Around the world, water reallocation from rural to urban regions—the practice of transferring water from rural areas to cities to meet demand from growing urban populations – is intensifying. Researchers found that 69 cities with a population of 383 million people receive approximately 16 billion cubic meters of reallocated water per year—almost the annual flow of the Colorado River.

The products of wastewater treatment have been found to contain trace amounts of antibiotic resistant DNA. These products are often reintroduced to the environment and water supply, potentially resulting in the spread of antibiotic resistance.

At least 140 million people in 50 countries have been drinking water containing arsenic at levels above WHO guideline. A new study compares for the first time the effectiveness and costs of many different technologies designed to remove arsenic from groundwater.

Analysis of existing state and federal guidelines shows discrepancies in recommended safe levels of toxic contaminants PFOA and PFOS in drinking water. The findings of a new study highlight the need for enforceable federal standards and more health protective limits on these contaminants in drinking water to safeguard the health of millions of people whose water supplies have been contaminated.

Over 100 million people in Southern Africa have no access to clean water – many sources in rural areas are contaminated. In the SafeWaterAfrica project, African and European partners are working closely together to develop a decentralized system solution for water purification that can be operated and maintained autonomously by rural inhabitants. The system covers the clean water needs of several hundred people. Researchers at the Fraunhofer Institute for Surface Engineering and Thin Films IST are coordinating the project.

Upmanu Lall is director of the Columbia Water Center, chair of Earth and Environmental Engineering, and the lead author of the chapter on water resources in the latest U.S. National Climate Assessment. The report, issued two weeks ago, paints a troubling picture of the nation’s climate future, including projected droughts and extreme precipitation events that could worsen already existing problems with U.S. water supplies and infrastructure. Lall discusses the climate change-driven water challenges the U.S. faces, and ideas for how the nation can respond.

A simple device that can capture its own weight in water from fresh air and then release that water when warmed by sunlight could provide a secure new source of drinking water in remote arid regions, new research suggests.

The average person in Europe uses 3,000−5,000 liters of water per day, of which the lion’s share is spent on food production. The world’s limited water resources are becoming an even more pressing issue as populations grow and climate change causes droughts in both south and north. Studies have already provided a number of ways to reduce our consumption of water, but this valuable information is often left unused.

Seven Southwestern U.S. states that depend on the overtaxed Colorado River have reached landmark agreements on how to manage the waterway amid an unprecedented drought, including a commitment by California to bear part of the burden before it is legally required to do so.