Fishing Boat Gray
I am investigating why a lake is polluted and we need to find out what element could be the cause.?

We are investigating why a lake is polluted and what could be the cause. The lake offers activities like boating in the summer, snowmobiling in the winter along with ice fishing. There is a ski area of snow that melts on the lake. Sewers are about 50 years and seem to be too close to the lake. There is a farm that is the highest elevation that could aa flow into the lake. Other things that are about a year-round hotel, golf courses (course in high elevation can flowing into the lake) and the apple orchid. The lake sediment appears to be covered and have gray matter. We wonder what could be the pollution and how it is doing, what element is, and how we can fix it. Category

You are approaching the opposite. First find out what is contaminating the lake. After researching possible sources. You may want to start the match, especially if the lake algae blooms during the summer. If so, check all nonpoint sources.