The Illinois EPA issued a report last month, saying the water in Spring Lake in Macomb had elevated levels of the herbicide atrazine.
The Illinois EPA said it detected higher than acceptable levels of a crop herbicide in the lake that provides Macomb much of its water.
An environmental group wants to make public all of the court documents related to a settlement involving Syngenta and water contamination from one of its herbicides.
Under a recent class-action lawsuit, agricultural chemical company Syngenta will have to pay cities and towns across the Midwest for contaminating water supplies with the herbicide atrazine. This includes several in Western Illinois.