Plumber Red Seal · Question
According to the NPC, when a building drain is located below the level of the adjoining street but is able to drain by gravity to the building sewer, what specific protection device is required before the drain connects to the building sewer?
The NPC requires a backwater valve to be installed in the building drain to protect against sewage backup from the public sewer, especially when the fixture or
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Question: According to the NPC, when a building drain is located below the level of the adjoining street but is able to drain by gravity to the building sewer, what specific protection device is required before the drain connects to the building sewer?
Answer options: ✅ A backwater valve
- A sump pump and pit
- A storm sewer interceptor
- A horizontally installed check valve
Correct answer: A backwater valve
Explanation: The NPC requires a backwater valve to be installed in the building drain to protect against sewage backup from the public sewer, especially when the fixture or drain is located below street level.
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