How to Write a Legionella Written Scheme of Control

A written scheme of control is a legal requirement for any property or business where there is a risk of Legionella bacteria in the water system.

It’s your documented plan for managing that risk — and it must be tailored to your premises.

If you manage property in Doncaster, from a small rental flat to a large industrial site, having a proper written scheme is essential for both compliance and safety.

What Is a Written Scheme of Control?

The written scheme of control is a formal document that sets out:

The risk assessment findings – hazards identified in your system
Control measures – actions taken to prevent Legionella growth
Maintenance schedules – how often each task is carried out
Responsible persons – who is accountable for each activity
Record keeping – how data is logged and stored

This document serves as both a day-to-day management tool and a compliance record if the Health and Safety Executive (HSE) inspects your site.

Why It’s Required by Law

Under the Health and Safety at Work Act 1974 and the Control of Substances Hazardous to Health (COSHH) Regulations 2002, you must control exposure to Legionella bacteria.

The HSE’s Approved Code of Practice (ACOP) L8 specifically requires a written scheme of control for premises with a foreseeable risk.

Failing to have one in place — or having an incomplete or generic version — can lead to enforcement action, fines, and in serious cases, prosecution.

What to Include in Your Written Scheme

A strong written scheme of control should be site-specific and include:

System description – diagrams and explanations of hot and cold water systems
Temperature control measures – ensuring hot water is stored at 60°C and cold water below 20°C
Flushing regimes – for rarely used outlets
Cleaning and disinfection procedures – for tanks, pipes, and outlets
Inspection schedules – regular checks of temperatures, tanks, and equipment
Remedial actions – what to do if temperatures or other parameters fall outside safe limits
Record keeping – how data is logged and stored securely

Doncaster-Specific Considerations

Many Doncaster properties, especially older buildings, have inherited plumbing layouts with long pipe runs or disused branches.

These “dead legs” can create stagnant water areas where Legionella thrives.

In industrial and commercial sites, complex systems such as process water loops or cooling systems require detailed control measures.

For landlords, care homes, and hospitality venues in Doncaster, a well-prepared written scheme is not just about compliance — it’s a vital part of protecting residents, tenants, and customers.

How to Create One

Start with a Legionella risk assessment – This forms the basis of your written scheme.
Document all control measures – Include schedules and responsibilities.
Use clear, precise language – Avoid vague instructions.
Review regularly – Update if systems or occupancy change.
Store securely – Keep both digital and printed copies for inspection.

If you are unsure how to prepare a compliant scheme for legionella, a professional water hygiene specialist can create one for you.

Related Information

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