Texas Landscape Irrigator Exam Test Questions
And Correct Answers (Verified Answers) Plus
Rationales 2025/2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of an irrigation system?
o Answer: b) To supplement natural rainfall for landscape plants
o Rationale: The main goal of irrigation is to provide adequate water
to landscapes when rainfall is insufficient.
2. Which device prevents backflow into the potable water system?
o Answer: c) Reduced pressure zone (RPZ) assembly
o Rationale: RPZ assemblies are approved for backflow prevention in
high-hazard irrigation systems.
3. What is the minimum passing score for each section of the Texas Irrigator
Exam?
o Answer: b) 70%
o Rationale: A score of 70% or higher is required to pass each section
of the exam.
4. How often must a licensed irrigator renew their license?
, o Answer: c) Every three years
o Rationale: Texas requires irrigators to renew their license every
three years.
5. What is the required scale for an irrigation plan for residential installations?
o Answer: b) 1” = 30’
o Rationale: Residential irrigation plans should use a scale of 1” equal
to 30 feet.
6. Which of the following is exempt from irrigation rules?
o Answer: a) On-site Sewage Facilities
o Rationale: On-site sewage facilities are exempt from certain
irrigation rules.
7. What is the function of a rain or moisture shut-off device?
o Answer: b) To stop irrigation during rainfall
o Rationale: These devices prevent irrigation during rainfall,
conserving water.
8. Who is responsible for obtaining permits and inspections for an irrigation
system?
o Answer: a) Licensed Irrigator
o Rationale: The licensed irrigator is responsible for securing
necessary permits and inspections.
9. What does ET stand for in irrigation design?
o Answer: a) Evapotranspiration
, o Rationale: ET represents the combined water loss from soil
evaporation and plant transpiration.
10.What is the purpose of a pressure vacuum breaker (PVB)?
o Answer: b) To prevent backflow into the potable water system
o Rationale: PVBs are used to prevent backflow, ensuring potable
water safety.
11.Which pipe material is commonly used for irrigation systems?
o Answer: c) PVC
o Rationale: PVC pipes are widely used due to their durability and
cost-effectiveness.
12.What is the standard operating pressure for most sprinkler heads?
o Answer: b) 30-50 psi
o Rationale: Most sprinkler heads operate efficiently within this
pressure range.
13.What is the primary factor in determining irrigation scheduling?
o Answer: a) Evapotranspiration rates
o Rationale: ET rates help determine how much water plants need.
14.Which valve is used to control water flow in an irrigation system?
o Answer: c) Gate valve
o Rationale: Gate valves are commonly used to control water flow.
15.What is the purpose of an isolation valve in an irrigation system?
And Correct Answers (Verified Answers) Plus
Rationales 2025/2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of an irrigation system?
o Answer: b) To supplement natural rainfall for landscape plants
o Rationale: The main goal of irrigation is to provide adequate water
to landscapes when rainfall is insufficient.
2. Which device prevents backflow into the potable water system?
o Answer: c) Reduced pressure zone (RPZ) assembly
o Rationale: RPZ assemblies are approved for backflow prevention in
high-hazard irrigation systems.
3. What is the minimum passing score for each section of the Texas Irrigator
Exam?
o Answer: b) 70%
o Rationale: A score of 70% or higher is required to pass each section
of the exam.
4. How often must a licensed irrigator renew their license?
, o Answer: c) Every three years
o Rationale: Texas requires irrigators to renew their license every
three years.
5. What is the required scale for an irrigation plan for residential installations?
o Answer: b) 1” = 30’
o Rationale: Residential irrigation plans should use a scale of 1” equal
to 30 feet.
6. Which of the following is exempt from irrigation rules?
o Answer: a) On-site Sewage Facilities
o Rationale: On-site sewage facilities are exempt from certain
irrigation rules.
7. What is the function of a rain or moisture shut-off device?
o Answer: b) To stop irrigation during rainfall
o Rationale: These devices prevent irrigation during rainfall,
conserving water.
8. Who is responsible for obtaining permits and inspections for an irrigation
system?
o Answer: a) Licensed Irrigator
o Rationale: The licensed irrigator is responsible for securing
necessary permits and inspections.
9. What does ET stand for in irrigation design?
o Answer: a) Evapotranspiration
, o Rationale: ET represents the combined water loss from soil
evaporation and plant transpiration.
10.What is the purpose of a pressure vacuum breaker (PVB)?
o Answer: b) To prevent backflow into the potable water system
o Rationale: PVBs are used to prevent backflow, ensuring potable
water safety.
11.Which pipe material is commonly used for irrigation systems?
o Answer: c) PVC
o Rationale: PVC pipes are widely used due to their durability and
cost-effectiveness.
12.What is the standard operating pressure for most sprinkler heads?
o Answer: b) 30-50 psi
o Rationale: Most sprinkler heads operate efficiently within this
pressure range.
13.What is the primary factor in determining irrigation scheduling?
o Answer: a) Evapotranspiration rates
o Rationale: ET rates help determine how much water plants need.
14.Which valve is used to control water flow in an irrigation system?
o Answer: c) Gate valve
o Rationale: Gate valves are commonly used to control water flow.
15.What is the purpose of an isolation valve in an irrigation system?
