Surprising Shower Habits That Push Both Time and Water Bills Up, New Study Shows

It’s Not the Shampoo Itself - Everyday Shower Routines Drive Up Your Water Costs

According to НВ — Техно: Date: August 4, 10:00

With water conservation becoming increasingly urgent, everyday choices in the bathroom matter more than many people realize. A team from the University of Surrey in the UK analyzed data from 319 households in Germany, covering 8,550 separate shower sessions logged over one winter. The strongest influences on shower length were behavioral: applying shampoo twice or more added about 27 percent to the time under the water, shutting off the water three or more times added roughly 20 percent, soft water was linked to showers that ran about 23 percent longer, and people under 50 tended to shower longer. The study appears in the Journal of Environmental Management.

The researchers installed smart sensors in home bathrooms to log when and how participants showered, and asked them to fill out a questionnaire after every shower. The results showed that gender, employment status, household size, and even whether the person paid the water bill had little or no clear effect on duration. The biggest predictors of water use were what people did in the shower, not their background or living situation.

In the words of co-author Pablo Pereira-Doel, “What matters most is what you actually do in the shower.”

Digging into specific routines, the data showed that a shower with soft water lasted about 23 percent longer than one with hard water. Shampooing twice or more stretched the shower by 27 percent compared with a single application. And people who switched off the water at least three times spent about 20 percent more time in the shower than those who never hit pause.

Pereira-Doel said the findings point to the need for conservation solutions built around real behavior. “We need solutions that work with people’s habits, not against them,” he explained. “Behavioral cues, smarter feedback devices, and better product design can all help people use less water.”

Those insights could inform new water-saving strategies and lead to practical recommendations for households. More broadly, they highlight how being aware of daily routines can make a real difference in water consumption - an increasingly important goal in a water-stressed world.