Global wastewater production and treatment levels are significantly higher than previously estimated

Nature · Published 1 October 2026 Swipe more like this →

In short: Researchers compiled a comprehensive global database to estimate the scale of domestic and manufacturing wastewater. They found that while 359.4 billion cubic meters of wastewater are produced annually, only about half is treated, with roughly 48% being released into the environment without any treatment.

The study provides a high-resolution map of water management, identifying significant disparities based on economic development. For instance, high-income countries produce 41% of global wastewater despite making up only 16% of the population. Conversely, regions like the Middle East and North Africa show high rates of intentional reuse.

The team used a data-driven approach by standardizing existing country-level records and using multiple linear regression to fill in gaps. The results were then downscaled to a 10 km resolution. A limitation of this study is that it relies on the availability and quality of underlying online data resources.

Why it matters: Understanding global water cycles is essential for identifying pollution hotspots and managing resources in a circular economy.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?

Related

• Only about half the world's sewage gets treated before release
• Human activities and natural processes both drive the degradation of global water quality
• Global plastic production reaches 370 million tons with very low recycling rates
• A new large-scale model maps water quality and availability across Europe
• Can we safely turn the water we flush into the water we drink?
• Greenland and Antarctic ice sheets have significantly accelerated their mass loss since 1992
• Global temperature extremes have shifted toward warmer nights and fewer cold nights
• Groundwater depletion threatens to significantly reduce cropping intensity across India
• Heat stress on farmers could be as damaging to food security as crop loss
• Global permafrost temperatures increased significantly between 2007 and 2016
• High fluid pressure may drive deep-seated slow slip and tremor
• Global nitrous oxide emissions have risen by 40 percent since 1980

More in Nature · Latest · A–Z · All topics