Plumber Red Seal · Question
A plumbing technician is troubleshooting a persistent odour issue in a residential basement. They discover a floor drain that rarely sees water usage. What is the most likely cause for the odour?
A dry trap seal is the most common cause of sewer gas odours from fixtures that are infrequently used, as the water in the trap evaporates over time, breaking t
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Question: A plumbing technician is troubleshooting a persistent odour issue in a residential basement. They discover a floor drain that rarely sees water usage. What is the most likely cause for the odour?
Answer options:
- A cracked drain tile allowing sewer gas entry.
- A blocked vent pipe preventing air circulation. ✅ A dry trap seal allowing sewer gas to escape.
- A corroded cleanout plug leaking odours.
Correct answer: A dry trap seal allowing sewer gas to escape.
Explanation: A dry trap seal is the most common cause of sewer gas odours from fixtures that are infrequently used, as the water in the trap evaporates over time, breaking the seal. While other issues can cause odours, a dry trap seal is directly related to infrequent use. A cracked drain tile is for weeping tiles, not DWV systems.
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