So how often should a legionella risk assessment be carried out? At least every two years as a general rule, though many buildings need reviews far sooner.
A legionella risk assessment is a structured check of your water systems, covering the site survey, temperature checks, tank inspection and a full report.
The duty holder for Legionella risk in offices must appoint a competent person to assess, control and document the risk, as required under COSHH UK law.