Water News for May, 2026
For the first time, the EPA has flagged microplastics and pharmaceuticals as priority drinking water contaminants
America’s drinking water has carried microplastics and prescription drug residues for years. Washington is only now starting to officially care.
On April 2, 2026, EPA released its draft Sixth Contaminant Candidate List, designating microplastics and pharmaceuticals as priority contaminant groups under the Safe Drinking Water Act. Neither had previously held formal federal research status under drinking water law.
Science still has some catching up to do. No agreed-upon definition for microplastics in drinking water currently exists, and standardized testing protocols remain a work in progress. How quickly those gaps close will determine when utilities face hard compliance deadlines. — Water Treatment USA 2026.
Bottled water can contain hundreds of thousands of previously uncounted tiny plastic bits
A new microscopic technique zeroes in on the poorly explored world of nanoplastics, which can pass into blood, cells and your brain. In recent years, there has been rising concern that tiny particles known as microplastics are showing up basically everywhere on Earth, from polar ice to soil, drinking water and food. Formed when plastics break down into progressively smaller bits, these particles are being consumed by humans and other creatures, with unknown potential health and ecosystem effects.
One big focus of research is bottled water, which has been shown to contain tens of thousands of identifiable fragments in each container. Now, using newly refined technology, researchers have entered a whole new plastic world: the poorly known realm of nanoplastics, the spawn of microplastics that have broken down even further. For the first time, they counted and identified these minute particles in bottled water. They found that on average, a liter contained some 240,000 detectable plastic fragments — 10 to 100 times greater than previous estimates, which were based mainly on larger sizes.
Rivers Are Losing Oxygen at an Alarming Rate
Climate change is steadily stripping oxygen from rivers around the world, according to a new study published May 15 in Science Advances. Researchers found that this long-term oxygen decline is happening across most river systems, with tropical rivers emerging as the most vulnerable. The findings point to an urgent need for strategies aimed at slowing oxygen loss in freshwater ecosystems. A sweeping analysis found that nearly 80% of the world’s rivers have been steadily losing dissolved oxygen, with climate change identified as the main driver. Science Daily
Ocean Ice Is Melting Much Faster Than We Thought
In research focused on the Fimbulisen Ice Shelf in East Antarctica, scientists discovered that the shape of the underside of the ice shelf strongly affects how seawater circulates below it. Where deep channels exist beneath the ice, ocean currents can form small circulation patterns that keep warmer water trapped against the ice instead of allowing it to move away quickly. This concentrated warmth dramatically increases melting in those locations.
The researchers found that melting within these channels can increase dramatically. In other words, the structure of the ice shelf itself helps determine where heat collects and how much damage that heat can cause. In a word, ocean ice is melting much faster than we previously believed. Science Daily.
Researchers Find Evidence of Fabled Giant Squid
Scientist working in the ocean off the western coast of Australia have used DNA to detect many ocean species that have not yet been observed by humans. Among these most notably is a fabled giant squid. “Giant squid are among the ocean’s most mysterious animals. They can grow longer than a school bus (10 to 13 meters), weigh between 150 and 275 kilograms, and possess the largest eyes in the animal kingdom, reaching up to 30 centimeters across, roughly the size of a large pizza.” Science Daily.
Migratory Freshwater Fish Are in Rapid Decline
Some of the longest and most essential animal migrations on Earth take place beneath the surface of rivers. A major new report from the Convention on the Conservation of Migratory Species of Wild Animals (CMS), a United Nations environmental treaty, warns that many of these migrations are now rapidly breaking down. A sweeping global report finds that migratory freshwater fish are in steep decline, with populations down roughly 81% since 1970. These species depend on long, connected rivers, but dams and human pressures are cutting off their routes. Hundreds of species now need coordinated international protection. Experts say restoring river connectivity is critical to preventing further collapse. Science Daily.
Kabul, Capital of Afghanistan, Is Running Out of Water Rapidly
Kabul is rapidly running out of water. Its population relies mostly on groundwater extracted from wells. But the groundwater has been receding at an alarming rate, and some wells have to be dug as deep as 500 feet to reach it.
An April 2025 report by the aid group Mercy Corps said the level of Kabul’s aquifers had plunged by 25-30 meters (about 80-100 feet) over the past decade. Aquifers hold massive amounts of water deep under land surfaces. Water in them collects slowly over years as precipitation seeps in. Too much extraction from aquifers, or changes to the climate bringing less water, leads to depletion.
“Without large-scale changes to Kabul’s water management dynamics, the city faces an unprecedented humanitarian disaster within the coming decade, and likely much sooner,” it said.
Climate change, mostly caused by the burning of gasoline, oil and coal, has played its part. Repeated droughts have reduced snowfall, whose gradual melting can replenish groundwater. Instead, Kabul sees more sudden, heavy rainfall that leads to flooding but not enough of it reaches the aquifer. AP.
USGS Groundwater Drought Metrics
The U.S. Geological Survey Released a Pioneering Study of US Groundwater Levels a pioneering study analyzing groundwater levels across the conterminous U.S., providing tools to assess groundwater drought and inform water planning.
Nearly 27 million Americans, or 8% of the U.S. population, live in areas where water demand consistently approaches or exceeds naturally available water supply. Until now, accessing comprehensive water availability information required navigating fragmented datasets across multiple agencies. A new tool eliminates many of those barriers.
The USGS National Water Availability Assessment Data Companion provides water managers, agricultural communities and researchers with detailed information about water supply and demand across approximately 80,000 watersheds nationwide.
“While the United States has abundant water nationally, regional imbalances between supply and demand may create water challenges affecting millions of Americans,” said Shirley Leung, lead scientist. “This tool can help decision-makers understand whether challenges may stem from limited natural water supply, high demand, or both. This information is helpful for effective water planning.”
There are also water‑rich regions of the country where communities and water managers may use the tool to identify potential economic opportunities tied to their water supply, as well as to support long‑term planning to preserve and protect this vital resource. USGS.gov.
