NYC DEP Backflow Prevention Device
Inspector Certification Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. Which of the following best describes the primary purpose of a
backflow prevention device in a municipal water system?
A. To increase water pressure in residential plumbing systems
B. To prevent contaminated water from reversing into the potable water
supply
C. To filter sediments and improve taste in drinking water
D. To measure water consumption at service connections
Correct Answer: B. The primary function of a backflow prevention device is
to prevent contaminated or non-potable water from flowing backward into
the public drinking water system, thereby protecting public health and
maintaining water quality standards.
2. Under NYC DEP requirements, which professional is primarily
responsible for preparing and submitting backflow prevention plans
for approval?
,A. Licensed Master Plumber only
B. Certified Backflow Tester
C. Professional Engineer or Registered Architect
D. Property tenant or building occupant
Correct Answer: C. A Professional Engineer (PE) or Registered Architect (RA)
is required to design and submit backflow prevention plans for DEP
approval before installation can proceed.
3. After installation of a backflow prevention device, what is the required
next step before it is considered compliant for operation?
A. Immediate annual testing only
B. Inspection by a tenant representative
C. Initial testing by a certified backflow tester
D. Submission of water usage reports
Correct Answer: C. Once installed, the device must undergo an initial test
by a New York State certified backflow tester to confirm proper installation
and functionality.
4. What is the required frequency for testing an approved backflow
prevention device after initial certification?
A. Every 6 months
B. Every 12 months
C. Every 5 years
D. Only upon system failure
Correct Answer: B. Backflow prevention devices must be tested annually
(every 12 months) by a certified tester to ensure continued compliance and
safety.
5. Which of the following is most likely to require a backflow prevention
device under NYC DEP rules?
,A. Residential homes without water treatment systems
B. Properties with irrigation systems or water-cooled equipment
C. Vacant land with no plumbing infrastructure
D. Private vehicles using city water only for washing
Correct Answer: B. Properties such as those with irrigation systems, water-
cooled equipment, or other potential cross-connection risks are required to
install backflow prevention devices.
6. What is the primary consequence of failing to install a required
backflow prevention device in NYC?
A. Reduced water billing rates
B. Automatic property tax reduction
C. Water service disconnection and potential penalties
D. Free installation by DEP
Correct Answer: C. Failure to install a required device may result in
violations, fines, cease-and-desist orders, or disconnection of water service.
7. Which type of professional must physically install a backflow
prevention device according to NYC DEP procedures?
A. Certified Backflow Tester
B. Licensed Master Plumber
C. Property manager
D. Building inspector trainee
Correct Answer: B. Installation must be carried out by a Licensed Master
Plumber (LMP), as required under NYC DEP regulations.
8. What is the main role of the New York State Department of Health in
backflow prevention certification?
A. Approving plumbing materials used in installations
B. Issuing certification for individuals who test backflow devices
, C. Funding municipal water infrastructure projects
D. Installing devices in residential homes
Correct Answer: B. The NYSDOH certifies individuals through approved
training programs to perform testing of backflow prevention devices.
9. Which condition would most likely require multiple backflow
prevention devices on a single property?
A. A building with a single water service line
B. A property with multiple water service connections
C. A house with no plumbing fixtures
D. A property using bottled water exclusively
Correct Answer: B. Properties with multiple water service lines are required
to install a backflow prevention device on each line to ensure full
protection.
10. What is the key reason NYC DEP mandates backflow prevention
testing?
A. To reduce household water bills
B. To monitor seasonal water usage trends
C. To ensure devices function properly and prevent contamination risks
D. To replace aging plumbing infrastructure
Correct Answer: C. Regular testing ensures the device is functioning
correctly, which is essential for preventing contamination of the public
water supply.
11. Who is typically responsible for submitting the initial test report
after installation?
A. Certified tester alone without signatures
B. Only the property tenant
Inspector Certification Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. Which of the following best describes the primary purpose of a
backflow prevention device in a municipal water system?
A. To increase water pressure in residential plumbing systems
B. To prevent contaminated water from reversing into the potable water
supply
C. To filter sediments and improve taste in drinking water
D. To measure water consumption at service connections
Correct Answer: B. The primary function of a backflow prevention device is
to prevent contaminated or non-potable water from flowing backward into
the public drinking water system, thereby protecting public health and
maintaining water quality standards.
2. Under NYC DEP requirements, which professional is primarily
responsible for preparing and submitting backflow prevention plans
for approval?
,A. Licensed Master Plumber only
B. Certified Backflow Tester
C. Professional Engineer or Registered Architect
D. Property tenant or building occupant
Correct Answer: C. A Professional Engineer (PE) or Registered Architect (RA)
is required to design and submit backflow prevention plans for DEP
approval before installation can proceed.
3. After installation of a backflow prevention device, what is the required
next step before it is considered compliant for operation?
A. Immediate annual testing only
B. Inspection by a tenant representative
C. Initial testing by a certified backflow tester
D. Submission of water usage reports
Correct Answer: C. Once installed, the device must undergo an initial test
by a New York State certified backflow tester to confirm proper installation
and functionality.
4. What is the required frequency for testing an approved backflow
prevention device after initial certification?
A. Every 6 months
B. Every 12 months
C. Every 5 years
D. Only upon system failure
Correct Answer: B. Backflow prevention devices must be tested annually
(every 12 months) by a certified tester to ensure continued compliance and
safety.
5. Which of the following is most likely to require a backflow prevention
device under NYC DEP rules?
,A. Residential homes without water treatment systems
B. Properties with irrigation systems or water-cooled equipment
C. Vacant land with no plumbing infrastructure
D. Private vehicles using city water only for washing
Correct Answer: B. Properties such as those with irrigation systems, water-
cooled equipment, or other potential cross-connection risks are required to
install backflow prevention devices.
6. What is the primary consequence of failing to install a required
backflow prevention device in NYC?
A. Reduced water billing rates
B. Automatic property tax reduction
C. Water service disconnection and potential penalties
D. Free installation by DEP
Correct Answer: C. Failure to install a required device may result in
violations, fines, cease-and-desist orders, or disconnection of water service.
7. Which type of professional must physically install a backflow
prevention device according to NYC DEP procedures?
A. Certified Backflow Tester
B. Licensed Master Plumber
C. Property manager
D. Building inspector trainee
Correct Answer: B. Installation must be carried out by a Licensed Master
Plumber (LMP), as required under NYC DEP regulations.
8. What is the main role of the New York State Department of Health in
backflow prevention certification?
A. Approving plumbing materials used in installations
B. Issuing certification for individuals who test backflow devices
, C. Funding municipal water infrastructure projects
D. Installing devices in residential homes
Correct Answer: B. The NYSDOH certifies individuals through approved
training programs to perform testing of backflow prevention devices.
9. Which condition would most likely require multiple backflow
prevention devices on a single property?
A. A building with a single water service line
B. A property with multiple water service connections
C. A house with no plumbing fixtures
D. A property using bottled water exclusively
Correct Answer: B. Properties with multiple water service lines are required
to install a backflow prevention device on each line to ensure full
protection.
10. What is the key reason NYC DEP mandates backflow prevention
testing?
A. To reduce household water bills
B. To monitor seasonal water usage trends
C. To ensure devices function properly and prevent contamination risks
D. To replace aging plumbing infrastructure
Correct Answer: C. Regular testing ensures the device is functioning
correctly, which is essential for preventing contamination of the public
water supply.
11. Who is typically responsible for submitting the initial test report
after installation?
A. Certified tester alone without signatures
B. Only the property tenant
