Nutrient Pollution

Harmful Algal Blooms

Harmful algal blooms are a major environmental problem in all 50 states. Known as red tides, blue-green algae or cyanobacteria, harmful algal blooms have severe impacts on human health, aquatic ecosystems and the economy.


Harmful algal bloom in St. Johns River, Florida

Stay Safe

Girl protecting her nose from algae's odor


Aquatic bird leaving wetlands covered in algae


Bright green algae