Causes of decreased water quality
Local watershed studies have shown that water runoff is the most common cause of nutrients entering the lake. You might look for new areas on the island where vegetation ha been cleared. Take a kayak along the shore and look for erosion ruts on the shoreline.
Septic systems and fertilizer are other causes, but lower on the list. What is not in the report is the impact of boat wake stirring up the bottom. Nutrients tend to settle on the bottom. When wake washes through shallow areas, the nutrients are brought into the water column. Have you seen an increase in boat wake?
Water quality varies by the season. Typically, the dryer the season, the less algae (due to less runoff) but temperature is another factor.
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