Satellite Tool Tracked Winter Manure Spreading in Wisconsin

A new satellite model helps monitor winter farm runoff that may compromise local water safety.

Updated on Oct. 14, 2026 in Organic Food

Isometric editorial illustration showing a snowy agricultural field with rectangular dark patterns, representing winter manure monitoring for water safety. — Researchers in Wisconsin have deployed a new satellite-based analysis tool to monitor winter manure spreading patterns and reduce agricultural nutrient runoff. AI Illustration. Upload story photo >

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Should local regulators use satellite technology to monitor and enforce agricultural waste spreading rules?

In August 2026, researchers published an analysis detailing the use of an open-source satellite tool to track manure spreading on snow-covered fields in Wisconsin. This technology aims to identify agricultural practices that contribute to water pollution during winter months.

Why it matters

When waste is spread on frozen ground, soil cannot absorb the nutrients, leading to harmful runoff into watersheds. Monitoring these patterns is a key step toward improving local water quality management and accountability.

A study published in Remote Sensing Applications: Society and Environment analyzed satellite imagery to identify 1,094 instances of winter waste spreading. Researchers confirmed 66.6% of these detections occurred within impaired watersheds, though the long-term impact on local water remains under study.

The players

Environmental Law & Policy Center

A public interest environmental law organization that uses legal advocacy and scientific tools to protect clean water.

University of Wisconsin

A public research institution that investigates agricultural practices and their impact on regional water quality.

The details

The model utilizes data from Landsat and Sentinel-2 satellites processed through Google Earth Engine to detect specific wavelengths associated with manure on snow. By identifying spreading patterns in 10-to-30-meter resolution pixels, the tool flags potential risks even on large, permitted CAFO-managed fields. Grassroots verification teams then confirmed these automated detections by photographing the sites from public roads.

1972: Landsat began recording land surface data.
2024-2026: Researchers analyzed winter manure spreading patterns in Wisconsin.
August 2026: The study was published in Remote Sensing Applications: Society and Environment.

Health Landscape

This satellite tool introduces a new layer of surveillance for agricultural runoff, setting a precedent for transparent monitoring in the Great Lakes region. It sits in contrast to the regulatory approaches used in states like Michigan, which strictly prohibit spreading during peak runoff windows.

Winter runoff can influence the quality of private wells and public water supplies in agricultural areas. Residents concerned about water safety in impaired watersheds should consult their local health department regarding regular water quality testing schedules.

The takeaway

Advancements in satellite technology are providing new ways to monitor how agricultural runoff impacts local ecosystems. Residents can track ongoing developments in watershed management by monitoring state-level environmental reports and local water quality testing advisories.

What happens next

The researchers plan to release tutorials for watershed groups and community organizations to begin using the satellite model independently by late 2026.