ONTARIO BACKFLOW PREVENTION TESTER CERTIFICATION EXAM] QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A |LATEST EXAM UPDATE 2026/2027
SECTION ONE: QUESTIONS 1–100
Question 1
What is the primary purpose of a cross-connection control program in Ontario?
A. To ensure water pressure is maintained in all municipal buildings
B. To prevent the contamination of the potable water supply from non-potable sources
C. To reduce the cost of water treatment for industrial facilities
D. To monitor the temperature of water in distribution systems
🟢 B. To prevent the contamination of the potable water supply from non-potable sources
🔴 RATIONALE: The fundamental goal of cross-connection control is to protect the drinking water supply by
preventing backflow from non-potable sources through unprotected cross-connections . While maintaining
water pressure and monitoring are important, contamination prevention is the core purpose of these programs.
Question 2
According to the Ontario Building Code and CSA standards, premise isolation is required for which of the
,following service connection classifications?
A. Only severe hazard classifications
B. Only moderate hazard classifications
C. Severe and moderate hazard classifications
D. All residential single-family dwellings
🟢 C. Severe and moderate hazard classifications
🔴 RATIONALE: The Backflow Prevention Program requires premise isolation for all severe and moderate service
connections to protect the municipal water supply . These classifications present a higher probability of
contaminating the distribution system should a backflow event occur.
Question 3
Backflow caused by a downstream pressure higher than the supply pressure is known as:
A. Back-siphonage
B. Cross-connection
C. Backpressure
D. Reverse flow
🟢 C. Backpressure
🔴 RATIONALE: Backpressure is the reversal of normal flow due to pressure higher than the supply pressure,
which can result from pumps, temperature increases in boilers, or elevated tanks . Back-siphonage, by contrast,
is caused by a negative pressure or vacuum in the supply piping.
,Question 4
A device used on the discharge side of the last control valve on a laboratory faucet is classified under which CSA
B64 standard?
A. CSA B64.7 (Laboratory faucet vacuum breakers)
B. CSA B64.1.2 (Pressure vacuum breakers)
C. CSA B64.2 (Hose connection vacuum breakers)
D. CSA B64.4 (Reduced pressure principle backflow preventers)
🟢 A. CSA B64.7 (Laboratory faucet vacuum breakers)
🔴 RATIONALE: CSA B64.7 specifically covers vacuum breakers designed for use on laboratory faucets. These
devices are intended to be installed on the discharge side of the last control valve and are not designed for use
under constant pressure conditions .
Question 5
What is the fundamental difference between a backflow prevention assembly and a backflow prevention device?
A. Assemblies are larger and more expensive than devices
B. Assemblies are testable in the field, while devices are generally non-testable
C. Devices are always installed indoors, while assemblies are installed outdoors
D. Assemblies are certified in Canada, while devices are certified in the US
🟢 B. Assemblies are testable in the field, while devices are generally non-testable
🔴 RATIONALE: A key distinction in the industry is that assemblies are designed with test cocks and other
features that allow for field testing to verify proper function, whereas devices are typically not field-testable and
often rely on non-mechanical principles .
, Question 6
Which of the following pieces of legislation is PRIMARILY responsible for setting out technical requirements for
backflow prevention in Ontario's buildings?
A. The Safe Drinking Water Act, 2002
B. The Ontario Building Code (Ontario Regulation 332/12)
C. The Municipal Act, 2001
D. The Fire Protection and Prevention Act, 1997
🟢 B. The Ontario Building Code (Ontario Regulation 332/12)
🔴 RATIONALE: The Ontario Building Code is the primary regulation that sets the technical and administrative
requirements for the design and construction of buildings, including plumbing provisions related to backflow
prevention . Part 7 of the Code specifically deals with plumbing and potable water system protection .
Question 7
An atmospheric vacuum breaker (AVB) provides protection against:
A. Both backpressure and back-siphonage
B. Backpressure only
C. Back-siphonage only
D. Neither backpressure nor back-siphonage
🟢 C. Back-siphonage only
🔴 RATIONALE: An Atmospheric Vacuum Breaker (AVB) is designed to protect against back-siphonage only. It
(VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A |LATEST EXAM UPDATE 2026/2027
SECTION ONE: QUESTIONS 1–100
Question 1
What is the primary purpose of a cross-connection control program in Ontario?
A. To ensure water pressure is maintained in all municipal buildings
B. To prevent the contamination of the potable water supply from non-potable sources
C. To reduce the cost of water treatment for industrial facilities
D. To monitor the temperature of water in distribution systems
🟢 B. To prevent the contamination of the potable water supply from non-potable sources
🔴 RATIONALE: The fundamental goal of cross-connection control is to protect the drinking water supply by
preventing backflow from non-potable sources through unprotected cross-connections . While maintaining
water pressure and monitoring are important, contamination prevention is the core purpose of these programs.
Question 2
According to the Ontario Building Code and CSA standards, premise isolation is required for which of the
,following service connection classifications?
A. Only severe hazard classifications
B. Only moderate hazard classifications
C. Severe and moderate hazard classifications
D. All residential single-family dwellings
🟢 C. Severe and moderate hazard classifications
🔴 RATIONALE: The Backflow Prevention Program requires premise isolation for all severe and moderate service
connections to protect the municipal water supply . These classifications present a higher probability of
contaminating the distribution system should a backflow event occur.
Question 3
Backflow caused by a downstream pressure higher than the supply pressure is known as:
A. Back-siphonage
B. Cross-connection
C. Backpressure
D. Reverse flow
🟢 C. Backpressure
🔴 RATIONALE: Backpressure is the reversal of normal flow due to pressure higher than the supply pressure,
which can result from pumps, temperature increases in boilers, or elevated tanks . Back-siphonage, by contrast,
is caused by a negative pressure or vacuum in the supply piping.
,Question 4
A device used on the discharge side of the last control valve on a laboratory faucet is classified under which CSA
B64 standard?
A. CSA B64.7 (Laboratory faucet vacuum breakers)
B. CSA B64.1.2 (Pressure vacuum breakers)
C. CSA B64.2 (Hose connection vacuum breakers)
D. CSA B64.4 (Reduced pressure principle backflow preventers)
🟢 A. CSA B64.7 (Laboratory faucet vacuum breakers)
🔴 RATIONALE: CSA B64.7 specifically covers vacuum breakers designed for use on laboratory faucets. These
devices are intended to be installed on the discharge side of the last control valve and are not designed for use
under constant pressure conditions .
Question 5
What is the fundamental difference between a backflow prevention assembly and a backflow prevention device?
A. Assemblies are larger and more expensive than devices
B. Assemblies are testable in the field, while devices are generally non-testable
C. Devices are always installed indoors, while assemblies are installed outdoors
D. Assemblies are certified in Canada, while devices are certified in the US
🟢 B. Assemblies are testable in the field, while devices are generally non-testable
🔴 RATIONALE: A key distinction in the industry is that assemblies are designed with test cocks and other
features that allow for field testing to verify proper function, whereas devices are typically not field-testable and
often rely on non-mechanical principles .
, Question 6
Which of the following pieces of legislation is PRIMARILY responsible for setting out technical requirements for
backflow prevention in Ontario's buildings?
A. The Safe Drinking Water Act, 2002
B. The Ontario Building Code (Ontario Regulation 332/12)
C. The Municipal Act, 2001
D. The Fire Protection and Prevention Act, 1997
🟢 B. The Ontario Building Code (Ontario Regulation 332/12)
🔴 RATIONALE: The Ontario Building Code is the primary regulation that sets the technical and administrative
requirements for the design and construction of buildings, including plumbing provisions related to backflow
prevention . Part 7 of the Code specifically deals with plumbing and potable water system protection .
Question 7
An atmospheric vacuum breaker (AVB) provides protection against:
A. Both backpressure and back-siphonage
B. Backpressure only
C. Back-siphonage only
D. Neither backpressure nor back-siphonage
🟢 C. Back-siphonage only
🔴 RATIONALE: An Atmospheric Vacuum Breaker (AVB) is designed to protect against back-siphonage only. It
