California Backflow Prevention
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
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1. In a potable water system, what is the primary purpose of a backflow
prevention assembly installed at the service connection to a building
with potential contamination hazards such as irrigation systems, fire
sprinklers, or chemical injection equipment?
A. To increase system water pressure and flow rate
B. To allow reverse flow during fire suppression events
C. To prevent contaminated water from reversing into the public potable
water supply
D. To regulate water temperature entering the building
,C
The primary purpose of a backflow prevention assembly is to protect the
public potable water system by preventing any reverse flow of
contaminated or non-potable water from entering it due to backpressure
or back-siphonage conditions.
2. Which backflow prevention device is specifically designed to provide
the highest level of protection and is typically required for severe
health hazard conditions involving toxic substances?
A. Double Check Valve Assembly (DCVA)
B. Pressure Vacuum Breaker (PVB)
C. Reduced Pressure Principle Assembly (RPZ)
D. Atmospheric Vacuum Breaker (AVB)
C
A Reduced Pressure Principle Assembly provides the highest level of
protection because it includes a relief valve that discharges water if either
check valve fails, preventing contaminated water from entering the
potable supply under all backflow conditions.
3. What condition best describes “back-siphonage” in a potable water
distribution system?
A. Forward flow caused by booster pumps
B. Reverse flow caused by downstream pressure exceeding supply pressure
,due to atmospheric vacuum
C. Chemical contamination entering through corrosion
D. Increased static pressure in the main line
B
Back-siphonage occurs when negative pressure or vacuum conditions in
the supply line cause water to flow backward, potentially drawing
contaminants into the potable system.
4. During testing of a Reduced Pressure Principle Assembly (RPZ), what is
the minimum acceptable differential pressure across the relief valve?
A. 1 psi
B. 2 psi
C. 0.5 psi
D. 5 psi
B
An RPZ relief valve must maintain at least 2 psi differential pressure to
ensure it will open properly under failure conditions and discharge
contaminated water safely.
5. Which organization publishes widely recognized standards used for
backflow prevention device testing procedures in the United States?
, A. NFPA
B. AWWA
C. OSHA
D. EPA only
B
The American Water Works Association (AWWA) provides standardized
testing and performance guidelines widely used for backflow prevention
assemblies and cross-connection control programs.
6. A Double Check Valve Assembly (DCVA) is generally approved for use
in which type of hazard condition?
A. High-health hazard toxic chemical systems
B. Severe radioactive contamination systems
C. Non-health or low-hazard non-toxic systems
D. Sewage treatment plant discharge systems
C
A DCVA is intended for non-health hazard or low-risk applications where
contaminants are not toxic but still require protection against backflow.
7. What is the most likely cause of a backflow prevention assembly
failing a field test due to leakage from the relief valve discharge line in
an RPZ?
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
Download Pdf
1. In a potable water system, what is the primary purpose of a backflow
prevention assembly installed at the service connection to a building
with potential contamination hazards such as irrigation systems, fire
sprinklers, or chemical injection equipment?
A. To increase system water pressure and flow rate
B. To allow reverse flow during fire suppression events
C. To prevent contaminated water from reversing into the public potable
water supply
D. To regulate water temperature entering the building
,C
The primary purpose of a backflow prevention assembly is to protect the
public potable water system by preventing any reverse flow of
contaminated or non-potable water from entering it due to backpressure
or back-siphonage conditions.
2. Which backflow prevention device is specifically designed to provide
the highest level of protection and is typically required for severe
health hazard conditions involving toxic substances?
A. Double Check Valve Assembly (DCVA)
B. Pressure Vacuum Breaker (PVB)
C. Reduced Pressure Principle Assembly (RPZ)
D. Atmospheric Vacuum Breaker (AVB)
C
A Reduced Pressure Principle Assembly provides the highest level of
protection because it includes a relief valve that discharges water if either
check valve fails, preventing contaminated water from entering the
potable supply under all backflow conditions.
3. What condition best describes “back-siphonage” in a potable water
distribution system?
A. Forward flow caused by booster pumps
B. Reverse flow caused by downstream pressure exceeding supply pressure
,due to atmospheric vacuum
C. Chemical contamination entering through corrosion
D. Increased static pressure in the main line
B
Back-siphonage occurs when negative pressure or vacuum conditions in
the supply line cause water to flow backward, potentially drawing
contaminants into the potable system.
4. During testing of a Reduced Pressure Principle Assembly (RPZ), what is
the minimum acceptable differential pressure across the relief valve?
A. 1 psi
B. 2 psi
C. 0.5 psi
D. 5 psi
B
An RPZ relief valve must maintain at least 2 psi differential pressure to
ensure it will open properly under failure conditions and discharge
contaminated water safely.
5. Which organization publishes widely recognized standards used for
backflow prevention device testing procedures in the United States?
, A. NFPA
B. AWWA
C. OSHA
D. EPA only
B
The American Water Works Association (AWWA) provides standardized
testing and performance guidelines widely used for backflow prevention
assemblies and cross-connection control programs.
6. A Double Check Valve Assembly (DCVA) is generally approved for use
in which type of hazard condition?
A. High-health hazard toxic chemical systems
B. Severe radioactive contamination systems
C. Non-health or low-hazard non-toxic systems
D. Sewage treatment plant discharge systems
C
A DCVA is intended for non-health hazard or low-risk applications where
contaminants are not toxic but still require protection against backflow.
7. What is the most likely cause of a backflow prevention assembly
failing a field test due to leakage from the relief valve discharge line in
an RPZ?
