Lakes with many native aquatic plants are likely to have better water quality.
These plants consume phosphorous. There are lakes in southern Minnesota with 10-15 native aquatic plants with lake water that stays clear all summer long. Curly leaf pondweed and Eurasian Milfoil are not native. Removing these two invasive plants is good. Keeping native plants or planting more is good. Large curly leaf and Eurasian milfoil can be treated by a contractor and with a permit early in the spring before native plants start growing.
Lake Volney Association received a grant to restore native aquatic plants. 2 projects completed so far.