Legionella Risk Assessment



What? Why? How? 

A Legionella risk assessment is a legal requirement for all businesses that expose the public or their employees to their water system, this includes private landlords. Legionella risk assessment is the starting point for all other Legionella control requirements and should only be conducted by competent people that are trained to do so. We have Legionella risk assessments tailored for landlords, commercial use buildings and industrial sites. We use a simple report layout with a traffic light system to make it easy for you to understand and use as a working document. You will also receive a Legionella control scheme with every risk assessment that details what controls are required and at what frequency. We then give you a template to document these controls following the appropriate Health & Safety Executive (HSE) guidance notes.

About Legionella

Legionella Bacteria is naturally found in water courses such as rivers, lochs, ponds and reservoirs but in low numbers. When this water is introduced into a man made water system, the bacteria could proliferate rapidly. Legionella is dormant in temperatures below 20oC and multiplies in temperatures between 20oC and 45oC. Legionella cannot survive in temperatures above 60oC. Legionella enters your body through your respiratory system through vapours or droplets of water and has a 10% mortality rate.

Water systems that store or recirculate water are at a higher risk. These may include cold water storage tanks where poor hygienic conditions can provide a nutrient source for the bacteria or hot water vessels with non-conforming temperatures allowing the bacteria to multiply then be released into the system. This may also include recreational water systems such as hot tubs or swimming pools where stored water is at a temperature which would allow Legionella to multiply. In this scenario, it’s essential that additional controls be implemented such as a biocide dosing regime to maintain compliance.

Commercial Water Tank (sectional potable water tank)   Calorifier Boiler - Heating Hot Water


Our assessors are experienced in all types of system and will perform:

  • Full assessment of all site assets with photographic evidence
  • Legionella control scheme documentation
  • Full system & outlet survey
  • Summary schematic of water system
  • Practical recommendations
  • Check of all legal and guideline requirements
  • Health & Safety Executive ACOP L8 & HSG 274 guidance
  • Coverage of HTM04-1 for Healthcare premises
  • Coverage of HTM01-05 for Dental premises
  • Alignment with BS8580

We can also help with remedial action plans that are tailored to your requirements.

We are a Scottish company, based in Perth but provide our services throughout Scotland. Our Perth office gives a central location to all major cities including Aberdeen, Inverness, Dundee, Stirling, Glasgow and Edinburgh.




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