The primary conservation challenge for Lake Tahoe is the loss of water clarity, caused by pollution and invasive species.

Lake Tahoe is famous for its crystal-clear waters, but over the years, it has experienced a significant loss of clarity. This decline is primarily due to pollution from urban runoff, invasive species, and nutrient loading. Sediment and pollutants entering the lake from surrounding developments, combined with the spread of invasive algae and aquatic plants, have led to a decrease in the water's clarity. Efforts to combat this issue focus on reducing pollution, improving stormwater management, and protecting the lake’s ecosystem to preserve its unique clarity for future generations.