Hot and cold water systems within properties, particularly when vacant, have the potential to house millions of bacteria that can cause ill health in humans, and inadequate control of these systems can contribute to landlords and letting agents being liable to potential civil claims if not managed correctly.
According to the HSE ACoP L8 The Control of Legionella in Water Systems, the risk assessment should be reviewed annually and if there is reason to suspect that it is no longer valid, for example:
At EPC Northants our surveyors hold the city and guilds diploma in water hygiene, so you can be sure that your property is being assessed by a qualified surveyor.