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Texas Landscape Irrigator License Actual
Exam 2026 – Questions & Answers with
Rationales | 100% Verified | TCEQ
Compliant | Graded A+
What can cause backsiphonage? ..........ANSWER.......A break in the city
mainline
Fire department using water from the city mainline to put out a fire
If the pressure in the sprinkler system exceeds the pressure in the supply
side, what phenomenon occurs? ..........ANSWER.......Backpressure
What is the unobstructed vertical distance through free atmosphere between
the lowest point of a water supply outlet and the flood level rim of the fixture
or assembly into which the outlet discharges? ..........ANSWER.......Air gap
The vertical, physical seperations, in an air gap, must be?
..........ANSWER.......Atleast twice the diameter of the water supply outlet but
never less than one inch
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Which backflow device has to be installed 6" above the highest head or
outlet? ..........ANSWER.......AVB
The maximum number of hours an AVB can be under constant pressure?
..........ANSWER.......12
How high does a pressure vacuum breaker have to be installed?
..........ANSWER.......12" above the highest head or outlet
Which backflow device incorporates one check valve?
..........ANSWER.......PVB
Which backflow device uses a pressure differential relief valve?
..........ANSWER.......RP
Which backflow device has to be installed 12" above grade?
..........ANSWER.......RP
Which of the following devices can be used if there is a health hazard?
..........ANSWER.......RP and PVB
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An electrical valve is also called? ..........ANSWER.......Automatic control
valve
Backsiphonage is a form of backflow that could be induced by?
..........ANSWER.......A break in the city main
Poly vinyl chloride represents what type of irrigation piping?
..........ANSWER.......PVC
To help manage the proper scheduling of water to the landscape, you need
to install? ..........ANSWER.......Rain, freeze, soil moisture, and wind sensors
Which indicates matched precipitation rates? ..........ANSWER.......Quarter
heads- 1GPM
Half heads- 2GPM
Three quarter heads- 3GPM
Full heads- 4GPM
Increased pressure as the head will result in? ..........ANSWER.......Increased
GPM and throw
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Excessive pressure at the head will result in? ..........ANSWER.......Misting,
fogging, wasted water, pattern absorption, decreased performance
What type of sprinkler head throws a uniform sheet of water in a fixed or
adjustable pattern? ..........ANSWER.......Spray heads
The average application rate for spray heads is? ..........ANSWER.......1-3" per
hour
Spray heads throw? ..........ANSWER.......4-20'
Spray heads should not be defused more than? ..........ANSWER.......25%
How are shrub spray mounted? ..........ANSWER.......On various types of
risers
Which sprinkler heads work best for large turf areas?
..........ANSWER.......Rotary heads
How far to rotary heads throw? ..........ANSWER.......20-40'
Texas Landscape Irrigator License Actual
Exam 2026 – Questions & Answers with
Rationales | 100% Verified | TCEQ
Compliant | Graded A+
What can cause backsiphonage? ..........ANSWER.......A break in the city
mainline
Fire department using water from the city mainline to put out a fire
If the pressure in the sprinkler system exceeds the pressure in the supply
side, what phenomenon occurs? ..........ANSWER.......Backpressure
What is the unobstructed vertical distance through free atmosphere between
the lowest point of a water supply outlet and the flood level rim of the fixture
or assembly into which the outlet discharges? ..........ANSWER.......Air gap
The vertical, physical seperations, in an air gap, must be?
..........ANSWER.......Atleast twice the diameter of the water supply outlet but
never less than one inch
,2|Page
Which backflow device has to be installed 6" above the highest head or
outlet? ..........ANSWER.......AVB
The maximum number of hours an AVB can be under constant pressure?
..........ANSWER.......12
How high does a pressure vacuum breaker have to be installed?
..........ANSWER.......12" above the highest head or outlet
Which backflow device incorporates one check valve?
..........ANSWER.......PVB
Which backflow device uses a pressure differential relief valve?
..........ANSWER.......RP
Which backflow device has to be installed 12" above grade?
..........ANSWER.......RP
Which of the following devices can be used if there is a health hazard?
..........ANSWER.......RP and PVB
,3|Page
An electrical valve is also called? ..........ANSWER.......Automatic control
valve
Backsiphonage is a form of backflow that could be induced by?
..........ANSWER.......A break in the city main
Poly vinyl chloride represents what type of irrigation piping?
..........ANSWER.......PVC
To help manage the proper scheduling of water to the landscape, you need
to install? ..........ANSWER.......Rain, freeze, soil moisture, and wind sensors
Which indicates matched precipitation rates? ..........ANSWER.......Quarter
heads- 1GPM
Half heads- 2GPM
Three quarter heads- 3GPM
Full heads- 4GPM
Increased pressure as the head will result in? ..........ANSWER.......Increased
GPM and throw
, 4|Page
Excessive pressure at the head will result in? ..........ANSWER.......Misting,
fogging, wasted water, pattern absorption, decreased performance
What type of sprinkler head throws a uniform sheet of water in a fixed or
adjustable pattern? ..........ANSWER.......Spray heads
The average application rate for spray heads is? ..........ANSWER.......1-3" per
hour
Spray heads throw? ..........ANSWER.......4-20'
Spray heads should not be defused more than? ..........ANSWER.......25%
How are shrub spray mounted? ..........ANSWER.......On various types of
risers
Which sprinkler heads work best for large turf areas?
..........ANSWER.......Rotary heads
How far to rotary heads throw? ..........ANSWER.......20-40'
