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Legionella risk assessment and water hygiene in a London commercial building

Commercial · Water Hygiene

Legionella risk assessments.

A standing duty on every employer, landlord and person in control of premises, under the Health and Safety at Work Act and ACOP L8. It takes a couple of hours and almost nobody in London markets it.

What we do

A duty most people do not know they have.

The duty

The Health and Safety at Work etc. Act 1974 and the Control of Substances Hazardous to Health Regulations require you to assess and control the risk from legionella. ACOP L8 is the approved code of practice that sets out how.

Who it applies to

Employers, the person in control of premises, and landlords. It applies to residential lettings as well as commercial buildings, which surprises most landlords.

The assessment

We survey the water system, identify where water stagnates or sits in the risk temperature range, and produce a written assessment with a schedule of controls.

Temperature monitoring

Monthly checks at sentinel outlets, recorded. This is the ongoing control and the part that gets forgotten between assessments.

Tank inspection

Cold water storage tank inspected for debris, insects, temperature and lid condition. Tanks are where most problems actually start.

Cleaning and disinfection

Tank clean and system chlorination where the inspection calls for it.

Remedial works

Dead legs removed, insulation corrected, TMVs serviced. We carry out the plumbing, so the assessment leads somewhere.

Review

Reassessed when the system changes or the use of the building changes, and periodically otherwise.

How it works

From assessment to monitoring.

Survey the system

Tanks, calorifiers, pipework, outlets, and how the building actually uses water.

Written assessment

Risks identified with a schedule of controls and who is responsible for each.

Controls in place

Monitoring set up, records started, remedials quoted.

Ongoing

Monthly temperature checks and annual tank inspection, scheduled so they do not lapse.

Common questions

Answered
plainly.

Does this apply to residential lettings?

Yes. Landlords have a duty to assess and control the risk in rented property. For a straightforward domestic property with a combi boiler and no stored water the assessment is short and the risk is low, but the duty to have assessed it still exists and is regularly missed.

Is a certificate issued?

There is no such thing as a legionella certificate, whatever anyone selling one tells you. What you need is a written risk assessment and a record of the controls being carried out. Anyone offering a certificate is describing something the regulations do not recognise.

How often does it need redoing?

There is no fixed statutory interval. The assessment must be reviewed regularly and whenever there is reason to believe it is no longer valid, such as changes to the system, the building's use, or a case of legionellosis. Two years is a common review period for a stable system.

Where does the risk actually come from?

Water sitting between roughly 20 and 45 degrees, in places where it stagnates. Cold water tanks, unused outlets, dead legs of pipework left behind after alterations, and showers that are rarely run. Void and low-occupancy properties are higher risk, not lower, because the water sits.

Who carries out the assessment?

A trained assessor. There is no legal monopoly on this work and no scheme you must belong to, which is why we can offer it directly rather than through a specialist. We will tell you the assessor's training before you instruct.

Which areas do you cover?

All 32 London boroughs, with a focus on west and south-west London.

Get started

Tell us the property
and we will survey it.

A site visit, an honest recommendation and a fixed written quote. London-wide.

Message us
Call GMAS on 07498 597339