A Simple Oversight… But a Common Risk

During a recent site visit, I came across something that’s often overlooked — a hose left permanently connected to a tap.

At first glance, it might seem harmless. After all, hoses are used regularly for cleaning, maintenance, or general site tasks.

However, from a water hygiene and Legionella control perspective, this is a known and preventable risk.

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Why Are Hoses a Legionella Risk?

Flexible hoses can create ideal conditions for bacterial growth if not properly managed. Here’s why:

1. Water Stagnation

When a hose remains connected but unused, water sits stagnant inside. This creates the perfect environment for microbial growth, including Legionella.

2. Favourable Temperatures

Hoses are often exposed to ambient temperatures, allowing water inside to warm into the 20–45°C range, which is ideal for Legionella proliferation.

3. Backflow Risks

Without appropriate backflow protection, contaminated water from the hose can potentially be drawn back into the main system.

4. Low Usage = Higher Risk

Ironically, hoses that are only used occasionally pose a greater risk. Infrequent use means longer stagnation periods and less regular flushing.

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Good Practice: How to Manage Hose Risks

Managing this risk is straightforward with the right controls in place:

✔ Remove hoses when not in use
Disconnecting eliminates stagnation within the hose.

✔ Drain and store properly
After use, empty the hose fully, coil it up, and store it in a cool environment.

✔ Install backflow prevention
Fit suitable devices such as double check valves to prevent contamination of the supply.

✔ Flush outlets regularly
Ensure taps used with hoses are included in routine flushing regimes.

✔ Include in your monitoring programme
Hoses and associated outlets should form part of your Legionella control scheme and inspections.

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Small Oversights, Big Risks

In my experience, it’s often the small, easily missed issues that present the biggest risks in water systems.

A simple connected hose might not raise immediate concerns — but over time, it can become a source of contamination if not properly managed.

Gardner Contracts Legionnaires Disease from Hose Pipe

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Final Thought

It’s worth taking a walk around your site today and asking:

How many hoses are still connected right now?

You might be surprised.