Water

Prof. Charles Harvey speaks with Newsweek reporter Jasmine Laws about the Environmental Working Group (EWG)’s Tap Water Database which has revealed that 29 states have one or more water utilities with levels of “arsenic higher than the EPA’s maximum containment level.” Harvey shares: "I’m not surprised that this many water utilities would need to treat their water for arsenic, but I am surprised that this many fail to do so.” 

Prof. Xuanhe Zhao and his research group have been named one of the winners of the 2025 Gizmodo Science Fair for their work “creating an atmospheric water harvesting device that could improve access to potable water in the most remote, arid regions of the world,” reports Ellyn Lapointe for Gizmodo. “We are truly proud and excited about this work—and about the potential to help people most in need of safe drinking water,” Zhao said.

Prof. Xuanhe Zhao and his colleagues have developed an atmospheric water harvester to produce safe drinking water, reports Robert F. Service for Science. “The team sandwiched the hydrogel, which contains lithium-chloride salt, between two glass sheets,” explains Service. “At night, water vapor enters the gel and is trapped by the salts. During the day, sunlight heats the gel, evaporating the water. The vapor condenses on the glass panels, forming droplets that trickle down and are captured.” 

Researchers at MIT have developed a new atmospheric water harvester that eventually could be used to supply safe drinking water worldwide, reports Sarah Bregel for Fast Company. The device is “about the size of a standard window” and made from “hydrogel, a material that absorbs water, and lithium salts that can store water molecules,” explains Bregel. 

MIT researchers have developed a new “window-sized device that can convert vapor from air into safe drinking water using hydrogel,” reports Matthew Burgos for designboom. “With the invention, the MIT engineers want to make it easier for people to produce clean drinking water in places where there’s no river, lake, or well,” Burgos explains, “and where the only source accessible to them that can be converted into water is air.”

MIT researchers have developed a power-free, water-collecting device that extracted a glass of clean water from the air in Death Valley, California, suggesting that “the device could provide the vital resource to arid regions,” reports Alex Wilkins for New Scientist.“Because the design of this device is quite a compact structure, we believe that an even larger area of the device can supply the drinking water for a household for daily consumption,” explains Prof. Xuanhe Zhao.

Prof. Amos Winter speaks with WBUR reporter Grace Griffin about his work developing a desalination system that relies on solar power. “The majority of water you find in the ground around the world is salty,” says Winter. “The reason we use solar power is that most people around the world are going to be resource-constrained. They may have lower income levels or not have access to grid electricity. So, our technology makes desalination much more accessible in all areas around the world.”

MIT engineers have developed a new system that helps pesticides adhere more effectively to plant leaves, allowing farmers to use fewer chemicals without sacrificing crop protection, reports Michigan Farm News. The new technology “adds a thin coating around droplets as they are being sprayed onto a field, increasing the stickiness of pesticides by as much as a hundredfold.”

“A breakthrough from MIT researchers and AgZen, a spinoff company, is making agricultural spraying more efficient—cutting pesticide waste, lowering costs, and reducing environmental impact,” reports Rural Radio Network. “The technology works with existing sprayers, eliminating the need for costly equipment changes. In field tests, it doubled product retention on crops like soybeans and kale. AgZen’s spray-monitoring system, RealCoverage, has already helped farmers reduce pesticide use by 30 to 50 percent, and the new coating could improve efficiency even further.” 

Financial Times reporter Clive Cookson spotlights how MIT researchers have developed a “new filtration material based on natural silk and cellulose that removes a wide range of PFAS, while having antimicrobial properties that prevent fouling by bacteria and fungi.” 

Research Scientist Susan Amrose speaks with Knowable Magazine reporter Lele Nargi about the use of inland desalination for farming communities. Amrose, who studies inland desalination in the Middle East and North Africa, is “testing a system that uses electrodialysis instead of reverse osmosis,” explains Nargi. “This sends a steady surge of voltage across water to pull salt ions through an alternating stack of positively charged and negatively charged membranes.” 

MIT researchers have developed a new filtration material, created from natural substances, that could be used to remove “forever chemicals” like PFAS and heavy metals from drinking water, reports Matt Fortin for NBC Boston. "That's a huge advantage of our system, which is that we are using fully renewable, biodegradable and compatible material to resolve this long-lasting problem," explains postdoc Yilin Zhang. 

MIT researchers have developed a new filtration material capable of removing PFAS and heavy metals from water while possessing “antimicrobial properties that prevent the filters from becoming fouled over time,” reports Sujita Sinha for Interesting Engineering. “By combining silk and cellulose and using a method that aligns the silk molecules into nanofibrils, [the researchers] created a hybrid material with unique properties perfect for water filtration,” explains Sinha. 

Anurag Bajpayee MS '08, PhD '12 and Prakash Govindan PhD '12 founded Gradiant, an MIT startup “trying to reduce both costs and energy while eliminating chemicals” in water, reports Diana Olick for CNBC. “We take highly contaminated wastewater which contains solvents, which contains dissolved salt, which contains organics, and we eliminate the entire liquid waste,” says Govindan.