal fungal ecology for a similar, unaffected space.
4. An indoor environment contaminated with settled spores dispersed from a
Condition 3 area, without actual growth having occurred, is classified as which
condition?
A. Condition 1
B. Condition 2
C. Condition 3
D. Condition 4
Correct Answer: B. Condition 2
Rationale: Condition 2 describes an indoor environment primarily contaminated with
settled spores that were dispersed directly or indirectly from a Condition 3 area, but
where actual growth has not occurred on surfaces in that space.
5. Actual mold growth occurring on an interior building material, system, or
content is classified under S520 as which condition?
A. Condition 1
B. Condition 2
C. Condition 3
D. Condition 4 (there is no Condition 4)
Correct Answer: C. Condition 3
Rationale: Condition 3 is defined in S520 as an indoor environment contaminated by
the presence of actual mold growth, which may include colonized materials, and
requires remediation.
,6. What is the primary purpose of a pre-remediation assessment before
beginning mold remediation work?
A. To determine the paint color of the affected walls
B. To identify the scope, extent, and cause of the contamination and moisture
source
C. To select a demolition contractor
D. To calculate the client's insurance deductible
Correct Answer: B. To identify the scope, extent, and cause of the
contamination and moisture source
Rationale: A pre-remediation assessment identifies the type and extent of
contamination, the underlying moisture source, and the work area boundaries, which
drives the remediation plan; without correcting the moisture source, remediation will
fail.
7. Which statement best reflects the relationship between moisture control and
mold remediation?
A. Mold remediation can be considered complete even if the moisture source is
still active
B. Successful remediation must include identification and correction of the
moisture source
C. Moisture control is only relevant for Category 3 water losses
D. Antimicrobial application eliminates the need to address moisture
Correct Answer: B. Successful remediation must include identification and
correction of the moisture source
Rationale: S520 emphasizes that remediation is not complete, and will likely fail,
unless the underlying moisture intrusion or elevated humidity condition causing the
growth is identified and corrected.
, 8. A remediator arrives at a job site and finds visible mold growth covering
approximately 40 square feet of drywall in a basement. Per general S520
guidance, this scope of contamination is generally considered which of the
following?
A. A small, Level 1 project manageable without containment
B. A large-scale/Condition 3 project typically warranting an engineering controls
and containment strategy
C. Outside the scope of mold remediation entirely
D. Automatically requiring a full building evacuation
Correct Answer: B. A large-scale/Condition 3 project typically warranting an
engineering controls and containment strategy
Rationale: Larger areas of contamination (historically referenced around 10 sq ft or
more in prior guidance documents, and addressed in S520 through a risk-based
approach) generally require more rigorous engineering controls, such as containment
and negative air, than very small isolated areas.
9. What does the term 'engineering controls' refer to in the context of mold
remediation?
A. Administrative paperwork used to document the job
B. Physical means used to control the migration of contaminants and protect
workers and occupants, such as containment and air filtration devices
C. The structural engineering calculations for a rebuild
D. The scheduling software used to coordinate technicians
Correct Answer: B. Physical means used to control the migration of
contaminants and protect workers and occupants, such as containment and air
filtration devices
Rationale: Engineering controls are physical or mechanical methods, such as
containment barriers, negative air machines, and HEPA filtration, used to limit
contaminant migration and exposure during remediation.
