Water Waste Is A Design Failure

11 June 2026

Steve Harding, Founder and CEO of Showerkap, warns water is one of our most precious resources, yet the UK does not realise that we’re at risk of running out.

The Environment Agency warning that the UK is facing water supply shortages by 2050 unless rapid action is taken¹ and demand outstripping supply each year, the need for innovative water conservation has never been more urgent.

>

Fortunately, water-saving technology is on the rise, with UK-based solutions leading the way in both commercial and domestic settings.

In hotels, remote smart systems have been created to monitor and manage overall usage, which could help conserve billions of litres each year. Many hotels have also installed dual-flush toilets, fewer towel changes and low-flow taps to reduce water waste without compromising guest comfort. In homes, similar technologies, such as aerated showerheads and smart leak detectors, are becoming increasingly accessible.

Innovations in Behavioural Tools

One area of innovation is the use of rainwater harvesting systems in both commercial and residential buildings. These collect water, which can then be used for flushing toilets or watering gardens, significantly reducing demand on the mains water supply. Greywater recycling systems, which reuse water from sinks and showers, are also gaining popularity.

These technologies not only contribute to water conservation but also support sustainability goals like the UN’s Sustainable Development Goal 6 to ‘ensure availability and sustainable management of water and sanitation for all’. By investing in these systems, businesses can make a meaningful contribution to water stewardship.

Water efficiency is often treated as a technical challenge. Specify the right fixtures, install efficient systems and ensure regulatory standards are met.

In reality, many buildings that meet or exceed efficiency specifications still underperform when it comes to actual water use. The reason is simple – they are designed for ideal conditions and not real behaviour.

In a UK pilot study which launched in 2025, smart-technology using behavioural prompts in hotel showers have reduced water use by over half, illustrating how gentle nudges can reshape habits.

In another study, technology trialled by researchers at the University of Surrey² involving 17,500 hotel showers in the UK, Denmark and Spain, shower lengths were reduced by up to 26% – the equivalent to around 10 litres of (hot) water per shower. Researchers explored a behaviour change technique known as continuous, real-time eco-feedback, feeding instantaneous information back to a user with the purpose of reducing their environmental impact. 

The research could lead to better strategies for tackling water use in the tourism industry, where people can use up to 250 more litres of water per day than at home.  

The Limitations of Tech

There is no technology solution that lets us keep using water as if it’s an endless resource. The sustainable long-term approach is to use less, waste less and value more. Changing behaviour isn’t easy – but with the right tools, informed policies and a willingness to make different choices, it is the most powerful option.

The World Economic Forum has already warned that without a circular approach to water³ – reuse, efficiency and more system-wide planning – digital growth could be hindered by physical limits.

This could influence everything from design guidelines and procurement criteria to post-occupancy evaluation and facilities management strategies.

The built environment has made significant strides in energy efficiency by acknowledging the role of human behaviour. Water efficiency is now at a similar inflection point.

We need innovations that are more water-efficient, along with technology that improves the user experience, engaging and empowering people and subsequently delivering a significant reduction in usage. 

The Gap Between Specification and Reality

In utilities, housing and facilities management, success is typically measured through design compliance and system performance. Flow rates, pressure levels and consumption benchmarks are all carefully calibrated.

But these metrics assume a level of user behaviour that rarely exists in practice. In the bathroom, one of the biggest culprits of water waste stems from long showers, with over 2 billion litres going down our drains every day⁴.

While individual actions vary, patterns of behaviour are remarkably consistent. People respond to convenience and follow cues in their environment.

The problem is that many water systems ignore these patterns. They are engineered for technical optimisation, not behavioural alignment.

For example, a low-flow showerhead may reduce the rate of water use, but if it leads to longer shower durations to compensate, the intended savings are lost. Similarly, the absence of any feedback or time awareness in a shower environment encourages overuse, simply because there is no natural signal to stop.

The Key Role of Facilities and Housing Providers

For facilities managers and housing providers, this represents a significant opportunity.

Crucially, behavioural interventions are often faster and more cost-effective to implement than major system upgrades. They can be retrofitted, scaled and adapted with relative ease.

Unlike utilities, which operate at a network level, these sectors have direct influence over the environments where water is consumed. They can shape not just the infrastructure, but the interaction between user and system.

In multi-occupancy housing, for example, small inefficiencies are multiplied across hundreds or thousands of residents. In hospitality or leisure facilities, high turnover and intensive usage amplify the impact of behavioural patterns. Even modest improvements in user behaviour can translate into substantial reductions in water and energy costs and carbon reduction and there is a growing case to include behavioural science techniques to help change habits.

Rethinking Standards and Best Practice

If water waste is, in part, a design failure, then addressing it requires changes not only in individual projects but in industry standards.

Current frameworks tend to prioritise measurable system outputs – litres per minute, efficiency ratings, compliance thresholds. While these are important, they do not capture the full picture.

Continuing to rely solely on technical solutions will deliver incremental gains, but it will not close the gap between expected and actual performance.

To do that, the sector must embrace a more holistic approach – one that integrates engineering with behavioural insight.

Because ultimately, buildings do not use water. People do.

And if we want to reduce water waste at scale, we need to start designing with that simple fact in mind.

1. Environment Agency warning that the UK is facing water supply shortages by 2050 unless rapid action is taken – see here.

2. Technology trialled by researchers at the University of Surrey – see here.

3.  World Economic Forum has already warned that without a circular approach to water – see here.

4. Over 2 billion litres going down our drains every day – see here.

Picture: An image of Steve Harding, Founder and CEO of Showerkap.

Article written by Steve Harding | Published 11 June 2026

Share

Related Articles