Understanding
Understanding
Your Obligations as a Duty Holder
Managing Legionella risk is a legal responsibility for anyone who owns, manages, or controls a building with a water system. If you fall into this category, you are considered the duty holder, and you are legally responsible for ensuring that water systems are safe and compliant.
Understanding what this means in practice is essential. Legionella control is not a one-off task or a tick-box exercise. It requires a structured, ongoing approach supported by clear responsibilities, effective systems, and competent management.
Who is the Duty Holder?
The duty holder is typically:
An employer
A landlord
A facilities manager
Or any person in control of premises
In many organisations, this responsibility may sit with multiple individuals, but ultimately, accountability cannot be delegated. Even where external specialists are used, the duty holder remains legally responsible for compliance.
Appointing a Responsible Person
One of the most important steps in managing Legionella risk is assigning a Responsible
Person.
The Responsible Person is tasked with overseeing day-to-day water safety
management and ensuring that control measures are implemented effectively. This
individual must have sufficient knowledge, training, and authority to carry out their role.
Their responsibilities typically include:
- Managing the Legionella risk assessment
- Ensuring routine control measures are carried out
- Overseeing monitoring and water sampling
- Maintaining accurate records
- Coordinating any remedial works
In larger organisations, additional support roles may be required, but clear responsibility must always be defined. Without a designated Responsible Person, compliance can quickly become disorganised and ineffective.
Carrying Out a Legionella Risk Assessment
A Legionella risk assessment is the foundation of compliance. It identifies potential risks within the water system and defines the control measures required to manage them.
As a duty holder, you must ensure that:
- A suitable and sufficient risk assessment is carried out
- It is completed by a competent person
- It reflects the specific conditions of your site
- It is reviewed regularly, typically every two years or when changes occur. However, at SAS Water, we recommend annual risk assessments as a year is long enough for any system to not be compliant.
The risk assessment is not just a document. It is the framework that drives all ongoing water hygiene activities.
Implementing Control Measures
Identifying risk is only the first step. Duty holders must ensure that appropriate control measures are put in place and maintained.
These may include:
- Temperature control of hot and cold water systems
- Regular flushing of outlets to prevent stagnation
- Cleaning and disinfection of tanks and pipework
- Maintenance of system components such as TMVs
- Ongoing monitoring and inspections
Control measures must be tailored to the system and consistently applied. Failure to implement them effectively is one of the most common causes of non-compliance.
Monitoring, Sampling, and Record Keeping
Ensuring Competence
Ongoing monitoring is essential to confirm that control measures are working.
Duty holders must ensure:
- Routine temperature checks are carried out
- Water sampling is undertaken where required
- Results are reviewed and acted upon
- Accurate records are maintained
Documentation is a critical part of compliance. Records provide evidence that systems are being managed correctly and can be relied upon during audits or inspections.
Legionella control requires a level of technical understanding. Duty holders must ensure that anyone involved in managing water systems is competent, either through training or by using external specialists.
This includes:
- The Responsible Person, and a Deputy Responsible Person
- Staff carrying out routine tasks
- Contractors involved in maintenance or testing
Lack of knowledge or training is a common factor in compliance failures. Ensuring competence is key to maintaining control.
Who is the Duty Holder?
The duty holder is typically:
An employer
A landlord
A facilities manager
Or any person in control of premises
In many organisations, this responsibility may sit with multiple individuals, but ultimately, accountability cannot be delegated. Even where external specialists are used, the duty holder remains legally responsible for compliance.
Appointing a Responsible Person
One of the most important steps in managing Legionella risk is assigning a Responsible
Person.
The Responsible Person is tasked with overseeing day-to-day water safety
management and ensuring that control measures are implemented effectively. This
individual must have sufficient knowledge, training, and authority to carry out their role.
Their responsibilities typically include:
- Managing the Legionella risk assessment
- Ensuring routine control measures are carried out
- Overseeing monitoring and water sampling
- Maintaining accurate records
- Coordinating any remedial works
In larger organisations, additional support roles may be required, but clear responsibility must always be defined. Without a designated Responsible Person, compliance can quickly become disorganised and ineffective.
Carrying Out a Legionella Risk Assessment
A Legionella risk assessment is the foundation of compliance. It identifies potential risks within the water system and defines the control measures required to manage them.
As a duty holder, you must ensure that:
- A suitable and sufficient risk assessment is carried out
- It is completed by a competent person
- It reflects the specific conditions of your site
- It is reviewed regularly, typically every two years or when changes occur. However, at SAS Water, we recommend annual risk assessments as a year is long enough for any system to not be compliant.
The risk assessment is not just a document. It is the framework that drives all ongoing water hygiene activities.
Implementing Control Measures
Identifying risk is only the first step. Duty holders must ensure that appropriate control measures are put in place and maintained.
These may include:
- Temperature control of hot and cold water systems
- Regular flushing of outlets to prevent stagnation
- Cleaning and disinfection of tanks and pipework
- Maintenance of system components such as TMVs
- Ongoing monitoring and inspections
Control measures must be tailored to the system and consistently applied. Failure to implement them effectively is one of the most common causes of non-compliance.
Monitoring, Sampling, and Record Keeping
Ongoing monitoring is essential to confirm that control measures are working.
Duty holders must ensure:
- Routine temperature checks are carried out
- Water sampling is undertaken where required
- Results are reviewed and acted upon
- Accurate records are maintained
Documentation is a critical part of compliance. Records provide evidence that systems are being managed correctly and can be relied upon during audits or inspections.
Ensuring Competence
Legionella control requires a level of technical understanding. Duty holders must ensure that anyone involved in managing water systems is competent, either through training or by using external specialists.
This includes:
- The Responsible Person, and a Deputy Responsible Person
- Staff carrying out routine tasks
- Contractors involved in maintenance or testing
Lack of knowledge or training is a common factor in compliance failures. Ensuring competence is key to maintaining control.
Understanding the Legal Framework
Duty holders must operate in line with UK legislation and guidance, including:
Health and Safety at Work etc. Act 1974
Management of Health and Safety at Work Regulations 1999 (MHSWR)
Control of Substances Hazardous to Health Regulations (COSHH)
ACOP L8
HSG274
HSG282 for Spa Pools & Hot Tubs
HTM 04-01 in Healthcare Environments
These documents outline the expectations for managing Legionella risk, from risk assessments through to ongoing control and monitoring. Failure to comply can result in enforcement action, including fines and prosecution. More importantly, it can expose individuals to serious health risks.
Understanding the Legal Framework
Duty holders must operate in line with UK legislation and guidance, including:
Health and Safety at Work etc. Act 1974
Management of Health and Safety at Work Regulations 1999 (MHSWR)
Control of Substances Hazardous to Health Regulations (COSHH)
ACOP L8
HSG274
HSG282 for Spa Pools & Hot Tubs
HTM 04-01 in Healthcare Environments
These documents outline the expectations for managing Legionella risk, from risk assessments through to ongoing control and monitoring. Failure to comply can result in enforcement action, including fines and prosecution. More importantly, it can expose individuals to serious health risks.
Why Your Role Matters
Legionella control is ultimately about protecting people. Poorly managed water systems can lead to serious illness, particularly for vulnerable individuals.
As a duty holder, your role is to ensure that risks are identified, controlled, and continuously managed. This requires a proactive approach, not just reacting to issues as they arise. With the right systems, processes, and support in place, compliance becomes manageable and effective.
Take Control with SAS Water Ltd
Understanding your obligations is the first step. Ensuring they are properly implemented is where expert support makes the difference.
SAS Water Ltd provides comprehensive Legionella risk assessments, routine monitoring, water sampling, and full training and consultancy regarding compliance, tailored to your organisation.
