Plumber Red Seal · Question
When is a backwater valve mandatory for a sanitary building drain?
The NPC requires a backwater valve to be installed when a fixture is located below the level of the adjacent street or public sewer to prevent sewage from backi
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Question: When is a backwater valve mandatory for a sanitary building drain?
Answer options:
- When the building has more than three storeys.
- When the building drain is constructed of PVC. ✅ When the fixture drain is located below the level of the adjoining street.
- When the total connected fixture unit load exceeds 500.
Correct answer: When the fixture drain is located below the level of the adjoining street.
Explanation: The NPC requires a backwater valve to be installed when a fixture is located below the level of the adjacent street or public sewer to prevent sewage from backing up into the building during a sewer surcharge event.
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