🚰 The worst part of dishwashing: water, sponge, or microplastics?

When it comes to dishwashing, the environmental impact is often associated with detergents or the choice of utensils. A new analysis challenges this idea.

A team of researchers conducted a study involving households in Germany and North America to evaluate different cleaning habits. This field data was cross-referenced with laboratory experiments using a device that replicates scrubbing action. This hybrid method provided a more accurate picture of real behaviors and their effects.


Thus, the study confirms that kitchen sponges do release microplastics over the course of use. The annual quantities per individual vary depending on the type of sponge, with those containing less plastic naturally emitting less. However, these releases remain limited on a per-person scale.

Taking a broader view, the scientists compared the effect of these microplastics with that of the water consumed during cleaning. Their verdict is clear: the hot water used is responsible for 85 to 97 percent of the total environmental footprint. Plastic fragments contribute only a very small share of the damage caused to ecosystems, even when the figures are extrapolated to a national scale.

The information gathered from households provided a better understanding of daily behaviors. By observing how people clean their plates and pans, the researchers refined their estimates beyond laboratory simulations alone.

Several simple actions can reduce the environmental impact of dishwashing. Reducing the amount of water used proves to be the most effective measure, ahead of choosing sponges with low plastic content. Extending the lifespan of these utensils also helps lower overall resource consumption.

Environmental assessment of everyday products

To measure the environmental impact of an object like a sponge, researchers use analysis methods that take into account its entire life cycle. This includes manufacturing, use, and end-of-life, quantifying the resources required and the waste produced at each stage.

In the case of dishwashing, this approach shows that the use phase, particularly the volume of hot water used, is the most costly for the environment. The energy required to heat the water and the treatment of wastewater represent a significant part of the balance, sometimes more important than the materials making up the sponge itself.

These analyses help identify the most effective levers for action to reduce our footprint on the planet. They indicate that simple adjustments in our habits, such as moderating our water consumption, can have a much greater influence than material choices that are sometimes more difficult to implement.