BACKFLOW COMPREHENSIVE EXAM 2026
QUESTIONS AND ANSWERS FULL
SOLUTION GRADED A+
●● Backsiphonage.
Answer: The hydraulic condition resulting in backflow due to a
reduction in system pressure, which causes a sub-atmospheric pressure
(vacuum) to exist in the water system.
●● Bypass.
Answer: Any arrangement of pipes, plumbing or hoses designed to
divert the flow around an installed backflow device or assembly through
which the flow normally passes.
●● Check Valve.
Answer: A mechanical device designed to allow flow in one direction
only.
●● Containment.
Answer: A water purveyor's backflow prevention policy of installing a
backflow prevention device commensurate with the degree of hazard
after the termination of the distribution system (water meter) and prior to
any branches in the system.
, ●● Contaminant.
Answer: Any substance introduced into the public water system that will
cause illness or death.
●● Continuous Pressure.
Answer: A condition in which upstream pressure is applied for more
than 12 hours in a 24-hour period to a device or assembly.
●● Cross-Connection.
Answer: Any physical arrangement whereby a public water system is
connected, directly or indirectly, with any other water supply system,
sewer, drain, conduit, pool, storage reservoir, plumbing fixture or other
device which contains or may contain contaminated water.
●● Cross-Connection Control.
Answer: The use of assemblies, methods and procedures to prevent
contamination of a potable water supply through cross connections.
●● Degree of Hazard.
Answer: The danger posed by a particular substance or set of
circumstances.
●● Differential Pressure.
QUESTIONS AND ANSWERS FULL
SOLUTION GRADED A+
●● Backsiphonage.
Answer: The hydraulic condition resulting in backflow due to a
reduction in system pressure, which causes a sub-atmospheric pressure
(vacuum) to exist in the water system.
●● Bypass.
Answer: Any arrangement of pipes, plumbing or hoses designed to
divert the flow around an installed backflow device or assembly through
which the flow normally passes.
●● Check Valve.
Answer: A mechanical device designed to allow flow in one direction
only.
●● Containment.
Answer: A water purveyor's backflow prevention policy of installing a
backflow prevention device commensurate with the degree of hazard
after the termination of the distribution system (water meter) and prior to
any branches in the system.
, ●● Contaminant.
Answer: Any substance introduced into the public water system that will
cause illness or death.
●● Continuous Pressure.
Answer: A condition in which upstream pressure is applied for more
than 12 hours in a 24-hour period to a device or assembly.
●● Cross-Connection.
Answer: Any physical arrangement whereby a public water system is
connected, directly or indirectly, with any other water supply system,
sewer, drain, conduit, pool, storage reservoir, plumbing fixture or other
device which contains or may contain contaminated water.
●● Cross-Connection Control.
Answer: The use of assemblies, methods and procedures to prevent
contamination of a potable water supply through cross connections.
●● Degree of Hazard.
Answer: The danger posed by a particular substance or set of
circumstances.
●● Differential Pressure.
