The Public Health Act 2010 and the Public Health Regulation 2012 control various man made environments and systems which are conducive to the growth of Legionella organisms and which are capable, under the right conditions, of transmitting Legionnaires' disease.

These regulated systems include:

  • water cooling systems
  • hot water systems
  • warm water systems
  • air handling systems.



Policy directives

Water - Requirements for the Provision of cold and Heated Water - Policy Directive PD2015_008

Approved warm water systems including thermostatic mixing valves (TMVs)

Audit tools


Notification form

Notification form to notify the local council of the existence of a water cooling system or hospital warm water system

Legionnaires disease

Thermal power station main water cooling systems

Trigger Action Response Protocols (TARP) - July 2012

Page Updated: Friday 15 September 2017