SENTINEL HOT OUTLET TEMPERATURE (Monthly): Record the date, time, outlet ID (nearest and furthest from the calorifier or cylinder), temperature reading in degrees Celsius, and the name of the person taking the reading. The target is 50 degrees C or above at the outlet within one minute of the tap running. If the reading is below 50 degrees C, log it as a FAIL, record the corrective action taken, and the date that action was completed. Sign every entry. Source: HSG274 Part 2, Table 2.1.
SENTINEL COLD OUTLET TEMPERATURE (Monthly): Record the date, time, outlet ID (nearest and furthest from the cold water storage tank), temperature reading in degrees Celsius, and the tester's name. Cold water must be at or below 20 degrees C at the outlet within two minutes of running. A reading above 20 degrees C is a FAIL: log it, raise a corrective action immediately, and record the outcome and sign-off date. Source: HSG274 Part 2, Table 2.1.
COLD WATER STORAGE TANK TEMPERATURE (Monthly, where physically accessible): At each monthly inspection, record the date, tank reference, temperature of the stored water, and the tester's name. Target is below 20 degrees C. If the reading exceeds 20 degrees C, treat as a FAIL: record the cause if known, the remedial action taken, and the date resolved. Source: HSG274 Part 2, Table 2.1.
HOT WATER STORAGE CALORIFIER OR CYLINDER TEMPERATURE (Monthly): Record the date, vessel reference, the flow and return temperatures, and the tester's name. Storage temperature should be 60 degrees C or above; return temperature should reach at least 50 degrees C. Log any deviation as a FAIL with corrective action and sign-off. Source: HSG274 Part 2, Table 2.1; L8 ACoP 2013, paragraph 2.54.
FLUSHING OF INFREQUENTLY USED OUTLETS (Weekly, for any outlet unused for seven days or more): Record the date, outlet ID, duration of flushing (run hot and cold for at least two minutes or until temperature stabilises), temperature achieved at the end of flushing, and the name of the person carrying out the task. Note whether the outlet is being decommissioned; if so, record that it has been capped and removed from the register. Source: HSG274 Part 2, paragraph 2.69.
SHOWERHEAD AND FLEXIBLE HOSE CLEAN AND DESCALE (Quarterly as a minimum): Record the date, shower ID, the operative's name, and the method used (dismantle, descale, disinfect in accordance with your written scheme). Note the condition found (scale level, biofilm visible, debris) and the condition left. If the head or hose was replaced, record the new component. Sign the entry. Source: HSG274 Part 2, Table 2.1; HSG274 Part 2, paragraph 2.101.
All checks done
Maintenance
Legionella Water Monitoring Logbook
This logbook is the duty holder's running proof that Legionella bacteria are being actively controlled in the building's water system, as required under the Health and Safety at Work etc. Act 1974, COSHH Regulations 2002, and the L8 Approved Code of Practice. Without it, an HSE inspector has no evidence that legal duties have been met, and a confirmed case of Legionnaires' disease on premises with no records can lead to prosecution, unlimited fines, and imprisonment for up to two years.
12 checksPDF + printReviewed August 2026
Built on published UK guidance Show sources
Health and Safety at Work etc. Act 1974, section 2 and section 33; Control of Substances Hazardous to Health Regulations 2002 (SI 2002/2677), regulation 7; Management of Health and Safety at Work Regulations 1999 (SI 1999/3242), regulation 3; Approved Code of Practice L8 'Legionnaires disease: The control of legionella bacteria in water systems' (4th edition, 2013), paragraphs 2.4 to 2.8, 2.53 to 2.54, 2.83 to 2.85; HSG274 Part 2 'The control of legionella bacteria in hot and cold water systems' (2014), Table 2.1, paragraphs 2.69, 2.97, 2.101
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12 things to check.
Everything that matters, nothing that does not. Here is the full list, exactly as it appears on the template.
1SENTINEL HOT OUTLET TEMPERATURE (Monthly): Record the date, time, outlet ID (nearest and furthest from the calorifier or cylinder), temperature reading in degrees Celsius, and the name of the person taking the reading. The target is 50 degrees C or above at the outlet within one minute of the tap running. If the reading is below 50 degrees C, log it as a FAIL, record the corrective action taken, and the date that action was completed. Sign every entry. Source: HSG274 Part 2, Table 2.1.
2SENTINEL COLD OUTLET TEMPERATURE (Monthly): Record the date, time, outlet ID (nearest and furthest from the cold water storage tank), temperature reading in degrees Celsius, and the tester's name. Cold water must be at or below 20 degrees C at the outlet within two minutes of running. A reading above 20 degrees C is a FAIL: log it, raise a corrective action immediately, and record the outcome and sign-off date. Source: HSG274 Part 2, Table 2.1.
3COLD WATER STORAGE TANK TEMPERATURE (Monthly, where physically accessible): At each monthly inspection, record the date, tank reference, temperature of the stored water, and the tester's name. Target is below 20 degrees C. If the reading exceeds 20 degrees C, treat as a FAIL: record the cause if known, the remedial action taken, and the date resolved. Source: HSG274 Part 2, Table 2.1.
4HOT WATER STORAGE CALORIFIER OR CYLINDER TEMPERATURE (Monthly): Record the date, vessel reference, the flow and return temperatures, and the tester's name. Storage temperature should be 60 degrees C or above; return temperature should reach at least 50 degrees C. Log any deviation as a FAIL with corrective action and sign-off. Source: HSG274 Part 2, Table 2.1; L8 ACoP 2013, paragraph 2.54.
5FLUSHING OF INFREQUENTLY USED OUTLETS (Weekly, for any outlet unused for seven days or more): Record the date, outlet ID, duration of flushing (run hot and cold for at least two minutes or until temperature stabilises), temperature achieved at the end of flushing, and the name of the person carrying out the task. Note whether the outlet is being decommissioned; if so, record that it has been capped and removed from the register. Source: HSG274 Part 2, paragraph 2.69.
6SHOWERHEAD AND FLEXIBLE HOSE CLEAN AND DESCALE (Quarterly as a minimum): Record the date, shower ID, the operative's name, and the method used (dismantle, descale, disinfect in accordance with your written scheme). Note the condition found (scale level, biofilm visible, debris) and the condition left. If the head or hose was replaced, record the new component. Sign the entry. Source: HSG274 Part 2, Table 2.1; HSG274 Part 2, paragraph 2.101.
7COLD WATER STORAGE TANK INSPECTION AND CLEAN (Annually as a minimum): Record the date of inspection, the operative's name and competency evidence or company reference, the condition of the tank (lid intact, insulated, no ingress of light, no visible contamination, inlet and outlet serviceable, float valve condition), whether the tank was cleaned and disinfected, and the date returned to service. Record any defects found and the corrective action with a target completion date. Source: HSG274 Part 2, Table 2.1; L8 ACoP 2013, paragraph 2.53.
8CALORIFIER INTERNAL INSPECTION (Annually where physically practicable): Record the date, vessel reference, the inspector's name, findings on scale build-up, sediment, condition of immersion heater and thermostat, and any pitting or corrosion noted. Record whether an acid descale was required, whether it was carried out, and the date returned to service. If access is not physically possible, record that fact and the alternative assessment method used. Source: HSG274 Part 2, Table 2.1.
9THERMOSTATIC MIXING VALVE (TMV) CHECK (Quarterly): Record the date, TMV location reference, the blend temperature achieved at the downstream outlet (typically set to 41 to 44 degrees C for a basin or 38 to 41 degrees C for a shower in line with the risk assessment), and the operative's name. Log any deviation from the set point, the adjustment or maintenance carried out, and the date re-checked and confirmed safe. Source: HSG274 Part 2, paragraph 2.97.
10REMEDIAL ACTIONS LOG (Ongoing, every time a FAIL or defect is recorded): For every corrective action arising from any check in this logbook, record a unique action reference, the date raised, a description of the problem, the person assigned, the target completion date, and the date actually completed with the outcome confirmed by a signature. No action entry should be left without a close-out date. Source: L8 ACoP 2013, paragraphs 2.83 to 2.85; HSE guidance 'Legionnaires disease: what you must do', record-keeping section.
11RESPONSIBLE PERSON AND TRAINING RECORD (Updated whenever personnel change or training is refreshed): Record the name and job title of the appointed Responsible Person for water safety, the date of their appointment, their training or qualification details, and the date of any refresher training. Where a competent contractor manages the system, record the company name, contract reference, and a contact name. This section confirms who is accountable at any point in time and is the first thing an HSE inspector will ask to see. Source: L8 ACoP 2013, paragraphs 2.4 to 2.8.
12RECORD RETENTION SIGN-OFF (Five-year rolling): Each completed logbook volume or digital archive must be labelled with the date range it covers, the premises name, and the name of the person responsible for its secure storage. Monitoring and inspection records must be retained for a minimum of five years. Significant findings of the risk assessment and the written scheme of control must be retained for as long as they remain current and for at least two years after they are superseded. Source: L8 ACoP 2013, paragraph 2.83; HSE 'Legionnaires disease: what you must do', keeping records.
Good to know
Under the L8 Approved Code of Practice, failure to keep adequate records does not need to cause a case of Legionnaires' disease to attract enforcement action: Section 33 of the Health and Safety at Work etc. Act 1974 allows the HSE to prosecute a duty holder simply for failing to comply with the ACoP, making the logbook itself a legal document rather than an optional management tool.
Source: Health and Safety at Work etc. Act 1974, section 2 and section 33; Control of Substances Hazardous to Health Regulations 2002 (SI 2002/2677), regulation 7; Management of Health and Safety at Work Regulations 1999 (SI 1999/3242), regulation 3; Approved Code of Practice L8 'Legionnaires disease: The control of legionella bacteria in water systems' (4th edition, 2013), paragraphs 2.4 to 2.8, 2.53 to 2.54, 2.83 to 2.85; HSG274 Part 2 'The control of legionella bacteria in hot and cold water systems' (2014), Table 2.1, paragraphs 2.69, 2.97, 2.101
Good to know
Questions, answered
What is the Legionella Water Monitoring Logbook?
This logbook is the duty holder's running proof that Legionella bacteria are being actively controlled in the building's water system, as required under the Health and Safety at Work etc. Act 1974, COSHH Regulations 2002, and the L8 Approved Code of Practice. Without it, an HSE inspector has no evidence that legal duties have been met, and a confirmed case of Legionnaires' disease on premises with no records can lead to prosecution, unlimited fines, and imprisonment for up to two years.
Why does it matter?
Under the L8 Approved Code of Practice, failure to keep adequate records does not need to cause a case of Legionnaires' disease to attract enforcement action: Section 33 of the Health and Safety at Work etc. Act 1974 allows the HSE to prosecute a duty holder simply for failing to comply with the ACoP, making the logbook itself a legal document rather than an optional management tool.
How do I get it, and is it up to date?
The PDF downloads the moment you check out, prints sharp in black and white, and opens on any phone. It is reviewed for August 2026 and you get any future update free when the official guidance changes.
A daily premises walk-round catches the failures that injure people and trigger enforcement before they hurt anyone: wedged fire doors, blocked escape routes, wet floors with no sign, and water outlets sitting unused long enough to breed legionella. It costs nothing and a new starter can do it. Missing these is what brings injuries, an Improvement or Prohibition Notice under the Fire Safety Order 2005, and prosecution under the Health and Safety at Work Act 1974.
Your temperature and flushing records are the main legal evidence that you are controlling Legionella, the bacteria that causes Legionnaires' disease (a pneumonia that can kill). Done properly, these records protect occupants and give you a defence if the HSE inspects; done as ticks with no readings, they are treated as no records at all and have led to UK prosecutions and six-figure fines.
This register is the written evidence that your portable electrical equipment is being maintained in a safe condition, as required by the Electricity at Work Regulations 1989 (Regulation 4) and PUWER 1998 (Regulations 5 and 6). Without it, a single electrical incident or HSE inspection can leave you unable to demonstrate compliance, exposing the duty holder to unlimited criminal liability under the Health and Safety at Work etc. Act 1974.
