The main nutrient that contributes to excessive weed and algae growth in lakes is phosphorous. Major sources include human and animal wastes, soil erosion, fertilizer runoff from farms and lawns, and detergents. Because phosphorus acts as a fertilizer, it is VERY important to prevent its introduction into the lake. Phosphorus levels should be maintained below 30 micrograms per liter (m g/L) to prevent algae blooms. We currently sample the lake for Phosphorus at the surface and bottom, as well as three inlet streams. The samples are then sent to a lab for analysis.