15/09/2026
If you run a commercial facility or manage rental properties, you know that Legionella Risk Assessments and water checks are mandatory—but what does the process look like in practice?
It’s much more than just sticking a thermometer under a tap! Here is a look behind the scenes at how we test and protect your water systems:
1️⃣ Temperature Monitoring & Sentinel Taps: We check "sentinel outlets" (the nearest and furthest taps from your heat source) to ensure hot water reaches at least 50°C within 1 minute, and cold water stays below 20°C after 2 minutes. Legionella bacteria thrive between 20°C and 45°C, so strict temperature control is your first line of defence.
2️⃣ Calorifier & Storage Tank Inspections: We inspect hot water cylinders (calorifiers) to ensure stored water stays at a minimum of 60°C. We also check cold water storage tanks for physical integrity, tight-fitting lids, and cleanliness.
3️⃣ Identifying Stagnation & Infrequently Used Outlets: Dead legs in pipework or rarely used taps create prime conditions for bacteria to grow. We map out high-risk areas and advise on proper flushing schedules.
4️⃣ Microbiological Sampling (When Required): If high-risk conditions or vulnerable occupants are present, we take sterile water samples and send them to a UKAS-accredited laboratory for full microbiological analysis.
📋 Is your water hygiene testing up to date?
Keeping your site safe doesn't have to be complicated. Download our Free Workplace & Rental Property Fire & Water Safety Compliance Checklist to keep all your testing schedules organised and audit-ready.
👉 Get your free copy here: https://www.fwsservices.co.uk/fire-water-compliance-checklist/.