In this undated photo provided by the Minnesota Pollution Control Agency, crews testing water in the Minnesota River near Shakopee, Minn., in August 2012. Oxygen levels are up in the Minnesota River, a key indicator that one of the state's dirtiest waterways is getting healthier and that efforts to reduce pollution from wastewater treatment plants are working, the Minnesota Pollution Control Agency announced Monday, Nov. 12, 2012. (AP Photo/Minnesota Pollution Control Agency)
Read the article: MPCA says Minnesota River becoming healthier
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