Community scientists contribute time and energy to help assess the severity of road salt pollution across multiple states.
In October, volunteers from over 80 organizations, as well as individuals, added over 1,300 data points to the Stroud Center’s road salt data-collection effort. Data from the Fall 2026 Salt Snapshot continue to arrive.
The Importance of Fall Snapshots
Why do all these individuals contribute their time and energy to sample for road salt in October? During periods of low rainfall, our streams rely primarily on groundwater. And yes, we can measure road salt in some streams in October because the groundwater has been receiving significant salt for many years.
The highest recorded chloride concentration submitted for the 2026 Fall Salt-Pollution Snapshot is over 4,000 mg/L. That’s very high, and well over the EPA’s water quality criteria standard of 230 mg/L.
What’s Next
Our research team continues to review data across watersheds in Delaware, Maine, Maryland, New Jersey, and Pennsylvania, and we’re planning our next salt snapshot for Winter Salt Week, January 25–29.
