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Florida’s thousands of lakes are shallower than most people realize, and some unique properties of shallow lakes make them challenging to restore if they have been degraded by nutrients or other pollutants. For many Florida lakes, improvement of water quality now is mandated by the federal Clean Water Act, because human activities have over-enriched their waters with nutrients. Two nutrients that most often pollute lakes are nitrogen and phosphorus. These occur naturally in the environment, including in lakes, and they are essential to the growth of aquatic life. However, when higher than natural levels occur due to human inputs, this can have undesired effects, such as blooms of toxic algae and reduced water clarity (Conley et al. 2009; Lewis et al. 2011).

Deep Problems in Shallow Lakes: Why Controlling Phosphorus Inputs May Not Restore Water Quality