Hot & Cold water systems​ - Legionella Risk Assessment

The Health & Safety Executive Approved Code of Practice (ACoP) L8:2013 “Control of Legionella Bacteria in Water Systems” and supplementary guidance publications: HSG 274 Parts 1-3 relate to all commercial, industrial and municipal properties which have water systems.

Within L8 there is a requirement to carry out assessments of the risk of proliferation of Legionella within Hot & cold, or domestic, water systems.
We have been providing assessments to premises ranging from let residential houses to hospital sites with 1000s of outlets for over 20 years, 
Our Risk Assessments cover:

  • Cold water storage cisterns (Tanks)
  • Centralised water heaters (Calorifiers)
  • Mains, Cold & hot distribution systems
  • Local water heaters (Point of use).
  • Showers and spray hoses.
  • Thermostatic Mixing Valves (TMV).
  • Booster sets and expansion vessels
  • Management and record keeping

We utilise guidance from ACoP L8, HSG274 Part 2, BS 8580-1:2019, WRAS water regs guidance, HTM 04-01 (Healthcare) and other relevant documents relating to the control of Legionella, in our assessment & subsequent recommendations.

Schematic diagrams are frequently not available or not suitable, we can provide a schematic drawing service ideally undertaken during the assessment or available as a stand alone service.

To obtain full benefit from a Legionella Risk Assessment it is important that our staff are assisted to access all parts of the system during our visit and that your site records, schematics and asbestos register are available.

Responsibility for compliance following the Risk Assessment remains with the Responsible Competent Person who needs to review it, implement recommendation and undertake routine preventative procedures. Risk Assessments should be reviewed regularly based on the inherent risk but they should also be updated if there are any significant system or other changes.

Fundamentally the objectives of our Legionella risk assessments are:

  1. To establish the current position regarding water service condition.
  2. To establish a record of plant data.
  3. To identify areas where modifications or adjustments may be required from a water quality and/or safety point of view.
  4. To establish a programme for compliance with HSG 274 the Control of Legionellosis including Legionnaires Disease.
Hot & Cold water systems​

Verification of Controls

We frequently find that systems which appear to be satisfactory and in accordance with HSG 274 can still have hygiene problems. It is for this reason that we strongly recommend bacterial [Total Viable Count (TVC) and Legionella] sampling to compliment the physical data obtained during the assessment.

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