Legionella sampling does not mean testing every tap in the building. Sampling points are chosen to give a useful picture of how your water system is performing, and the choice should follow your risk assessment.
How points are usually chosen
- The risk assessment leads. It shows where water could stagnate, run cool or hot in the wrong places or reach vulnerable people.
- Representative outlets across the building, such as the furthest taps and showers from the tanks and heaters.
- Little-used outlets where water may sit still. See our guide on dead legs and little-used outlets.
- Return and storage points where the plant allows, such as hot water cylinders and tanks.
- Outlets near higher-risk people, for example in healthcare or care settings, where HPSC guidance applies.
Good to know
- A result applies to the point sampled and the conditions on the day, so it is read alongside temperatures and records.
- Samples are collected carefully and sent to a laboratory. Ours go to an independent accredited laboratory.
- Sampling is not a substitute for control measures. See sampling vs risk assessment and how often sampling should be done.
Your duties
Under the Safety, Health and Welfare at Work Act 2005, employers must manage risks to the health of employees and others affected by their activities, which includes risks from water systems. The HPSC National Guidelines for the Control of Legionellosis in Ireland (2009) give practical guidance.
Talk to Safer Solutions
A legionella risk assessment reviews your whole water system and gives you practical, prioritised recommendations. Where sampling is needed, samples go to an independent accredited laboratory. Call 086 275 9728 or email info@safersolutions.ie for a friendly chat. Browse our fire and legionella guides.