Foul Drain Smell

Does this sound like your situation?

What can cause smelly drain?

There is rarely one universal cause. Common possibilities range from a local fixture problem to a deeper issue in the pipework, drainage or hot water system. The safest approach is to look for visible clues, avoid dismantling anything hazardous, and escalate quickly if water, gas, sewage or electrical equipment is involved.

Safe checks you can make first

• Check whether the problem affects one fixture or several.
• Look for active leaking, unusual smells, noises, discolouration or water damage.
• Note when the problem started and whether it is getting worse.
• If water is escaping rapidly and you can safely access the main shut-off, turn it off.

When should you call a plumber?

Call when the issue is persistent, recurring, spreading, causing damage, or requires work on regulated plumbing or gas systems. A useful first description includes the affected fixture, symptoms, duration and your location.

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• Sewer smell in house
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DIY checklist

Safe first checks for drain odours. These checks are intended to help you understand the symptoms without taking apart regulated or hazardous equipment.

1. Run water through an infrequently used drain to see whether the smell changes.
2. Clean visible debris from the drain cover or strainer.
3. Check under the sink for leaks or dampness around the waste connections.
4. If several drains smell at once, or the odour resembles sewage, get professional advice rather than masking the smell.

Frequently asked questions