The Clearwater Lake Chain has elevated nutrient levels which lead to poor water quality. The City of Kimball and surrounding agricultural area drains, mostly untreated, into a trout stream which empties into the Clearwater River Chain of Lakes.
Comfort Lake is one of Chisago county's largest recreational lakes. Comfort Lake is of regional significance with public access for boating, fishing and swimming. A pollution reduction study was conducted for the lake because of decreasing water quality. This study identified highly urban areas as one of the sources of nutrients.
