{"id":275,"date":"2026-08-11T03:30:59","date_gmt":"2026-08-11T03:30:59","guid":{"rendered":"https:\/\/www.deltafirst.co.uk\/blog\/legionella-risk-assessment\/"},"modified":"2026-08-17T22:19:44","modified_gmt":"2026-08-17T22:19:44","slug":"legionella-risk-assessment","status":"publish","type":"post","link":"https:\/\/www.deltafirst.co.uk\/blog\/legionella-risk-assessment\/","title":{"rendered":"Legionella risk assessment for landlords and facilities managers"},"content":{"rendered":"<\/p>\n<p>If you are a UK landlord, employer, or anyone in control of premises with a water system, you are legally required to assess and manage the risk from legionella bacteria. That duty arises under the Health and Safety at Work etc. Act 1974 and the Control of Substances Hazardous to Health Regulations (COSHH). The immediate action is straightforward: appoint a named responsible person, determine whether a risk could reasonably occur, and commission a suitable and sufficient assessment if it can.<\/p>\n<p><strong>Your compliance checklist \u2014 minimum evidence to hold on file:<\/strong><\/p>\n<ul>\n<li>A written legionella risk assessment specific to your premises and water systems<\/li>\n<li>A named responsible person with the authority and knowledge to implement controls<\/li>\n<li>A written scheme of control (WSOC) where risk has been identified<\/li>\n<li>Temperature monitoring records and sentinel outlet logs<\/li>\n<li>A schematic diagram of the water system, updated when changes are made<\/li>\n<li>Records of any remedial actions taken and their completion dates<\/li>\n<\/ul>\n<p>If you are unsure whether your current assessment is adequate, or if you have never commissioned one, <a href=\"https:\/\/deltafirst.co.uk\" target=\"_blank\" rel=\"noopener\">contact Deltafirst<\/a> to arrange a site survey or planned maintenance quotation.<\/p>\n<hr>\n<h2 id=\"key-takeaways\">Key takeaways<\/h2>\n<p>A legionella risk assessment is a legal requirement for all UK dutyholders where a risk could reasonably occur, and the written scheme of control it produces is the foundation of every compliant water safety programme.<\/p>\n<table>\n<thead>\n<tr>\n<th>Point<\/th>\n<th>Details<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Legal duty applies broadly<\/td>\n<td>Landlords, employers, and those in control of premises all have a duty to assess and manage legionella risk under HSWA and COSHH.<\/td>\n<\/tr>\n<tr>\n<td>Temperature control is the primary measure<\/td>\n<td>Store hot water at \u226560\u00b0C, distribute to \u226550\u00b0C at outlets within one minute, and keep cold water below 20\u00b0C.<\/td>\n<\/tr>\n<tr>\n<td>Written records are mandatory<\/td>\n<td>Organisations with 5 or more employees must record the assessment in writing; all dutyholders should retain monitoring logs for at least five years.<\/td>\n<\/tr>\n<tr>\n<td>Review when the system or use changes<\/td>\n<td>There is no fixed annual deadline, but any system modification, change of occupancy, or control failure triggers an immediate review.<\/td>\n<\/tr>\n<tr>\n<td>Deltafirst delivers end-to-end compliance<\/td>\n<td>Site surveys, WSOC creation, PPM-integrated monitoring, and emergency support across Essex, Suffolk, Cambridgeshire, Norfolk, and Greater London.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><img decoding=\"async\" src=\"https:\/\/www.deltafirst.co.uk\/blog\/wp-content\/uploads\/2026\/08\/1786227658339_Key-takeaways-overview-diagram.jpeg\" alt=\"Key takeaways \u2014 overview diagram\"><\/p>\n<hr>\n<h2 id=\"table-of-contents\">Table of Contents<\/h2>\n<ul>\n<li><a href=\"#why-does-legionella-pose-a-serious-risk-to-building-occupants\">Why does legionella pose a serious risk to building occupants?<\/a><\/li>\n<li><a href=\"#which-uk-laws-and-standards-define-your-legal-duties\">Which UK laws and standards define your legal duties?<\/a><\/li>\n<li><a href=\"#what-does-a-suitable-and-sufficient-legionella-risk-assessment-actually-cover\">What does a suitable and sufficient legionella risk assessment actually cover?<\/a><\/li>\n<li><a href=\"#when-should-you-appoint-an-external-assessor-rather-than-doing-it-yourself\">When should you appoint an external assessor rather than doing it yourself?<\/a><\/li>\n<li><a href=\"#what-control-measures-and-monitoring-must-you-put-in-place-after-the-assessment\">What control measures and monitoring must you put in place after the assessment?<\/a><\/li>\n<li><a href=\"#how-often-should-you-review-the-assessment-and-what-records-must-you-keep\">How often should you review the assessment and what records must you keep?<\/a><\/li>\n<li><a href=\"#what-does-a-professional-assessment-look-like-in-practice\">What does a professional assessment look like in practice?<\/a><\/li>\n<li><a href=\"#why-legionella-assessments-belong-inside-your-ppm-programme-not-outside-it\">Why legionella assessments belong inside your PPM programme, not outside it<\/a><\/li>\n<li><a href=\"#deltafirst-legionella-risk-assessments-and-compliance-management-for-commercial-buildings\">Deltafirst: legionella risk assessments and compliance management for commercial buildings<\/a><\/li>\n<li><a href=\"#sources\">Sources<\/a><\/li>\n<\/ul>\n<h2 id=\"why-does-legionella-pose-a-serious-risk-to-building-occupants\">Why does legionella pose a serious risk to building occupants?<\/h2>\n<p>Legionella pneumophila is a bacterium that thrives in water systems held between 20\u00b0C and 45\u00b0C. When contaminated water is dispersed as fine aerosol droplets \u2014 through showers, cooling towers, spa pools, or humidifiers \u2014 those droplets can be inhaled, causing Legionnaires\u2019 disease: a severe form of pneumonia that carries a significant fatality rate, particularly in older adults, smokers, and immunocompromised individuals.<\/p>\n<p>The building systems most commonly implicated are hot and cold water services, cooling towers, evaporative condensers, and spa pools. Dead legs in pipework, infrequently used outlets, scale, and biofilm all create conditions where the bacterium can multiply rapidly. Facilities managers overseeing large or complex sites should treat any stagnant water zone as a potential hazard until the assessment says otherwise.<\/p>\n<blockquote>\n<p><strong>Health risk:<\/strong> Legionnaires\u2019 disease is a notifiable disease under RIDDOR. An outbreak linked to a building system can trigger an HSE investigation, enforcement action, and prosecution of the dutyholder. The reputational and legal consequences of a failure are severe \u2014 and entirely preventable with a properly managed water safety programme.<\/p>\n<\/blockquote>\n<hr>\n<h2 id=\"which-uk-laws-and-standards-define-your-legal-duties\">Which UK laws and standards define your legal duties?<\/h2>\n<p>The legal framework for legionella control in the UK sits across several instruments, all of which a dutyholder needs to understand.<\/p>\n<p><strong>Primary legislation:<\/strong><\/p>\n<ul>\n<li><strong>Health and Safety at Work etc. Act 1974 (HSWA):<\/strong> Places a general duty on employers and those in control of premises to protect employees and others from risks to health, including waterborne pathogens.<\/li>\n<li><strong>Management of Health and Safety at Work Regulations 1999:<\/strong> Requires a suitable and sufficient risk assessment for all significant workplace hazards.<\/li>\n<li><strong>Control of Substances Hazardous to Health Regulations 2002 (COSHH):<\/strong> Legionella is a biological agent under COSHH; dutyholders must assess and control exposure.<\/li>\n<\/ul>\n<p><strong>Authoritative guidance and standards:<\/strong><\/p>\n<ul>\n<li><strong><a href=\"https:\/\/www.hse.gov.uk\/pubns\/books\/l8.htm\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">ACoP L8<\/a> (Legionnaires\u2019 disease: The control of legionella bacteria in water systems):<\/strong> The Approved Code of Practice with quasi-legal status. Failure to follow it is not automatically an offence, but a dutyholder who cannot demonstrate an equivalent standard of control is likely to be found in breach of the underlying legislation.<\/li>\n<li><strong><a href=\"https:\/\/www.hse.gov.uk\/PUBNS\/priced\/hsg274part2.pdf\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">HSG274 Part 2<\/a>:<\/strong> Technical guidance for hot and cold water systems, covering schematics, monitoring, cleaning, disinfection, and when sampling may be appropriate.<\/li>\n<li><strong>BS 8580-1:2019:<\/strong> The British Standard for water quality risk assessments for Legionella control, setting out the methodology and competence requirements for assessors.<\/li>\n<li><strong>RIDDOR:<\/strong> Legionnaires\u2019 disease contracted through work is reportable; employers must notify the HSE if an employee is diagnosed.<\/li>\n<\/ul>\n<p><strong>Who is the dutyholder?<\/strong><\/p>\n<p>The dutyholder is whoever has control of the premises or the water system within it. In practice, that means:<\/p>\n<ul>\n<li>Employers (for any workplace with a water system)<\/li>\n<li>Commercial landlords and managing agents<\/li>\n<li>Residential landlords (including buy-to-let and HMO operators)<\/li>\n<li>Facilities managers acting under a management contract<\/li>\n<li>Local authorities and NHS estates teams<\/li>\n<\/ul>\n<p>Where 5 or more employees are employed, the risk assessment and control scheme must be recorded in writing. For smaller organisations, written records remain strongly advisable and are expected by enforcement bodies.<\/p>\n<hr>\n<h2 id=\"what-does-a-suitable-and-sufficient-legionella-risk-assessment-actually-cover\">What does a suitable and sufficient legionella risk assessment actually cover?<\/h2>\n<p><a href=\"https:\/\/www.hse.gov.uk\/pubns\/books\/l8.htm\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">ACoP L8<\/a> describes the dutyholder\u2019s core obligations: identify and assess risks, prepare a written scheme where appropriate, implement and monitor precautions, keep records, and appoint a competent responsible person. A report that meets that standard is not a generic template \u2014 it is a site-specific document built from a physical survey.<\/p>\n<h3 id=\"the-site-survey\">The site survey<\/h3>\n<p>The assessor walks the full water system: cold water storage tanks, calorifiers, hot water cylinders, distribution pipework, sentinel outlets, showers, taps, cooling towers, and any aerosol-generating plant. Dead legs, infrequently used outlets, and poorly insulated pipework are identified and recorded. The survey produces an asset register and a schematic diagram of the system \u2014 a requirement under both ACoP L8 and HSG274 Part 2, and one of the most common omissions in poor-quality assessments.<\/p>\n<h3 id=\"temperature-checks\">Temperature checks<\/h3>\n<p>Temperature control is the primary strategy for managing legionella risk in most hot and cold water systems. The key targets are:<\/p>\n<p>Sentinel outlet temperatures \u2014 the first and last outlets on each circuit \u2014 are measured and recorded during the survey as evidence that the system is operating within control parameters.<\/p>\n<h3 id=\"the-written-scheme-of-control-wsoc\">The written scheme of control (WSOC)<\/h3>\n<p>The WSOC is the operational document that translates the risk assessment into day-to-day management. Under ACoP L8, it must specify:<\/p>\n<ul>\n<li>Named responsibilities for each monitoring and maintenance task<\/li>\n<li>Monitoring locations, frequencies, and acceptable parameter ranges<\/li>\n<li>Cleaning and disinfection procedures and their intervals<\/li>\n<li>Remedial actions to take when parameters are breached<\/li>\n<li>Safe operating procedures for each controlled system<\/li>\n<\/ul>\n<p>A credible assessment report also includes: dated photographic evidence, measured temperature readings at sentinel outlets, a prioritised action list with risk ratings, and the name and competence details of the assessor.<\/p>\n<hr>\n<h2 id=\"when-should-you-appoint-an-external-assessor-rather-than-doing-it-yourself\">When should you appoint an external assessor rather than doing it yourself?<\/h2>\n<p>HSE guidance for landlords confirms that for most domestic properties \u2014 a single-let house or flat with a conventional hot and cold water system \u2014 a simple, proportionate assessment will be sufficient, and the landlord may carry it out themselves if they have the competence to do so. The law does not require a specialist contractor for every property.<\/p>\n<p>That said, the circumstances that require an external, competent assessor are clear:<\/p>\n<ol>\n<li><strong>Complex water systems:<\/strong> multiple storage vessels, recirculating hot water circuits, cooling towers, or evaporative condensers.<\/li>\n<li><strong>High-risk occupants:<\/strong> healthcare premises, care homes, schools, hotels, and any site where vulnerable people are present.<\/li>\n<li><strong>Commercial premises:<\/strong> offices, industrial sites, retail units, and public sector buildings where employer duties under HSWA apply in full.<\/li>\n<li><strong>Multiple dutyholders:<\/strong> shared buildings, multi-tenanted commercial properties, or sites where management responsibilities are divided.<\/li>\n<li><strong>Previous control failures:<\/strong> a temperature breach, a positive microbiological result, or a system that has been shut down for an extended period.<\/li>\n<\/ol>\n<h3 id=\"what-competence-should-your-assessor-demonstrate\">What competence should your assessor demonstrate?<\/h3>\n<p>Competence under ACoP L8 is a combination of training, practical experience, and continued professional development \u2014 not a single certificate. When selecting an assessor, look for:<\/p>\n<ul>\n<li>Relevant formal training (City &amp; Guilds 6150 or equivalent legionella qualification)<\/li>\n<li>Demonstrable experience with premises of similar type and complexity<\/li>\n<li>Familiarity with ACoP L8, HSG274, and BS 8580-1:2019<\/li>\n<li>Legionella Control Association (LCA) membership as a quality signal<\/li>\n<li>Adequate professional indemnity and public liability insurance<\/li>\n<\/ul>\n<p><strong>Pro Tip:<\/strong> <em>Ask any prospective assessor for a sample report from a comparable site before appointing them. A strong sample report will include a site-specific schematic, photographic evidence, measured temperatures, and a prioritised action list \u2014 not a generic checklist. If the sample looks templated, the live report probably will be too.<\/em><\/p>\n<h3 id=\"realistic-timescales-and-cost\">Realistic timescales and cost<\/h3>\n<p>Assessment duration scales with system complexity. Smaller properties may only take a brief site visit; larger commercial buildings with complex systems require multiple hours on site. Report delivery typically follows within 5\u201310 working days of the site visit, with a follow-up discussion to agree the WSOC and action priorities.<\/p>\n<p>Cost varies with site size, system complexity, and the scope of the written scheme. A straightforward domestic assessment sits at the lower end of the market; a full commercial assessment covering multiple systems, a WSOC, and a monitoring schedule represents a more substantial investment. The relevant question is not the upfront fee but whether the report will withstand scrutiny from an HSE inspector \u2014 a templated report that omits schematics or photographic evidence is not a saving.<\/p>\n<hr>\n<h2 id=\"what-control-measures-and-monitoring-must-you-put-in-place-after-the-assessment\">What control measures and monitoring must you put in place after the assessment?<\/h2>\n<p>The assessment identifies the hazards; the WSOC and ongoing monitoring are what actually keep occupants safe. The responsible person must implement and maintain the following:<\/p>\n<h3 id=\"temperature-control-regime\">Temperature control regime<\/h3>\n<p>Hot water must be stored at 60\u00b0C and distributed so that outlets reach 50\u00b0C (55\u00b0C in healthcare settings) within one minute. Cold water must be kept below 20\u00b0C throughout the system. Where these targets cannot be met by design alone, supplementary controls such as water treatment, UV disinfection, or chemical dosing may be required.<\/p>\n<p>Flushing policies matter as much as storage temperatures. Outlets that are used infrequently \u2014 a guest bathroom, a seasonal facility, a building that has been closed \u2014 must be flushed regularly to prevent stagnation. The WSOC should specify flushing frequencies for all low-use outlets.<\/p>\n<h3 id=\"engineering-controls-and-maintenance\">Engineering controls and maintenance<\/h3>\n<ul>\n<li>Remove or cap dead legs identified during the survey<\/li>\n<li>Insulate cold water pipework to prevent heat gain from adjacent hot services<\/li>\n<li>Fit lids to cold water storage tanks and inspect them regularly<\/li>\n<li>Install thermostatic mixing valves (TMVs) in healthcare and care settings where scalding risk must be balanced against temperature control<\/li>\n<li>Design out aerosol-generating risk where possible during refurbishment<\/li>\n<\/ul>\n<h3 id=\"monitoring-checklist\">Monitoring checklist<\/h3>\n<p>Regular monitoring is the evidence that the system remains under control. The responsible person should maintain logs covering:<\/p>\n<ul>\n<li><strong>Daily\/weekly:<\/strong> visual checks on plant condition, any unusual odours or discolouration<\/li>\n<li><strong>Monthly:<\/strong> sentinel outlet temperature checks at first and last outlets on each circuit<\/li>\n<li><strong>Quarterly:<\/strong> full temperature survey of representative outlets, inspection of storage tanks, check of TMV performance<\/li>\n<li><strong>Annually (minimum):<\/strong> full system review against the WSOC, inspection of calorifiers and cold water tanks, review of the risk assessment<\/li>\n<\/ul>\n<p>Escalation triggers requiring immediate action include: a temperature reading outside control parameters, a system modification or extension, a prolonged shutdown, or a positive microbiological result where sampling has been undertaken.<\/p>\n<h3 id=\"when-is-microbiological-testing-needed\">When is microbiological testing needed?<\/h3>\n<p>HSE\u2019s INDG458 leaflet is clear: microbiological testing is only appropriate in specific circumstances and must not replace regular inspection and temperature monitoring. For most domestic hot and cold water systems, temperature monitoring and inspection are sufficient. Testing is appropriate only in specific circumstances such as suspected outbreaks, repeated temperature control failures, or when a risk assessment identifies it as necessary for complex systems. There is no HSE requirement for a \u201clegionella test certificate\u201d for residential landlords.<\/p>\n<hr>\n<h2 id=\"how-often-should-you-review-the-assessment-and-what-records-must-you-keep\">How often should you review the assessment and what records must you keep?<\/h2>\n<p>There is no fixed annual deadline in UK law for reviewing a legionella risk assessment. What the guidance requires is that the assessment remains current and reflects the actual state of the system. A review is triggered by any of the following:<\/p>\n<ul>\n<li>A change to the water system (new pipework, new plant, altered use of outlets)<\/li>\n<li>A change in the use or occupancy of the building<\/li>\n<li>A change in the population of users (for example, a building converting to a care home)<\/li>\n<li>A suspected or confirmed case of Legionnaires\u2019 disease linked to the premises<\/li>\n<li>A prolonged shutdown followed by recommissioning<\/li>\n<li>Evidence that existing controls are failing (temperature breaches, positive microbiology)<\/li>\n<\/ul>\n<p>In the absence of any of these triggers, a periodic review \u2014 typically every two years for a stable system, or annually for higher-risk premises \u2014 is consistent with good practice under ACoP L8.<\/p>\n<p><strong>Record-keeping requirements:<\/strong><\/p>\n<ul>\n<li>The written risk assessment and WSOC must be retained and available for inspection<\/li>\n<li>Temperature monitoring logs, inspection records, and sampling results should be kept for a minimum of five years<\/li>\n<li>Records of cleaning, disinfection, and remedial actions should be retained for the same period<\/li>\n<li>Where 5 or more employees are employed, the recording duty is statutory<\/li>\n<\/ul>\n<p><strong>Pro Tip:<\/strong> <em>Link your legionella review to other statutory visits \u2014 gas safety inspections, electrical condition reports, or planned maintenance visits. For occupied residential properties, this approach reduces the number of access requests and makes it easier to schedule the work without disrupting tenants.<\/em><\/p>\n<p>Integrating water hygiene records into your broader <a href=\"https:\/\/deltafirst.co.uk\/blog\/water-compliance-services\" target=\"_blank\" rel=\"noopener\">water compliance services<\/a> framework also simplifies audit preparation and gives a single point of reference for enforcement bodies.<\/p>\n<hr>\n<p><img decoding=\"async\" src=\"https:\/\/www.deltafirst.co.uk\/blog\/wp-content\/uploads\/2026\/08\/1786227605149_How-often-should-you-review-the-assessment-and-what-records-must-you-keep-overview-diagram.jpeg\" alt=\"How often should you review the assessment and what records must you keep? \u2014 overview diagram\"><\/p>\n<h2 id=\"what-does-a-professional-assessment-look-like-in-practice\">What does a professional assessment look like in practice?<\/h2>\n<p>Deltafirst follows a structured methodology on every site, designed to produce a report that is defensible under ACoP L8 and immediately actionable for the responsible person.<\/p>\n<h3 id=\"step-by-step-process\">Step-by-step process<\/h3>\n<p><strong>1. Scoping and pre-visit review:<\/strong> Review of existing documentation, previous assessments, and system drawings where available. This avoids duplication and focuses survey time on gaps and changes.<\/p>\n<p><strong>2. Site survey:<\/strong> Full walkthrough of all water-using plant and distribution pipework. Asset register updated or created. Dead legs, low-use outlets, and poorly performing zones identified and photographed.<\/p>\n<p><strong>3. Sentinel temperature checks:<\/strong> Measured temperatures recorded at first and last outlets on each circuit, at storage vessels, and at calorifiers. All readings dated and logged against the system schematic.<\/p>\n<p><strong>4. Photographic evidence:<\/strong> Condition photographs of storage tanks, calorifiers, TMVs, tank lids, insulation, and any identified defects. Photographs are referenced in the report and form part of the audit trail.<\/p>\n<p><strong>5. Schematic update:<\/strong> The system schematic is updated to reflect current configuration, including any modifications since the last assessment.<\/p>\n<p><strong>6. Written scheme of control:<\/strong> A site-specific WSOC is produced, specifying monitoring locations, frequencies, responsibilities, and remedial action thresholds.<\/p>\n<h3 id=\"typical-process-timeline\">Typical process timeline<\/h3>\n<table>\n<thead>\n<tr>\n<th>Stage<\/th>\n<th>Typical duration<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Site visit (small to medium commercial)<\/td>\n<td>2\u20134 hours<\/td>\n<\/tr>\n<tr>\n<td>Site visit (large or complex site)<\/td>\n<td>typically several hours to a full day<\/td>\n<\/tr>\n<tr>\n<td>Report and WSOC delivery<\/td>\n<td>usually within a week or two after the visit<\/td>\n<\/tr>\n<tr>\n<td>Follow-up review meeting<\/td>\n<td>1 hour (remote or on site)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Integrating the assessment into a <a href=\"https:\/\/deltafirst.co.uk\/blog\/hvac-maintenance-plan\" target=\"_blank\" rel=\"noopener\">planned preventative maintenance<\/a> schedule means temperature checks, flushing records, and annual reviews are built into the service contract rather than managed as separate ad hoc tasks.<\/p>\n<p><strong>Pro Tip:<\/strong> <em>Request that your assessor names a specific competent contact on the report \u2014 not just a company name. The responsible person needs to know who to call when a temperature breach occurs at 07:00 on a Monday morning.<\/em><\/p>\n<hr>\n<h2 id=\"why-legionella-assessments-belong-inside-your-ppm-programme-not-outside-it\">Why legionella assessments belong inside your PPM programme, not outside it<\/h2>\n<p>The facilities teams that manage legionella risk most effectively are not the ones that commission an assessment every two years and file it away. They are the ones that treat the assessment as the opening document in a long-term maintenance relationship.<\/p>\n<p>A one-off assessment tells you the state of the system on the day of the survey. A PPM-integrated programme tells you whether the system is drifting toward a control failure before it gets there. Temperature logs, flushing records, and annual schematic reviews are not administrative overhead \u2014 they are the evidence that protects the dutyholder when an enforcement body asks for it.<\/p>\n<p>The responsible person role is frequently misunderstood. Appointing someone to the role without giving them the tools, the training, and the ongoing support to fulfil it creates a compliance gap that a report alone cannot close. Deltafirst\u2019s approach is to hand over a WSOC that the responsible person can actually use, with clear monitoring schedules and named escalation contacts, rather than a document that sits in a drawer.<\/p>\n<hr>\n<h2 id=\"deltafirst-legionella-risk-assessments-and-compliance-management-for-commercial-buildings\">Deltafirst: legionella risk assessments and compliance management for commercial buildings<\/h2>\n<p>Deltafirst delivers <a href=\"https:\/\/deltafirst.co.uk\/why\/full-compliance-management.html\" target=\"_blank\" rel=\"noopener\">full compliance management<\/a> for commercial, industrial, education, healthcare, retail, and public sector clients across Essex, Suffolk, Cambridgeshire, Norfolk, and Greater London. Our water hygiene services cover site surveys, written schemes of control, monitored PPM packages, temperature logging, and emergency call-outs \u2014 all delivered by qualified engineers with the competence and insurance cover that ACoP L8 requires.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.deltafirst.co.uk\/blog\/wp-content\/uploads\/2026\/07\/1783116648075_deltafirst.jpg\" alt=\"Deltafirst\"><\/p>\n<p>Whether you need a first-time assessment for a newly acquired property, a review of an existing report that no longer reflects your system, or an ongoing compliance contract that takes the management burden off your estates team, Deltafirst provides a single accountable point of contact. We serve facilities managers, property owners, NHS trusts, local authorities, schools, hotels, and retail operators who need compliance delivered reliably and on time.<\/p>\n<p>Request a quotation or planned maintenance survey from Deltafirst today \u2014 and have a compliant, site-specific water safety programme in place without delay.<\/p>\n<hr>\n<h2 id=\"sources\">Sources<\/h2>\n<p>The primary reference for all UK legionella compliance is <strong>ACoP L8<\/strong>, which sets out dutyholder responsibilities, the requirements for a written scheme of control, and the competence expected of the responsible person. It applies to all premises types.<\/p>\n<p><strong>HSG274 Part 2<\/strong> provides the technical detail behind ACoP L8 for hot and cold water systems specifically: schematic requirements, monitoring regimes, cleaning and disinfection procedures, and guidance on when microbiological sampling is appropriate. It is the document a competent assessor should be working from on a commercial site.<\/p>\n<p><strong>BS 8580-1:2019<\/strong> sets the methodology and competence standards for risk assessors and is the benchmark against which assessment quality is measured.<\/p>\n<p>For residential landlords, the <strong>HSE landlords\u2019 guidance<\/strong> explains the proportionate approach that applies to domestic properties. The <strong>HSE INDG458 leaflet<\/strong> is a concise summary of control principles and clarifies when microbiological testing is and is not required. The <strong>HSE hot and cold water page<\/strong> gives the definitive temperature targets referenced throughout this guide.<\/p>\n<p>This article is general information, not a substitute for advice from a qualified doctor. Consult a qualified healthcare professional about your own circumstances before acting on anything here.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.hse.gov.uk\/pubns\/books\/l8.htm\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">Legionnaires\u2019 disease: The control of legionella bacteria in water systems. Approved Code of Practice and guidance on regulations L8<\/a><\/li>\n<li><a href=\"https:\/\/www.hse.gov.uk\/PUBNS\/priced\/hsg274part2.pdf\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">HSG274 &#8211; Legionnaires\u2019 disease &#8211; Technical guidance &#8211; Part 2<\/a><\/li>\n<\/ul>\n<h2 id=\"recommended\">Recommended<\/h2>\n<ul>\n<li><a href=\"https:\/\/deltafirst.co.uk\/blog\/summer-hvac-maintenance\" target=\"_blank\" rel=\"noopener\">Summer HVAC maintenance: a guide for facilities managers<\/a><\/li>\n<li><a href=\"https:\/\/deltafirst.co.uk\/blog\/air-conditioning-consulting\" target=\"_blank\" rel=\"noopener\">Air conditioning consulting for facilities managers: UK guide<\/a><\/li>\n<li><a href=\"https:\/\/deltafirst.co.uk\/blog\/facilities-management-for-hospitals-5-providers\" target=\"_blank\" rel=\"noopener\">Top 5 Facilities Management Providers for Hospitals 2026 \u2013 Commercial Building Services Insights<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Ensure your premises are safe with a thorough legionella risk assessment. Discover essential steps for compliance and protection today.<\/p>\n","protected":false},"author":2,"featured_media":276,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","footnotes":""},"categories":[13],"tags":[527,54,37,117,513,525,524,23,522,521,177,526,516,22,523,348],"class_list":["post-275","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-facilities-management","tag-building-safety","tag-compliance","tag-facilities-management","tag-facilities-managers","tag-health-and-safety","tag-hot-and-cold-water-systems","tag-landlords","tag-legionella-control","tag-legionella-management","tag-legionella-risk-assessment","tag-preventive-maintenance","tag-risk-management","tag-uk-regulations","tag-water-hygiene","tag-water-safety","tag-water-systems"],"blocksy_meta":[],"uagb_featured_image_src":{"full":["https:\/\/www.deltafirst.co.uk\/blog\/wp-content\/uploads\/2026\/08\/1786227357121_Engineer-measuring-water-pipe-temperature.jpeg",1260,720,false],"thumbnail":["https:\/\/www.deltafirst.co.uk\/blog\/wp-content\/uploads\/2026\/08\/1786227357121_Engineer-measuring-water-pipe-temperature-150x150.jpeg",150,150,true],"medium":["https:\/\/www.deltafirst.co.uk\/blog\/wp-content\/uploads\/2026\/08\/1786227357121_Engineer-measuring-water-pipe-temperature-300x171.jpeg",300,171,true],"medium_large":["https:\/\/www.deltafirst.co.uk\/blog\/wp-content\/uploads\/2026\/08\/1786227357121_Engineer-measuring-water-pipe-temperature-768x439.jpeg",768,439,true],"large":["https:\/\/www.deltafirst.co.uk\/blog\/wp-content\/uploads\/2026\/08\/1786227357121_Engineer-measuring-water-pipe-temperature-1024x585.jpeg",1024,585,true],"1536x1536":["https:\/\/www.deltafirst.co.uk\/blog\/wp-content\/uploads\/2026\/08\/1786227357121_Engineer-measuring-water-pipe-temperature.jpeg",1260,720,false],"2048x2048":["https:\/\/www.deltafirst.co.uk\/blog\/wp-content\/uploads\/2026\/08\/1786227357121_Engineer-measuring-water-pipe-temperature.jpeg",1260,720,false]},"uagb_author_info":{"display_name":"Delta First Editorial Team","author_link":"https:\/\/www.deltafirst.co.uk\/blog\/author\/deltaeditor\/"},"uagb_comment_info":0,"uagb_excerpt":"Ensure your premises are safe with a thorough legionella risk assessment. Discover essential steps for compliance and protection today.","_links":{"self":[{"href":"https:\/\/www.deltafirst.co.uk\/blog\/wp-json\/wp\/v2\/posts\/275","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.deltafirst.co.uk\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.deltafirst.co.uk\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.deltafirst.co.uk\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.deltafirst.co.uk\/blog\/wp-json\/wp\/v2\/comments?post=275"}],"version-history":[{"count":1,"href":"https:\/\/www.deltafirst.co.uk\/blog\/wp-json\/wp\/v2\/posts\/275\/revisions"}],"predecessor-version":[{"id":279,"href":"https:\/\/www.deltafirst.co.uk\/blog\/wp-json\/wp\/v2\/posts\/275\/revisions\/279"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.deltafirst.co.uk\/blog\/wp-json\/wp\/v2\/media\/276"}],"wp:attachment":[{"href":"https:\/\/www.deltafirst.co.uk\/blog\/wp-json\/wp\/v2\/media?parent=275"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.deltafirst.co.uk\/blog\/wp-json\/wp\/v2\/categories?post=275"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.deltafirst.co.uk\/blog\/wp-json\/wp\/v2\/tags?post=275"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}