COLORADO BACKFLOW PREVENTION ASSEMBLY
TESTER CERTIFICATION EXAM QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS) Q&A
2026 |INSTANT DOWNLOAD PDF
1. What is the primary purpose of a backflow prevention
assembly?
A. Increase water pressure
B. Prevent contamination of potable water
C. Filter sediment from water
D. Measure water flow
Rationale: Backflow prevention assemblies are designed to
stop reverse flow that could introduce contaminants into clean
water supplies.
Correct Answer: B. Prevent contamination of potable water
2. Backflow is defined as:
A. Forward flow of water
B. Reverse flow of water into potable system
C. Increased pressure in pipes
D. Water leakage from fixtures
,Rationale: Backflow occurs when water flows in the opposite
direction from intended, potentially carrying contaminants.
Correct Answer: B. Reverse flow of water into potable system
3. The two main types of backflow are:
A. Thermal and hydraulic
B. Mechanical and chemical
C. Backpressure and backsiphonage
D. Direct and indirect
Rationale: Backflow occurs either due to pressure increase
downstream (backpressure) or vacuum conditions
(backsiphonage).
Correct Answer: C. Backpressure and backsiphonage
4. Backsiphonage occurs when:
A. Downstream pressure is higher than upstream
B. A pump increases pressure
C. Atmospheric pressure exceeds system pressure
D. Water temperature drops
Rationale: Backsiphonage is caused by a negative pressure
(vacuum) in the supply line.
Correct Answer: C. Atmospheric pressure exceeds system
pressure
,5. Backpressure occurs when:
A. Upstream pressure exceeds downstream pressure
B. Downstream pressure exceeds supply pressure
C. Flow stops completely
D. Air enters the system
Rationale: Backpressure results when downstream pressure
becomes greater than supply pressure, forcing reversal.
Correct Answer: B. Downstream pressure exceeds supply
pressure
6. Which device is designed for high hazard protection only?
A. Dual check valve
B. Atmospheric vacuum breaker
C. Reduced Pressure Zone (RPZ) assembly
D. Hose bibb vacuum breaker
Rationale: RPZ assemblies are used where high health hazards
exist due to their superior protection level.
Correct Answer: C. Reduced Pressure Zone (RPZ) assembly
7. A double check valve assembly is typically used for:
A. High hazard applications
B. Low hazard applications
C. Industrial chemical systems only
D. Fire hydrants only
, Rationale: Double check valves are suitable for non-health
hazard (low hazard) conditions.
Correct Answer: B. Low hazard applications
8. A reduced pressure zone (RPZ) valve protects by:
A. Increasing flow rate
B. Creating a pressure differential and relief discharge
C. Blocking all flow permanently
D. Measuring contamination levels
Rationale: RPZs discharge water when pressure conditions
indicate potential backflow.
Correct Answer: B. Creating a pressure differential and relief
discharge
9. Which component is NOT part of an RPZ assembly?
A. Differential relief valve
B. Two check valves
C. Isolation valves
D. Pressure booster pump
Rationale: RPZ assemblies do not include pumps; they include
two check valves and a relief valve.
Correct Answer: D. Pressure booster pump
10. The most common cause of backflow incidents is:
TESTER CERTIFICATION EXAM QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS) Q&A
2026 |INSTANT DOWNLOAD PDF
1. What is the primary purpose of a backflow prevention
assembly?
A. Increase water pressure
B. Prevent contamination of potable water
C. Filter sediment from water
D. Measure water flow
Rationale: Backflow prevention assemblies are designed to
stop reverse flow that could introduce contaminants into clean
water supplies.
Correct Answer: B. Prevent contamination of potable water
2. Backflow is defined as:
A. Forward flow of water
B. Reverse flow of water into potable system
C. Increased pressure in pipes
D. Water leakage from fixtures
,Rationale: Backflow occurs when water flows in the opposite
direction from intended, potentially carrying contaminants.
Correct Answer: B. Reverse flow of water into potable system
3. The two main types of backflow are:
A. Thermal and hydraulic
B. Mechanical and chemical
C. Backpressure and backsiphonage
D. Direct and indirect
Rationale: Backflow occurs either due to pressure increase
downstream (backpressure) or vacuum conditions
(backsiphonage).
Correct Answer: C. Backpressure and backsiphonage
4. Backsiphonage occurs when:
A. Downstream pressure is higher than upstream
B. A pump increases pressure
C. Atmospheric pressure exceeds system pressure
D. Water temperature drops
Rationale: Backsiphonage is caused by a negative pressure
(vacuum) in the supply line.
Correct Answer: C. Atmospheric pressure exceeds system
pressure
,5. Backpressure occurs when:
A. Upstream pressure exceeds downstream pressure
B. Downstream pressure exceeds supply pressure
C. Flow stops completely
D. Air enters the system
Rationale: Backpressure results when downstream pressure
becomes greater than supply pressure, forcing reversal.
Correct Answer: B. Downstream pressure exceeds supply
pressure
6. Which device is designed for high hazard protection only?
A. Dual check valve
B. Atmospheric vacuum breaker
C. Reduced Pressure Zone (RPZ) assembly
D. Hose bibb vacuum breaker
Rationale: RPZ assemblies are used where high health hazards
exist due to their superior protection level.
Correct Answer: C. Reduced Pressure Zone (RPZ) assembly
7. A double check valve assembly is typically used for:
A. High hazard applications
B. Low hazard applications
C. Industrial chemical systems only
D. Fire hydrants only
, Rationale: Double check valves are suitable for non-health
hazard (low hazard) conditions.
Correct Answer: B. Low hazard applications
8. A reduced pressure zone (RPZ) valve protects by:
A. Increasing flow rate
B. Creating a pressure differential and relief discharge
C. Blocking all flow permanently
D. Measuring contamination levels
Rationale: RPZs discharge water when pressure conditions
indicate potential backflow.
Correct Answer: B. Creating a pressure differential and relief
discharge
9. Which component is NOT part of an RPZ assembly?
A. Differential relief valve
B. Two check valves
C. Isolation valves
D. Pressure booster pump
Rationale: RPZ assemblies do not include pumps; they include
two check valves and a relief valve.
Correct Answer: D. Pressure booster pump
10. The most common cause of backflow incidents is:
