Farm in southern Wisconsin
By Communications and Publishing
2013 (approx.)
![Photo showing cows feeding on a farm in southern Wisconsin.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/WI%20cows.jpg?itok=V9NHjA4o)
Detailed Description
Cows feed on a farm in southern Wisconsin. A new USGS report shows that drought periods followed by rainfall caused nitrate levels to increase to the highest ever measured in some Midwest streams during a 2013 study.
Sources/Usage
Public Domain.