How changing occupancy patterns affect water systems

How changing occupancy patterns affect water systems

Buildings are no longer used in the same way they were just a few years ago.

Hybrid working has reduced occupancy in many offices, schools experience long holiday closures, care homes often see changes in resident occupancy, and public buildings frequently have areas that are used less than others.

While these changes are usually planned from an operational perspective, they can also affect how water systems perform. As a result, organisations should regularly review their water safety arrangements to ensure they continue to reflect how the building is actually being used.

Understanding how occupancy affects water usage is an important part of maintaining safe, compliant water systems.

Why Occupancy Matters

Effective water safety management starts with understanding how water moves through a building.

When people use outlets regularly, fresh water continues to circulate throughout the system. However, when areas become little used or temporarily unoccupied, water can remain stagnant for longer periods.

For this reason, any significant change in occupancy should prompt a review of your water safety arrangements.

Buildings Are Becoming More Dynamic

Today’s buildings rarely operate in the same way all year round. As occupancy changes, your water safety management should adapt too.

For example:

  • Care homes may have rooms that become temporarily unoccupied while others remain fully occupied.
  • Schools may close during the holidays, while nurseries, offices or holiday clubs continue to operate.
  • Commercial offices often follow hybrid working patterns, leaving some floors or meeting rooms underused.
  • Hotels and leisure facilities experience seasonal peaks and quieter periods.
  • Local authorities manage a diverse estate, with each building following different occupancy patterns throughout the year.

Recognising these changes helps ensure your water safety programme continues to reflect the level of risk.

The Risks of Low Water Usage

When water usage decreases, several challenges can arise.

Little-used outlets

As taps, showers and other outlets are used less frequently, water can remain stagnant for longer periods. Consequently, these outlets may require additional flushing to help maintain water quality.

Changing water temperatures

Reduced water flow, combined with warmer ambient temperatures, can affect both hot and cold water temperatures. This makes regular temperature monitoring even more important, particularly during the summer months.

Outdated flushing programmes

Many flushing schedules are created when buildings operate at full occupancy.

However, if occupancy changes and the flushing programme remains the same, some outlets may no longer receive the attention they need, while others continue to be flushed unnecessarily.

Documentation that no longer reflects reality

Legionella Risk Assessments and Written Schemes should always reflect how a building is currently being used.

As buildings evolve, these documents should be reviewed and updated to ensure they remain accurate and appropriate.

Water Safety Plans Should Be Dynamic

One of the biggest misconceptions we encounter is that a water safety programme can remain unchanged year after year.

In reality, effective water safety management is continually reviewed and adapted.

As your building evolves, you should also review:

  • Flushing programmes
  • Monitoring activities
  • Legionella Risk Assessments
  • Written Schemes of Control
  • Roles and responsibilities

By reviewing these regularly, you can ensure your water safety arrangements continue to reflect the current level of risk.

How Technology Can Help

As occupancy patterns become more varied, many organisations are looking for greater visibility of their water systems.

Remote monitoring provides continuous oversight of water temperatures, helping identify trends and highlight potential issues that periodic manual checks may not reveal.

As a result, organisations can respond more quickly to changes in system performance and maintain greater confidence that their control measures remain effective, even as building usage changes.

Technology doesn’t replace good water safety management it supports better decision-making by providing timely information and greater visibility of your water systems.

Practical Questions to Ask

If occupancy within your building has changed, ask yourself:

  • Does our flushing programme still reflect how the building is being used?
  • Have any outlets become little used?
  • Are all areas of the building still included in our monitoring programme?
  • Does our Legionella Risk Assessment reflect current occupancy?
  • Have responsibilities changed?
  • Does our Written Scheme still accurately reflect the building and its water system?

Regularly asking these questions can help identify small issues before they develop into larger problems.

Supporting Safe Water Systems Every Day

Changing occupancy patterns don’t automatically increase risk. However, they should prompt you to review your water safety arrangements.

Whether you manage a care home, school, commercial office, leisure facility or public sector estate, understanding how your building is being used is essential to maintaining safe water systems.

At Nant, we work with organisations across multiple sectors to help them adapt their water safety programmes as buildings, occupancy patterns and operational requirements evolve.

If you’d like to review your current water safety arrangements or discuss how changing occupancy may affect your water systems, our team is here to help.