CSA Z240 RV Water Supply and Waste
Systems Exam Practice Questions And
Correct Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
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1. In accordance with CSA Z240 standards, what is the primary purpose
of the potable water system in a recreational vehicle (RV)?
A. To store wastewater for disposal
B. To supply safe drinking water to fixtures
C. To regulate fuel distribution
D. To manage electrical load
B. To supply safe drinking water to fixtures
The potable water system is designed specifically to deliver clean and
safe drinking water to all fixtures within the RV, ensuring compliance
with health and safety standards.
,2. Which material is commonly approved for potable water piping in RV
systems under CSA Z240 requirements?
A. Lead piping
B. Galvanized steel
C. Cross-linked polyethylene (PEX)
D. Cast iron
C. Cross-linked polyethylene (PEX)
PEX is widely accepted due to its flexibility, resistance to corrosion,
and safety for potable water use, unlike materials such as lead or
cast iron.
3. What is the minimum requirement for labeling potable water tanks in
an RV?
A. “Non-potable water”
B. “Fuel tank”
C. “Potable water only”
D. “Storage container”
C. “Potable water only”
Clear labeling ensures that users understand the intended use of the
tank and prevents contamination from improper usage.
4. What is the primary function of a backflow prevention device in RV
water systems?
A. Increase water pressure
B. Prevent reverse flow contamination
, C. Filter sediments
D. Heat water
B. Prevent reverse flow contamination
Backflow prevention devices ensure that contaminated water does
not flow backward into the clean water supply, protecting potable
water integrity.
5. Which component is responsible for maintaining consistent water
pressure in the RV plumbing system?
A. Drain valve
B. Water pump
C. Holding tank
D. Sewer hose
B. Water pump
The water pump regulates and maintains consistent pressure when
drawing water from the onboard tank to fixtures.
6. What is the main purpose of a gray water tank in an RV?
A. Store drinking water
B. Collect wastewater from toilets
C. Collect wastewater from sinks and showers
D. Store fuel
C. Collect wastewater from sinks and showers
Gray water tanks are specifically designed to collect wastewater
from non-toilet sources such as sinks and showers.
, 7. What type of waste is stored in a black water tank?
A. Rainwater
B. Drinking water
C. Toilet waste
D. Engine coolant
C. Toilet waste
Black water tanks are designated for sewage waste from toilets and
must be handled with strict sanitation procedures.
8. Which valve controls the discharge of wastewater from RV holding
tanks?
A. Pressure valve
B. Shut-off valve
C. Dump valve
D. Relief valve
C. Dump valve
Dump valves allow controlled release of wastewater from gray and
black tanks into appropriate disposal systems.
9. What is the recommended slope for RV drain lines to ensure proper
wastewater flow?
A. 1 mm per meter
B. 10 mm per meter
C. 20 mm per meter
D. No slope required
Systems Exam Practice Questions And
Correct Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
1. In accordance with CSA Z240 standards, what is the primary purpose
of the potable water system in a recreational vehicle (RV)?
A. To store wastewater for disposal
B. To supply safe drinking water to fixtures
C. To regulate fuel distribution
D. To manage electrical load
B. To supply safe drinking water to fixtures
The potable water system is designed specifically to deliver clean and
safe drinking water to all fixtures within the RV, ensuring compliance
with health and safety standards.
,2. Which material is commonly approved for potable water piping in RV
systems under CSA Z240 requirements?
A. Lead piping
B. Galvanized steel
C. Cross-linked polyethylene (PEX)
D. Cast iron
C. Cross-linked polyethylene (PEX)
PEX is widely accepted due to its flexibility, resistance to corrosion,
and safety for potable water use, unlike materials such as lead or
cast iron.
3. What is the minimum requirement for labeling potable water tanks in
an RV?
A. “Non-potable water”
B. “Fuel tank”
C. “Potable water only”
D. “Storage container”
C. “Potable water only”
Clear labeling ensures that users understand the intended use of the
tank and prevents contamination from improper usage.
4. What is the primary function of a backflow prevention device in RV
water systems?
A. Increase water pressure
B. Prevent reverse flow contamination
, C. Filter sediments
D. Heat water
B. Prevent reverse flow contamination
Backflow prevention devices ensure that contaminated water does
not flow backward into the clean water supply, protecting potable
water integrity.
5. Which component is responsible for maintaining consistent water
pressure in the RV plumbing system?
A. Drain valve
B. Water pump
C. Holding tank
D. Sewer hose
B. Water pump
The water pump regulates and maintains consistent pressure when
drawing water from the onboard tank to fixtures.
6. What is the main purpose of a gray water tank in an RV?
A. Store drinking water
B. Collect wastewater from toilets
C. Collect wastewater from sinks and showers
D. Store fuel
C. Collect wastewater from sinks and showers
Gray water tanks are specifically designed to collect wastewater
from non-toilet sources such as sinks and showers.
, 7. What type of waste is stored in a black water tank?
A. Rainwater
B. Drinking water
C. Toilet waste
D. Engine coolant
C. Toilet waste
Black water tanks are designated for sewage waste from toilets and
must be handled with strict sanitation procedures.
8. Which valve controls the discharge of wastewater from RV holding
tanks?
A. Pressure valve
B. Shut-off valve
C. Dump valve
D. Relief valve
C. Dump valve
Dump valves allow controlled release of wastewater from gray and
black tanks into appropriate disposal systems.
9. What is the recommended slope for RV drain lines to ensure proper
wastewater flow?
A. 1 mm per meter
B. 10 mm per meter
C. 20 mm per meter
D. No slope required
