{"id":31816,"date":"2025-12-12T15:04:28","date_gmt":"2025-12-12T15:04:28","guid":{"rendered":"https:\/\/www.trccompanies.com\/?post_type=news-and-insights&#038;p=31816"},"modified":"2026-02-27T20:11:23","modified_gmt":"2026-02-27T20:11:23","slug":"compliance-and-best-practices-for-legionella-risk-management-in-building-water-systems","status":"publish","type":"news-and-insights","link":"https:\/\/www.trccompanies.com\/fr\/insights\/compliance-and-best-practices-for-legionella-risk-management-in-building-water-systems\/","title":{"rendered":"Compliance and Best Practices for Legionella Risk Management in Building Water Systems"},"content":{"rendered":"<!-- Start Block: acf\/wysiwyg -->\n\n<section class=\"wysiwyg section-padding bg-white\">\n    <div class=\"container-fluid\">\n        \n        <div class=\"row\">\n                            <div class=\"col-lg-8 columns js-animated-content animated-content\">\n                                        <p><span data-contrast=\"auto\">A building\u2019s water system is its lifeblood &#8211; circulating through pipes, cooling towers and storage tanks every day. But hidden within that system can be an invisible threat: <\/span><i><span data-contrast=\"auto\">Legionella<\/span><\/i><span data-contrast=\"auto\"> bacteria. When water stagnates, sits at lukewarm temperatures, and\/or there is biofilm in the system, Legionella and other bacteria can multiply. Once aerosolized through showers, humidifiers, hot tubs, fountains, or HVAC system components, they can cause Legionnaires\u2019 disease \u2013 a serious and sometimes fatal respiratory infection.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">For building owners and facility managers, controlling Legionella bacteria and biofilm isn\u2019t just about ticking a compliance box. It\u2019s about protecting people, maintaining trust and ensuring operational resilience.<\/span><span data-ccp-props=\"{&quot;335559739&quot;:0}\">\u00a0<\/span><\/p>\n<h2>Understanding Legionella in Building Water Systems\u00a0<\/h2>\n<p><i><span data-contrast=\"auto\">Legionella<\/span><\/i><span data-contrast=\"auto\"> bacteria occur naturally in freshwater but can amplify in engineered water systems found in commercial, healthcare, institutional and residential buildings. Common high-risk systems include:<\/span><\/p>\n<ul>\n<li><span data-contrast=\"auto\">Cooling towers and evaporative condensers.<\/span><span data-ccp-props=\"{&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"auto\">Domestic hot and cold-water systems.<\/span><span data-ccp-props=\"{&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"auto\">Decorative fountains and spas.<\/span><span data-ccp-props=\"{&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"auto\">Humidifiers and misting systems.<\/span><span data-ccp-props=\"{&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"auto\">Structures with little to no occupancy and other unused pipe sections.<\/span><span data-ccp-props=\"{&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<\/ul>\n<p><span data-contrast=\"auto\">The bacteria actively grow between 77\u00b0F and 113\u00b0F (25\u00b0C\u201345\u00b0C), particularly in stagnant water with biofilm in the systems. Aging infrastructure, complex plumbing and low-flow systems often installed to save energy can unintentionally create ideal growth conditions, turning routine water systems into potential health risks.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<h2>Why Legionella Risk Management Is a Growing Priority<\/h2>\n<p><span data-contrast=\"auto\">Cases of Legionnaires\u2019 disease have increased globally over the past decade. According to the <\/span><a href=\"https:\/\/www.cdc.gov\/legionella\/php\/surveillance\/index.html\"><span data-contrast=\"none\">CDC<\/span><\/a><span data-contrast=\"auto\">, thousands of U.S. cases occur annually, of which many go undiagnosed or misattributed. Similar patterns are seen across Europe and Asia.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">Key factors driving this rise include:<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<ul>\n<li><span data-contrast=\"auto\">Aging building infrastructure and deferred maintenance.<\/span><span data-ccp-props=\"{&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"auto\">Rising ambient temperatures due to climate change.<\/span><span data-ccp-props=\"{&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"auto\">Periods of low occupancy or building downtime.\u00a0<\/span><span data-ccp-props=\"{&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"auto\">Inconsistent water temperature regulation in modern low-flow plumbing.<\/span><span data-ccp-props=\"{&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<\/ul>\n<p><span data-contrast=\"auto\">For facility leaders, these realities highlight one message: proactive Legionella management is critical for health, compliance and operational continuity.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<h2>Regulatory Landscape: Staying Ahead of Compliance Requirements\u00a0<\/h2>\n<p><span data-contrast=\"auto\">Legionella risk management is now a regulatory expectation across sectors from healthcare to hospitality to education. <\/span>\u00a0<br \/>\n\u00a0<br \/>\n<span data-contrast=\"auto\">Key frameworks include:<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<ul>\n<li><b><span data-contrast=\"auto\">ASHRAE Standard 188<\/span><\/b><span data-contrast=\"auto\">: Defines water management program requirements to reduce <\/span><a href=\"https:\/\/www.ashrae.org\/technical-resources\/bookstore\/ansi-ashrae-standard-188-2021-legionellosis-risk-management-for-building-water-systems\"><span data-contrast=\"none\">Legionellosis risk<\/span><\/a><span data-contrast=\"auto\"> in buildings.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"auto\">CDC Water Management Toolkit<\/span><\/b><span data-contrast=\"auto\">: Provides step-by-step guidance for developing a Water Management Plan (WMP).<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"auto\">CMS (Centers for Medicare &amp; Medicaid Services)<\/span><\/b><span data-contrast=\"auto\">: Requires healthcare facilities to actively control Legionella risk.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"auto\">HSE L8 (UK) and ISO 11731<\/span><\/b><span data-contrast=\"auto\">: Establish global standards for monitoring and testing.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<\/ul>\n<p><span data-contrast=\"auto\">Legionnaires disease outbreaks can result in public health incidents, reputational damage and costly remediation. Proper documentation, testing and ongoing validation are essential for demonstrating due diligence.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n                <\/div>\n                <div class=\"col-lg-4 columns js-animated-content animated-content\">\n                                        <div class=\"wysiwyg__links js-animated-content animated-content\">\n                        <div class=\"wysiwyg__links__top \">\n                                                        <h4>Related Services<\/h4>\n                                                                                    <ul class=\"js-animated-content animated-content\">\n                                                                <li><a href=\"https:\/\/www.trccompanies.com\/services\/environmental-health-safety-management\/safety-and-industrial-hygiene\/industrial-hygiene-assessments\/\" target=\"_self\">Industrial Hygiene Assessments<\/a><\/li>\n                                                                <li><a href=\"https:\/\/www.trccompanies.com\/services\/environmental-health-safety-management\/safety-and-industrial-hygiene\/\" target=\"_self\">Safety and Industrial Hygiene<\/a><\/li>\n                                                            <\/ul>\n                                                    <\/div>\n                                                                                                            <div class=\"wysiwyg__links__bottom\">\n                                    <a href=\"https:\/\/www.trccompanies.com\/services\" target=\"_self\">View All Services<\/a>\n                                <\/div>\n                                                                                                <\/div>\n                <\/div>\n                    <\/div>\n\n            <\/div>\n<\/section>\n<!-- End Block: acf\/wysiwyg -->\n\n<!-- Start Block: acf\/wysiwyg -->\n\n<section class=\"wysiwyg section-padding bg-white-fog\">\n    <div class=\"container-fluid\">\n                    <div class=\"wysiwyg__wrapper\">\n        \n        <div class=\"row\">\n                        <div class=\"col-lg-12\">\n                                                                                \n                                                <\/div>\n\n                            <div class=\"col-lg-12 js-animated-content animated-content\">\n                    <h2>Best Practices for Legionella Risk Management in Buildings\u00a0<\/h2>\n<p><span data-contrast=\"auto\">Effective Legionella prevention relies on a layered, evidence-based strategy that integrates engineering, maintenance and monitoring.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<ol>\n<li><b><span data-contrast=\"auto\">Temperature Control<\/span><\/b>\u00a0<br \/>\n<span data-contrast=\"auto\">Maintain hot water throughout the water systems above 120\u00b0F (49\u00b0C) and cold water below 77\u00b0F (25\u00b0C) to inhibit bacterial growth.\u00a0 Higher temperatures should be maintained in some system components, such as hot water holding tanks at 140F, if possible.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"auto\">System Design Optimization<\/span><\/b>\u00a0<br \/>\n<span data-contrast=\"auto\">Eliminate \u201cdead legs,\u201d low-use outlets and complex pipe loops where stagnant water can accumulate.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"auto\">Routine Flushing<\/span><\/b>\u00a0<br \/>\n<span data-contrast=\"auto\">Schedule systematic flushing to maintain water circulation and prevent stagnation.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"auto\">Disinfection and Treatment<\/span><\/b>\u00a0<br \/>\n<span data-contrast=\"auto\">Apply targeted treatments, including chlorine dioxide, copper-silver ionization, ultraviolet (UV) disinfection, or thermal eradication based on building type and system design.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"auto\">Maintenance<\/span><\/b>\u00a0<br \/>\n<span data-contrast=\"auto\">Promptly implement plumbing system repairs and ensure routine draining and disinfection of cooling towers to keep your systems in optimal operating condition while minimizing harbourage potential from conditions such as scale, silt, and biofilm accumulation.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"auto\">Continuous Monitoring and Data Analytics<\/span><\/b>\u00a0<br \/>\n<span data-contrast=\"auto\">Use smart sensors and IoT monitoring to track temperature, chlorine levels and flow conditions in real time for early detection.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<\/ol>\n<p><span data-contrast=\"auto\">Together, these measures form the backbone of a comprehensive Water Management Plan (WMP) \u2013 the gold standard for Legionella control and regulatory compliance.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n                <\/div>\n                                <\/div>\n\n                    <\/div>\n            <\/div>\n<\/section>\n<!-- End Block: acf\/wysiwyg -->\n\n<!-- Start Block: acf\/wysiwyg -->\n\n<section class=\"wysiwyg section-padding bg-white\">\n    <div class=\"container-fluid\">\n                    <div class=\"wysiwyg__wrapper\">\n        \n        <div class=\"row\">\n                        <div class=\"col-lg-12\">\n                                                                                \n                                                <\/div>\n\n                            <div class=\"col-lg-12 js-animated-content animated-content\">\n                    <h2>TRC\u2019s Approach: Comprehensive, Data-Driven Legionella Management\u00a0<\/h2>\n<p><span data-contrast=\"auto\">At TRC, we combine engineering expertise, industrial hygiene and environmental science to help clients stay ahead of Legionella risks. <\/span>\u00a0<br \/>\n\u00a0<br \/>\n<span data-contrast=\"auto\">Our Certified Industrial Hygienists (CIHs) and <\/span><a href=\"https:\/\/www.trccompanies.com\/services\/environmental-health-safety-management\/\"><span data-contrast=\"none\">Environmental Health &amp; Safety<\/span><\/a><span data-contrast=\"auto\"> (EHS) practitioners design customized Water Quality Management Plans (WQMPs) tailored to each facility\u2019s operational profile and regulatory needs.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">Our services include:<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<ul>\n<li><span data-contrast=\"auto\">Comprehensive Legionella testing and risk assessments.<\/span><span data-ccp-props=\"{&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"auto\">Development and implementation of custom WQMPs.<\/span><span data-ccp-props=\"{&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"auto\">System design reviews and remediation planning.<\/span><span data-ccp-props=\"{&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"auto\">Emergency response and outbreak mitigation support.<\/span><span data-ccp-props=\"{&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"auto\">Collaboration with CDC ELITE, NYS ELAP and A2LA-accredited laboratories for accurate, defensible testing results.<\/span><\/li>\n<\/ul>\n<p><span data-contrast=\"auto\">From commercial high-rises and healthcare facilities to campuses and government buildings, from potable water distribution to cooling tower basins, decorative fountains, and everything in between, TRC\u2019s integrated approach<\/span> <span data-contrast=\"auto\">ensures your water systems are safe, compliant and built for the future.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<h2>Building Safer, Healthier Spaces Through Collaboration\u00a0<\/h2>\n<p><span data-contrast=\"auto\">Legionella prevention is more than compliance, it\u2019s a shared commitment to health, sustainability and trust. Effective management requires collaboration among facility engineers, EHS teams, and public health professionals to build a strong water safety culture.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><span data-contrast=\"auto\">With TRC as your partner, you can go beyond checklists to create resilient, future-ready buildings that lead in safety, sustainability and operational confidence.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n                <\/div>\n                                <\/div>\n\n                    <\/div>\n            <\/div>\n<\/section>\n<!-- End Block: acf\/wysiwyg -->\n\n<!-- Start Block: acf\/innerpage-cta-bar -->\n<section class=\"global-cta innerpage-cta cta-purple\">\n    <div class=\"container-fluid\">\n        <div class=\"global-cta-wrapper  \">\n                                            <h2>Contact TRC Today<\/h2>\n                                <div class=\"global-cta-image\">\n                    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"316.566\" height=\"369\" viewBox=\"0 0 316.566 369\">\n                        <defs>\n                            <pattern id=\"pattern\" width=\"1\" height=\"1\" viewBox=\"117.006 0 316.566 369\">\n                                <image preserveAspectRatio=\"xMidYMid slice\" width=\"655.35\" height=\"369\" href=\"\/wp-content\/uploads\/2024\/08\/043b4c82-renewables.jpg\"><\/image>\n                            <\/pattern>\n                        <\/defs>\n                        <path id=\"Union_8\" data-name=\"Union 8\" d=\"M72.087,369,206.869,190.294h109.7L182.891,369ZM0,195.818H68.4l28.66,44.507L68.4,286.43Zm0-10.747L68.4,94.466l28.66,46.1L68.4,185.071Zm205.769-6.365L72.087,0h109.7L316.566,178.706Z\" fill=\"url(#pattern)\"\/>\n                    <\/svg>\n                <\/div>\n                <div class=\"global-cta-content\">\n                    <p>Strengthen your water safety program<\/p>\n                    <p>\n                        <a href=\"https:\/\/trccompanies.com\/contact-us\/\" title=\"Contact Us\" class=\"btn btn-primary\" target=\"_blank\" rel=\"noopener\">Contact Us<\/a>                    <\/p>\n                <\/div>\n                        \n        <\/div>\n    <\/div>\n<\/section>\n\n<!-- End Block: acf\/innerpage-cta-bar -->","protected":false},"excerpt":{"rendered":"<p>A building\u2019s water system is its lifeblood &#8211; circulating through pipes, cooling towers and storage tanks every day. But hidden within that system can be an invisible threat: Legionella bacteria.<\/p>\n","protected":false},"featured_media":31817,"template":"","tags":[1107,229],"news-and-insights-category":[363],"services-category":[1002,993],"custom_category":[1013],"class_list":["post-31816","news-and-insights","type-news-and-insights","status-publish","has-post-thumbnail","hentry","tag-ehs-assessments","tag-industrial-hygiene","news-and-insights-category-insights","services-category-environment-health-safety-and-sustainability","services-category-remediation-materials-management","custom_category-commercial-industrial-markets"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Legionella Risk Management in Building Water Systems | TRC<\/title>\n<meta name=\"description\" content=\"Protect your building from Legionella risks. Learn prevention, compliance, and water management best practices from TRC\u2019s practitioners.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.trccompanies.com\/fr\/insights\/compliance-and-best-practices-for-legionella-risk-management-in-building-water-systems\/\" \/>\n<meta property=\"og:locale\" content=\"fr_CA\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Legionella Risk Management in Building Water Systems | TRC\" \/>\n<meta property=\"og:description\" content=\"Protect your building from Legionella risks. 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