IICRC WRT — Water Restoration Technician Exam Prep |
IICRC WRT: WATER DAMAGE RESTORATION TECHNICIAN EXAM QUESTIONS AND
ANSWERS - 100% VERIFIED - LATEST 2026 - GUARANTEED PASS
# QUESTION ANSWER
1 What are the three categories Category 1 (Clean Water),
of water used in the IICRC Category 2 (Gray Water), and
S500 standard? Category 3 (Black Water).
2 What defines Category 1 Water that originates from a
water? sanitary source and poses no
substantial risk from dermal,
ingestion, or inhalation exposure.
Examples: broken supply lines,
sink overflows without
contaminants.
3 What defines Category 2 water Water containing significant
(Gray Water)? contamination and having
potential to cause discomfort or
sickness if consumed or exposed
to. Examples: toilet bowl overflow
(urine, no feces), dishwasher
discharge, washing machine
overflow.
4 What defines Category 3 water Grossly contaminated water
(Black Water)? containing pathogenic agents.
Examples: sewage backups,
flooding from seawater, rivers,
streams, or standing water that
has begun to support microbial
growth.
For Study Purposes Only — Page 1 of 49
,IICRC WRT — Water Restoration Technician Exam Prep |
# QUESTION ANSWER
5 Can a water damage category Yes. Category 1 water can
change over time? become Category 2 or Category
3 if left untreated for an extended
period due to microbial growth
and contamination.
6 What is the primary health Exposure to pathogenic agents
concern with Category 3 water? including bacteria, viruses, and
fungi that can cause serious
illness or death.
7 Give an example of a Category A broken supply line, overflowing
1 water source. sink without contaminants,
rainwater, or melting snow/ice.
8 Give three examples of Toilet bowl overflow with urine
Category 2 water sources. (no feces), dishwasher or
washing machine discharge,
sump pump failures, and
aquarium leaks.
9 Give three examples of Sewage backups, toilet overflow
Category 3 water sources. with feces, flooding from
rivers/streams/seawater, and
standing water that has begun
microbial growth.
10 What is the significance of Water category determines the
water category in restoration level of PPE required, whether
planning? materials can be dried in place or
must be removed, and the scope
of remediation needed.
11 What are the four classes of Class 1, Class 2, Class 3, and
water damage defined by Class 4.
IICRC?
12 What defines a Class 1 water The least amount of water,
loss? absorption, and evaporative load.
Water has affected only part of a
room or area; little or no wet
carpet. Moisture has penetrated
For Study Purposes Only — Page 2 of 49
,IICRC WRT — Water Restoration Technician Exam Prep |
# QUESTION ANSWER
only shallow materials (e.g.,
plywood, structural wood).
13 What defines a Class 2 water Large amount of water affecting
loss? an entire room of carpet and
cushion. Water has wicked up
walls less than 24 inches.
Moisture remains in structural
materials.
14 What defines a Class 3 water Greatest amount of water,
loss? absorption, and evaporative load.
Water may have come from
overhead. Ceilings, walls,
insulation, carpet, and sub-floor
are saturated.
15 What defines a Class 4 water Specialty drying situations
loss? requiring very low specific
humidity and a long drying time.
Wet materials with very low
permeance (hardwood floors,
plaster, brick, concrete, crawl
spaces, gypcrete).
16 Why is water class important in Water class determines the type
restoration? and amount of drying equipment
needed, the drying strategy, and
the expected drying time.
17 Which water class typically Class 3, because it involves the
requires the most drying greatest volume of water
equipment? absorption and the highest
evaporative load.
18 What type of materials are Dense, low-permeance materials
typically involved in a Class 4 like hardwood floors, concrete,
water loss? brick, crawl spaces, and plaster
that require specialty drying
techniques.
For Study Purposes Only — Page 3 of 49
, IICRC WRT — Water Restoration Technician Exam Prep |
# QUESTION ANSWER
19 What does 'evaporative load' The amount of moisture that must
mean in the context of water be evaporated from materials
damage classes? during the drying process; higher
classes mean more evaporative
load.
20 How does wall wicking height If water has wicked up walls less
help determine water class? than 24 inches, it's typically Class
2; if the entire wall height is wet
or ceilings are affected, it
indicates Class 3.
21 What is psychrometrics? The study of the thermodynamic
properties of moist air and the
use of these properties to analyze
conditions and processes
involving moist air.
22 Define relative humidity (RH). The ratio of the amount of
moisture in the air compared to
the maximum amount of moisture
that air can hold at the same
temperature, expressed as a
percentage.
23 What is the dew point? The temperature at which air
must be cooled for water vapor to
condense into liquid water; it
indicates the moisture content of
the air.
24 What is specific humidity? The weight of water vapor per
pound of dry air, typically
expressed in grains per pound
(GPP) or grams per kilogram.
25 What is a grain (unit of A unit used to measure moisture
measurement)? content in air; 7,000 grains equals
one pound of water.
26 What is a psychrometer? An instrument used to measure
relative humidity by comparing
For Study Purposes Only — Page 4 of 49
IICRC WRT: WATER DAMAGE RESTORATION TECHNICIAN EXAM QUESTIONS AND
ANSWERS - 100% VERIFIED - LATEST 2026 - GUARANTEED PASS
# QUESTION ANSWER
1 What are the three categories Category 1 (Clean Water),
of water used in the IICRC Category 2 (Gray Water), and
S500 standard? Category 3 (Black Water).
2 What defines Category 1 Water that originates from a
water? sanitary source and poses no
substantial risk from dermal,
ingestion, or inhalation exposure.
Examples: broken supply lines,
sink overflows without
contaminants.
3 What defines Category 2 water Water containing significant
(Gray Water)? contamination and having
potential to cause discomfort or
sickness if consumed or exposed
to. Examples: toilet bowl overflow
(urine, no feces), dishwasher
discharge, washing machine
overflow.
4 What defines Category 3 water Grossly contaminated water
(Black Water)? containing pathogenic agents.
Examples: sewage backups,
flooding from seawater, rivers,
streams, or standing water that
has begun to support microbial
growth.
For Study Purposes Only — Page 1 of 49
,IICRC WRT — Water Restoration Technician Exam Prep |
# QUESTION ANSWER
5 Can a water damage category Yes. Category 1 water can
change over time? become Category 2 or Category
3 if left untreated for an extended
period due to microbial growth
and contamination.
6 What is the primary health Exposure to pathogenic agents
concern with Category 3 water? including bacteria, viruses, and
fungi that can cause serious
illness or death.
7 Give an example of a Category A broken supply line, overflowing
1 water source. sink without contaminants,
rainwater, or melting snow/ice.
8 Give three examples of Toilet bowl overflow with urine
Category 2 water sources. (no feces), dishwasher or
washing machine discharge,
sump pump failures, and
aquarium leaks.
9 Give three examples of Sewage backups, toilet overflow
Category 3 water sources. with feces, flooding from
rivers/streams/seawater, and
standing water that has begun
microbial growth.
10 What is the significance of Water category determines the
water category in restoration level of PPE required, whether
planning? materials can be dried in place or
must be removed, and the scope
of remediation needed.
11 What are the four classes of Class 1, Class 2, Class 3, and
water damage defined by Class 4.
IICRC?
12 What defines a Class 1 water The least amount of water,
loss? absorption, and evaporative load.
Water has affected only part of a
room or area; little or no wet
carpet. Moisture has penetrated
For Study Purposes Only — Page 2 of 49
,IICRC WRT — Water Restoration Technician Exam Prep |
# QUESTION ANSWER
only shallow materials (e.g.,
plywood, structural wood).
13 What defines a Class 2 water Large amount of water affecting
loss? an entire room of carpet and
cushion. Water has wicked up
walls less than 24 inches.
Moisture remains in structural
materials.
14 What defines a Class 3 water Greatest amount of water,
loss? absorption, and evaporative load.
Water may have come from
overhead. Ceilings, walls,
insulation, carpet, and sub-floor
are saturated.
15 What defines a Class 4 water Specialty drying situations
loss? requiring very low specific
humidity and a long drying time.
Wet materials with very low
permeance (hardwood floors,
plaster, brick, concrete, crawl
spaces, gypcrete).
16 Why is water class important in Water class determines the type
restoration? and amount of drying equipment
needed, the drying strategy, and
the expected drying time.
17 Which water class typically Class 3, because it involves the
requires the most drying greatest volume of water
equipment? absorption and the highest
evaporative load.
18 What type of materials are Dense, low-permeance materials
typically involved in a Class 4 like hardwood floors, concrete,
water loss? brick, crawl spaces, and plaster
that require specialty drying
techniques.
For Study Purposes Only — Page 3 of 49
, IICRC WRT — Water Restoration Technician Exam Prep |
# QUESTION ANSWER
19 What does 'evaporative load' The amount of moisture that must
mean in the context of water be evaporated from materials
damage classes? during the drying process; higher
classes mean more evaporative
load.
20 How does wall wicking height If water has wicked up walls less
help determine water class? than 24 inches, it's typically Class
2; if the entire wall height is wet
or ceilings are affected, it
indicates Class 3.
21 What is psychrometrics? The study of the thermodynamic
properties of moist air and the
use of these properties to analyze
conditions and processes
involving moist air.
22 Define relative humidity (RH). The ratio of the amount of
moisture in the air compared to
the maximum amount of moisture
that air can hold at the same
temperature, expressed as a
percentage.
23 What is the dew point? The temperature at which air
must be cooled for water vapor to
condense into liquid water; it
indicates the moisture content of
the air.
24 What is specific humidity? The weight of water vapor per
pound of dry air, typically
expressed in grains per pound
(GPP) or grams per kilogram.
25 What is a grain (unit of A unit used to measure moisture
measurement)? content in air; 7,000 grains equals
one pound of water.
26 What is a psychrometer? An instrument used to measure
relative humidity by comparing
For Study Purposes Only — Page 4 of 49
