IICRC WRT (WATER RESTORATION
TECHNICIAN) CERTIFICATION EXAM
2026/2027 QUESTIONS AND ANSWERS
1. According to the IICRC S500, which Category of water contains significant contamination
and has the potential to cause substantial inappropriate health effects if consumed or
inhaled?
A. Category 1
B. Category 4
C. Category 3
D. Category 2
Answer: D
Conceptual Explanation: Category 2 water contains significant contamination (e.g.,
dishwasher discharge, sump pump failures). Category 3 is grossly contaminated (sewage).
2. A water intrusion where water has saturated an entire room of carpet and pad, and has
wicked up the walls more than 24 inches, is classified as which Class of water?
A. Class 3
,B. Class 2
C. Class 1
D. Class 4
Answer: A
Conceptual Explanation: Class 3 involves the greatest amount of water, absorption, and
evaporation surface area (ceilings, walls, insulation, carpet) with wicking over 24 inches.
3. What is the definition of Grains Per Pound (GPP)?
A. The weight of water vapor in a gallon of air
B. The weight of water vapor in a pound of dry air
C. The percentage of moisture saturation in the air
D. The temperature at which condensation occurs
Answer: B
Conceptual Explanation: GPP is the unit of measure for specific humidity (humidity ratio),
representing the weight of water vapor per pound of dry air.
4. At what temperature does air reach 100% relative humidity and begin to condense water
onto surfaces?
A. Evaporation point
B. Dew point
, C. Saturation point
D. Dry bulb temperature
Answer: B
Conceptual Explanation: Dew point is the temperature at which air becomes saturated
and water vapor condenses into liquid.
5. Which type of dehumidifier is most effective in environments with low specific humidity
(below 30-40 GPP)?
A. Conventional Refrigerant
B. LGR (Low Grain Refrigerant)
C. Desiccant
D. Thermo-electric
Answer: C
Conceptual Explanation: Desiccant dehumidifiers use chemical attraction to pull moisture
from the air and can achieve much lower GPP levels than refrigerant models.
6. When using a moisture meter to determine the ‘dry standard,’ where should the technician
take the reading?
A. From the wettest part of the affected material
B. From an unaffected similar material in the same environment
C. From a piece of new material in the truck
TECHNICIAN) CERTIFICATION EXAM
2026/2027 QUESTIONS AND ANSWERS
1. According to the IICRC S500, which Category of water contains significant contamination
and has the potential to cause substantial inappropriate health effects if consumed or
inhaled?
A. Category 1
B. Category 4
C. Category 3
D. Category 2
Answer: D
Conceptual Explanation: Category 2 water contains significant contamination (e.g.,
dishwasher discharge, sump pump failures). Category 3 is grossly contaminated (sewage).
2. A water intrusion where water has saturated an entire room of carpet and pad, and has
wicked up the walls more than 24 inches, is classified as which Class of water?
A. Class 3
,B. Class 2
C. Class 1
D. Class 4
Answer: A
Conceptual Explanation: Class 3 involves the greatest amount of water, absorption, and
evaporation surface area (ceilings, walls, insulation, carpet) with wicking over 24 inches.
3. What is the definition of Grains Per Pound (GPP)?
A. The weight of water vapor in a gallon of air
B. The weight of water vapor in a pound of dry air
C. The percentage of moisture saturation in the air
D. The temperature at which condensation occurs
Answer: B
Conceptual Explanation: GPP is the unit of measure for specific humidity (humidity ratio),
representing the weight of water vapor per pound of dry air.
4. At what temperature does air reach 100% relative humidity and begin to condense water
onto surfaces?
A. Evaporation point
B. Dew point
, C. Saturation point
D. Dry bulb temperature
Answer: B
Conceptual Explanation: Dew point is the temperature at which air becomes saturated
and water vapor condenses into liquid.
5. Which type of dehumidifier is most effective in environments with low specific humidity
(below 30-40 GPP)?
A. Conventional Refrigerant
B. LGR (Low Grain Refrigerant)
C. Desiccant
D. Thermo-electric
Answer: C
Conceptual Explanation: Desiccant dehumidifiers use chemical attraction to pull moisture
from the air and can achieve much lower GPP levels than refrigerant models.
6. When using a moisture meter to determine the ‘dry standard,’ where should the technician
take the reading?
A. From the wettest part of the affected material
B. From an unaffected similar material in the same environment
C. From a piece of new material in the truck
