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Blue Green Algae Fact Sheet
Background
Blue-green algae are microscopic organisms that are naturally present in lakes and streams. Some blue-green algae can produce algal toxins that could pose a health risk to people and animals when they are exposed to them in large enough quantities. This fact sheet answers questions about blue-green algae and algal toxins.
What are blue-green algae?
Blue-green algae, also known as cyanobacteria, are microscopic organisms that are naturally present in lakes and streams. They are usually present in low numbers. However, blue-green algae can grow quickly and become very abundant in warm, shallow, undisturbed surface waters that receive a lot of sunlight. When this occurs, they can form blooms that discolor the water or produce floating rafts or scums on the surface of the water. These blooms are primarily a concern during the summer months in Illinois.
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