WMSoc Training Courses - Legionella Control of Hot & Cold Water Systems - W204



1 CPD point awarded



This course is intended to give an overview of the alternatives available when control of legionella in hot and cold water systems used for ‘domestic’ purposes cannot be achieved by thermal means.   Expected participants will include owners, operators, service providers and legionella risk assessors of hot and cold systems.

Information on temperature control (the preferred control option) is not included in this module as it is covered fully in other WMS courses.   


To ensure delegates:

  • Gain an overview of options available when thermal control cannot be used, or is not completely effective
  • Understand the significance of relevant legislation and guidance
  • Understand the chemical options that are offered and how these are controlled
  • Recognise the physical control options, their advantages and limitations
  • Are introduced to some of the pre-treatment plant available to improve the quality of water used in these systems
  • Gain a sound foundation for further study



  • Legislation and guidance
  • Alternatives to thermal control
  • Chemical control options
  • Physical control options
  • Removal of suspended matter, hardness salts, iron and manganese



This module will help in attaining Water Management Society Qualifications and provides a useful pre-requisite for a number of courses.



W201 – Legionella Control & the Law (online course)

W202 – Legionellosis Causes and Impacts of Infection (online course)

W203 – An Appreciation of Hot & Cold Water Systems (online course)


This online course will give a foundation for the following classroom courses:

W257 – Cleaning & Disinfection of Hot & Cold Water Systems

W259 – Temperature Monitoring, Sampling & Inspection of Hot & Cold Water Systems for Technicians

W264 - Legionella Risk Assessment of Hot & Cold Water Systems Foundation

W265 – Practical Legionella Risk Assessment Hot & Cold Water Systems Advanced