Arizona Backflow Prevention Assembly
Tester Certification Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. What is the primary purpose of backflow prevention assemblies?
A. To increase water pressure
B. To filter sediment from water
C. To protect the potable water supply from contamination
D. To reduce water usage
The primary purpose of backflow prevention assemblies is to protect
the potable water system from contaminants entering due to
backflow.
2. Which condition can cause backflow in a potable water system?
A. Normal high pressure
B. Backpressure or backsiphonage
C. Chlorination
D. Aeration
Backflow occurs when backpressure or backsiphonage forces water
in the reverse direction into the potable supply.
,3. Backsiphonage is most likely to occur when:
A. There is increased downstream pressure
B. Water treatment is improved
C. There is a significant drop in supply pressure
D. Valves are fully closed
Backsiphonage happens when supply pressure drops below
downstream pressure, creating suction.
4. What does a Reduced Pressure Zone (RPZ) Assembly protect against?
A. Only backpressure
B. Only dirt particles
C. Both backpressure and backsiphonage
D. Evaporation
An RPZ Assembly is designed to protect against both backpressure
and backsiphonage.
5. A Double Check Valve Assembly (DCVA) is suitable for what hazard
level?
A. High health hazard
B. Low to medium hazard
C. No hazard
D. Extreme hazard
DCVAs are used where hazards pose low to medium risk to potable
water.
6. What must be done before testing a backflow assembly?
A. Increase system pressure
B. Replace all parts
C. Shut off water and isolate the assembly
D. Open all downstream faucets
Before testing, the assembly must be isolated and the water supply
shut off for safety and accurate results.
, 7. How often should most backflow prevention assemblies be tested?
A. Every five years
B. Monthly
C. Weekly
D. Annually
Annual testing is the standard requirement for most backflow
prevention assemblies.
8. Which device uses two independent check valves with a relief valve in
between?
A. Ball valve
B. Air gap
C. Reduced Pressure Zone Assembly
D. Pressure vacuum breaker
An RPZ assembly has two check valves and a relief valve between
them.
9. What instrument is commonly used by testers to measure pressure
differences across check valves?
A. Thermometer
B. Flow meter
C. Differential pressure gauge
D. Ohmmeter
Differential pressure gauges measure pressures across valves to
determine proper operation.
10. In Arizona, who must perform backflow assembly testing?
A. Any plumber
B. Homeowner
C. Certified Backflow Prevention Assembly Tester
D. Municipal mayor
Tester Certification Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. What is the primary purpose of backflow prevention assemblies?
A. To increase water pressure
B. To filter sediment from water
C. To protect the potable water supply from contamination
D. To reduce water usage
The primary purpose of backflow prevention assemblies is to protect
the potable water system from contaminants entering due to
backflow.
2. Which condition can cause backflow in a potable water system?
A. Normal high pressure
B. Backpressure or backsiphonage
C. Chlorination
D. Aeration
Backflow occurs when backpressure or backsiphonage forces water
in the reverse direction into the potable supply.
,3. Backsiphonage is most likely to occur when:
A. There is increased downstream pressure
B. Water treatment is improved
C. There is a significant drop in supply pressure
D. Valves are fully closed
Backsiphonage happens when supply pressure drops below
downstream pressure, creating suction.
4. What does a Reduced Pressure Zone (RPZ) Assembly protect against?
A. Only backpressure
B. Only dirt particles
C. Both backpressure and backsiphonage
D. Evaporation
An RPZ Assembly is designed to protect against both backpressure
and backsiphonage.
5. A Double Check Valve Assembly (DCVA) is suitable for what hazard
level?
A. High health hazard
B. Low to medium hazard
C. No hazard
D. Extreme hazard
DCVAs are used where hazards pose low to medium risk to potable
water.
6. What must be done before testing a backflow assembly?
A. Increase system pressure
B. Replace all parts
C. Shut off water and isolate the assembly
D. Open all downstream faucets
Before testing, the assembly must be isolated and the water supply
shut off for safety and accurate results.
, 7. How often should most backflow prevention assemblies be tested?
A. Every five years
B. Monthly
C. Weekly
D. Annually
Annual testing is the standard requirement for most backflow
prevention assemblies.
8. Which device uses two independent check valves with a relief valve in
between?
A. Ball valve
B. Air gap
C. Reduced Pressure Zone Assembly
D. Pressure vacuum breaker
An RPZ assembly has two check valves and a relief valve between
them.
9. What instrument is commonly used by testers to measure pressure
differences across check valves?
A. Thermometer
B. Flow meter
C. Differential pressure gauge
D. Ohmmeter
Differential pressure gauges measure pressures across valves to
determine proper operation.
10. In Arizona, who must perform backflow assembly testing?
A. Any plumber
B. Homeowner
C. Certified Backflow Prevention Assembly Tester
D. Municipal mayor
