LegioCheck — Legionella Monitoring Resources

LegioCheck is a record-keeping and reminder tool — not a risk assessment. It helps you record and schedule your own Legionella monitoring tasks and keep the records ACoP L8 asks the responsible person to retain. It is not legal or safety advice and does not guarantee compliance with ACoP L8, HSG274, COSHH or any regulation. The temperatures and frequencies shown are general guidance values — your system's actual control scheme must be set by a competent person and your own risk assessment. You are responsible for the accuracy and sufficiency of your monitoring and records.

The legal and code-of-practice background

• HSE — Legionnaires' disease: The control of legionella bacteria in water systems (ACoP L8) — the Approved Code of Practice the HSE enforces against. It sets the duty to identify and assess the risk, manage and control it, and keep records.
• HSE — HSG274 Technical Guidance (Parts 1–3) — the technical guidance behind L8; Part 2 covers hot and cold water systems, monitoring tasks and temperatures.
• HSE — The responsible person (dutyholder) — who must keep the monitoring regime and the records.

Reference monitoring values (guidance only)

• Hot sentinel outlets (monthly): hot water should reach ≥ 50 °C at the outlet within one minute of running.
• Cold sentinel outlets (monthly): cold water should be ≤ 20 °C at the outlet within two minutes of running.
• Calorifier (monthly spot check): flow ≥ 60 °C, return ≥ 50 °C; hot water is stored at ≥ 60 °C.
• Cold-water storage tank (six-monthly): ≤ 20 °C throughout, with a visual inspection.
• Little-used outlets (weekly): flush through for several minutes to prevent stagnation.
• TMVs (annual): service — dismantle, clean, disinfect and function-check.
• Showerheads / spray outlets (quarterly): descale and disinfect.
• Thermal disinfection (reference): ≥ 60 °C at every outlet held for 5 minutes.
• These are starting-point figures from HSG274 Part 2 — always confirm against the current guidance and your own risk assessment. LegioCheck shows them as inline reference values and never marks a reading as a pass or fail.

Keep your records

ACoP L8 asks the responsible person to retain monitoring records for five years. After an incident or during an HSE, CQC or insurer review, the maintained monitoring log is the evidence that the control scheme was followed. Keeping a complete, dated record — sentinel temperatures, flushing, tank checks, TMV service and any remedial action — is exactly what LegioCheck is built to help you do. The control scheme, the readings and the judgement remain yours.

Further reading

• HSE — Legionnaires' disease landing page
• Control of Substances Hazardous to Health Regulations 2002 (COSHH)

Honest scope

These resources are starting points, not a substitute for HSG274, the ACoP, your training, or your own risk assessment. LegioCheck records what you enter and prepares a monitoring PDF from it; it cannot tell you whether a particular water system is safe. That judgement is yours and your competent person's.