Evaluation of Pond Water Quality. Sarah Kostick. Potential Problem. High levels of phosphorus in pond environments can cause excessive algae blooms which result in lowered dissolved oxygen levels and very green ponds (eutrophication). Goals.
Lake Minnewashta in 2011 was at .021 ppm (21 ppb)
Critical Eutrophication Value is 0.06 ppm (60 ppb)