Practical Water Hygiene Support for Residential Properties

Residential water systems range from simple individual dwellings to large apartment developments with communal cold water storage, boosted supplies, central hot water generation and extensive distribution systems.

For landlords, managing agents and property managers, understanding where responsibility sits — and applying controls that are appropriate to the actual level of risk — is essential.

Source Water Compliance provides independent Legionella risk assessments and water hygiene consultancy for residential developments, landlords, managing agents and property portfolios.

Our approach is practical and proportionate, taking account of the type of property, complexity of the water system, occupancy and people who may be exposed.

Request a Residential Legionella Risk Assessment

Residential Properties Are Not All the Same

A small mains-fed flat with an instantaneous water heater presents a very different water hygiene challenge from a twenty-storey apartment building supplied through communal storage tanks, booster sets and central hot water plant.

The level of assessment and control should reflect that difference.

HSG274 Part 2 states that all water systems require a risk assessment, but not all systems require elaborate control measures. In many simple residential properties, regular water use and high turnover mean the risk may be low and only straightforward controls are necessary.

Larger residential buildings, however, can contain systems such as:

Cold water storage tanks
Booster sets
Calorifiers
Central hot water systems
Hot water circulation systems
Communal distribution pipework
Landlord-controlled outlets
Showers
Thermostatic mixing valves
Expansion vessels
Water softeners
Point-of-use water heaters
External taps
Bin-store or cleaner facilities
Gyms and communal amenities
Low-use outlets
Vacant apartments
Redundant pipework

The risk assessment therefore needs to consider the actual property and water system rather than applying the same approach to every residential building.

Residential Legionella Risk Assessments

Our assessments can include a detailed inspection of communal and landlord-controlled water systems together with a review of existing Legionella management arrangements.

Depending on the property, this may include:

Incoming Water Supplies

Identification of incoming mains water supplies and how water is stored, boosted and distributed throughout the development.

Cold Water Storage

Inspection of communal cold water storage tanks, including condition, temperature, configuration, turnover and associated pipework.

Hot Water Systems

Assessment of calorifiers, central hot water generation, circulation systems and associated distribution.

Communal Areas

Review of landlord-controlled outlets located within:

Communal washrooms
Gyms
Changing areas
Concierge facilities
Management offices
Cleaner cupboards
Refuse areas
External locations
Resident amenity spaces

Representative Residential Areas

Where within the agreed scope, representative apartments or residential units can be considered to understand how the communal system interfaces with individual dwellings.

Low-Use Outlets

Identification of areas where poor water turnover or stagnation may occur.

Water Temperatures

Representative temperature measurements can be undertaken to assess the performance of hot and cold water systems.

System Configuration

Assessment of issues including:

Dead legs
Dead ends
Redundant pipework
Poor hot water circulation
Excessive pipe runs
Heat gain into cold water
Low water turnover
Inappropriate alterations

Landlords and Legionella Responsibilities

Landlords who provide residential accommodation have a legal duty to ensure that the risk of exposure to Legionella is properly assessed and controlled.

Where a managing or letting agent is involved, HSG274 states that the management agreement should clearly establish responsibility for maintenance, safety checks and Legionella management. If those responsibilities are not clearly allocated, responsibility generally remains with the person who has control of the premises and water system.

This makes clear responsibility particularly important for managed residential developments.

The assessment can help identify:

Who owns the system → who controls it → who monitors it → who maintains it → who responds to failures.

Apartment Blocks and Communal Water Systems

Large apartment developments can have considerably more complex water systems than individual houses or flats.

A typical building may contain:

Incoming mains → storage tanks → booster sets → risers → apartments

and, where centralised hot water is provided:

Cold water supply → calorifiers / hot water generation → circulation system → apartments → return system

In these buildings, problems in communal plant or distribution can potentially affect numerous residents.

Our assessments therefore consider both the major plant and how water is distributed throughout the development.

Void and Unoccupied Properties

Vacant properties can create a particular water hygiene issue because normal water turnover stops.

This may occur when:

A tenant moves out
An apartment is awaiting sale
Refurbishment is taking place
A development contains unsold units
Properties remain vacant between tenancies
Areas are temporarily taken out of use

HSE advises that stagnation should be considered during periods of non-occupancy and that appropriate flushing or other measures may be required.

A suitable management programme should therefore consider:

occupied property → void period → flushing / control → recommissioning → reoccupation

This is particularly useful for managing agents and housing providers responsible for large numbers of properties.

Residential Portfolios

Property organisations may be responsible for hundreds or thousands of individual properties.

Managing Legionella risk across a portfolio requires a proportionate approach.

Not every property requires the same level of inspection, monitoring or ongoing control.

HSE specifically recognises that many straightforward domestic water systems will be low risk and that compliance does not need to be unnecessarily burdensome.

Source Water Compliance can help distinguish between:

simple low-risk domestic systems

and

larger or more complex systems requiring additional management.

This helps property managers focus resources where they are genuinely required.

Housing Associations and Managed Estates

Large residential estates may include several building types constructed at different times.

A portfolio can contain:

Individual houses
Low-rise blocks
High-rise apartment buildings
Sheltered accommodation
HMOs
Hostels
Build-to-rent developments
Mixed-use developments
Older converted properties
Newly constructed apartment schemes

Each may require a different approach.

Using a consistent assessment methodology across the portfolio can make it easier to identify common issues, prioritise actions and demonstrate how Legionella risks are being managed.

Vulnerable Residents

The potential susceptibility of people exposed to the water should also form part of the assessment.

HSE identifies factors associated with increased susceptibility to Legionnaires’ disease, including age, illness and weakened immune systems.

This can become particularly relevant within residential environments occupied by older residents or people requiring additional support.

Where the resident population presents increased susceptibility, the risk assessment can take this into account when determining appropriate control measures.

No Unnecessary Testing or Over-Complicated Programmes

An important principle of residential Legionella management is proportionality.

HSE states that routine Legionella sampling is not normally required for ordinary domestic hot and cold water systems and also confirms that there is no legal requirement for landlords to obtain a so-called “Legionella test certificate.”

Our approach is therefore based on assessing the actual risk rather than recommending unnecessary testing or ongoing work.

Where a simple residential system presents little risk, the recommendations should reflect that.

Where a larger communal system presents greater complexity, appropriate controls can be identified.

Practical Recommendations — Not Just a Report

Where issues are identified, recommendations may include:

Reviewing flushing arrangements
Introducing procedures for void properties
Improving hot water circulation
Investigating excessive cold water temperatures
Removing redundant pipework
Maintaining cold water storage tanks
Reviewing tank turnover
Servicing thermostatic mixing valves
Reviewing communal outlets
Clarifying landlord and managing-agent responsibilities
Improving monitoring records
Updating the Written Scheme of Control
Reviewing reoccupation procedures
Undertaking further investigation where appropriate

The aim is to provide clear, proportionate recommendations that property teams can realistically manage.

Working in Accordance With Legionella Guidance

Our residential assessments take account of applicable HSE guidance including:

Approved Code of Practice L8 – Legionnaires’ disease

HSG274 Part 2 – The control of legionella bacteria in hot and cold water systems

L8 applies to employers and people with responsibility for controlling premises, including landlords, and covers matters including risk assessment, control measures and competent management.

HSG274 Part 2 contains specific guidance for shared premises and residential accommodation, including landlords and managing agents.

Supporting Property Managers Beyond the Assessment

Legionella Risk Assessments

Independent assessment of residential and communal water systems.

Written Schemes of Control

Development or review of site-specific procedures for larger or more complex residential water systems where appropriate.

Water Hygiene Audits

Independent review of existing management programmes, records and contractor performance.

Water System Schematic Drawings

Clear schematics showing communal storage, boosting, hot water generation and distribution systems.

Portfolio Reviews

Support identifying and prioritising higher-risk properties across a residential estate.

Water Hygiene Consultancy

Advice regarding void properties, refurbishment, sampling results, system changes and unusual water hygiene findings.

Residential Properties We Can Support

We can provide support for:

Apartment blocks
Residential developments
Build-to-rent developments
Housing associations
Social housing portfolios
Private landlords
Property management companies
Managing agents
HMOs
Hostels
Sheltered accommodation
Mixed-use developments
Residential estates
Multi-building developments
Communal landlord water systems
Multi-site residential portfolios

Independent Advice for Property Managers

Our focus is on identifying genuine risk and providing proportionate advice.

For residential property managers, that distinction is important.

A simple domestic system should not be managed like a major centralised apartment water system simply because both are residential.

Our assessments are intended to establish:

what the actual risk is, what controls are justified and where action genuinely needs to be prioritised.

Arrange a Residential Legionella Risk Assessment

If you are responsible for a residential block, property portfolio or communal water system and require a Legionella risk assessment or independent review of your existing arrangements, speak to Source Water Compliance.

We can discuss the properties, water systems and management arrangements to determine the appropriate scope of assessment.