SafetyCulture Summit 2020

Legionella Risk Assessment Templates

Easily identify and control risk factors and keep your facility safe and disease-free.

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Published October 6th, 2020

What is Legionella Risk Assessment?

Legionella Risk Assessment is a tool used to identify risk factors in a facility and determine interventions for controlling risks of Legionnaires’ disease, a pneumonia-like illness caused by the waterborne pathogen, Legionella. Assessing and mitigating Legionella-related risks is a legal requirement for employers, especially for hotel operators, hospital administrators, and landlords.

Why use Legionella Risk Assessment Templates?

Property managers or competent individuals responsible for the control of Legionella bacteria should ensure a safe and disease-free workplace or residential accommodation for occupants. Legionella risk assessment templates aim to guide assessors perform thorough inspections of water systems and prevent the growth of Legionella bacteria which can cause serious harm or fatality from Legionnaires’ disease.

This article features: 1) what makes a facility more exposed to legionnaires’ disease and how to control risks associated with legionella in building water systems; 2) temperature sensors for 24/7 remote monitoring and real-time alerts to the right people when something goes wrong; and 3) free legionella risk assessment templates you can download, customize, and use.

In Michigan, Flint’s water crisis spawned one of the largest outbreaks of Legionnaires’ disease in U.S. history. Here are the most common factors that make a facility more susceptible to Legionella bacteria and how property managers can effectively control them:

  1. Redundant Piping or Dead Legs

    Dead legs are improperly removed or rarely used outlet pipes without regular water flow, and such redundancy in pipeline systems lead to stagnant water, a primary breeding ground for Legionella. For example, if a sink has been removed and the piping that once lead to it has been capped off, this creates an area for water to stagnate. Easily manage redundant pipework by surveying the hot and cold water system and updating its full schematic diagram, including the water flow, water treatment program, and a written scheme for controlling Legionella.

  2. Infected Cold Water Storage Tanks

    Another condition for legionella to rapidly multiply is the lack of residual disinfectants like chlorine in cold water storage tanks. Routine cleaning and disinfection of cooling towers and the hot and cold water system should take place at least once in every six months. The procedure should cover the initial concentration of oxidizing biocide in use for the pre- and post-cleaning disinfection stages, contact time for each stage, and methods for carrying out the cleaning, including the removal of packing.

  3. Lukewarm Water Temperature

    The temperature of hot and cold tap water should remain 50 degrees Celsius (122°F) or above and 20 degrees Celsius (68°F) or below, respectively, while the water temperature inside the boiler should be kept at or above 60 degrees Celsius (140°F). Legionella exponentially grows in warm water temperatures, ranging from 25-42 degrees Celsius (77°-108°F). Proactively guard the premises against Legionnaires’ disease by installing temperature sensors.

Automate Temperature Readings and Gain Real-time Alerts

Property managers can effectively prevent Legionellosis in their premises by regularly maintaining the condition, cleanliness, and correct temperature of hot and cold water systems. Turn your paper forms into digitized templates and record significant data with the convenience of using iAuditor, the world’s most powerful inspection mobile app.

  • Capture photo evidence of hazards detected such as untidy cooling towers, damaged water storage tanks, and unmaintained water temperatures.
  • Auto-save Legionella risk assessment data and secure unlimited reports in iAuditor’s cloud-based storage anytime, anywhere.
  • 24/7 remote monitoring and triggered alerts to the right people when the temperature goes out of a safe range with Sensors by SafetyCulture.


Shine Colcol

SafetyCulture Staff Writer

Shine has been professionally writing about virtually anything since her internship for a digital publisher of niche blogazines. She is passionate about building a culture of continuous improvement in the environmental, health, safety, and quality space through well-researched, engaging, and impactful content.