Handheld Device Transforms PFAS Testing on the Spot

A UChicago-Argonne breakthrough enables ultra-fast, ultra-sensitive PFAS detection for smarter water monitoring

24 Oct 2025

America’s water industry may never test the same way again. Scientists at the University of Chicago and Argonne National Laboratory have created a portable sensor that detects PFAS, the toxic “forever chemicals” found in everything from frying pans to firefighting foam, in just minutes.

Published in Nature Water on September 25, 2025, the device arrives at a pivotal moment. The Environmental Protection Agency is tightening limits on PFAS compounds such as PFOA and PFOS to parts-per-trillion levels, and utilities are scrambling to comply. Traditional tests often take weeks and rely on costly lab equipment, leaving smaller towns behind.

This new handheld sensor changes the equation. It can spot PFAS at roughly 250 parts per quadrillion, far beyond the sensitivity of most current methods, and it delivers lab-grade accuracy right on site. The system combines transistor-based sensors with AI-designed molecular probes to provide instant readings. “We wanted communities to know what’s in their water immediately, not weeks later,” said one of the project’s lead researchers.

Analysts say the advance could energize the fast-growing market for intelligent water management, where digital monitoring and automated infrastructure already promise more efficient systems. Companies like Xylem and Autodesk may soon integrate similar sensors into their digital twin platforms, giving utilities a clearer view of water quality in real time.

There are still hurdles such as cost, durability, and standardization, but experts are optimistic. “This is the kind of innovation the industry has been waiting for,” said a senior analyst at the American Water Works Association.

For a sector often slowed by regulation and aging infrastructure, the message is refreshing: water innovation is finally flowing faster.