How to Fix an Outside Drain Smell

Overview

A smelly outside drain can be unpleasant. This guide covers diagnosing and fixing the issue.

Step-by-Step Fix

1. Carefully lift the drain cover and look for any visible blockages such as leaves, dirt, or grease around the opening. Using gloved hands or a small trowel, carefully remove all debris and dispose of it in your household waste, then replace the cover securely.
2. Check if the U-bend or P-trap (the curved pipe designed to hold water) within the drain system appears dry or empty, as a lack of water allows odours to escape. If it's dry, the seal is broken, which is likely the source of the smell.
3. Boil a kettle of water, then pour it slowly and carefully into the drain from a safe distance, avoiding splashes. This helps to dislodge minor grease build-ups and check if the water level in the trap returns to normal, indicating a potential improvement.
4. If the smell persists, choose a biological drain cleaner designed to break down organic matter in outside drains, following the manufacturer's instructions for application and safety. Apply the cleaner as directed and allow it to work for the recommended time before checking for a reduction in the odour.
5. If, after trying all these steps, the unpleasant smell continues, it's time to call a professional plumber. They have specialist equipment and expertise to diagnose and fix more complex issues, such as damaged pipes or deeper blockages.

Common Symptoms & Diagnostic Resolutions

Review the common error codes and operating symptoms below to quickly identify the root cause of the fault before ordering replacement parts.

Frequently Asked Questions