Toxic Algae (Harmful Algae Blooms)
Algae is common and natural to our waters in Colorado. But a certain type of algae can produce toxins that can harm people, animals, and the local environment.
Toxic algae or harmful algae blooms are made up of what many people call blue-green algae. Technically, these organisms are a special type of bacteria called cyanobacteria or cyanoHABs. Although these organisms naturally occur in Colorado waters, they become a problem when they multiply rapidly, resulting in a dense cyanobacteria concentration or bloom. The blooms can become harmful when the cyanobacteria produce toxins. Learn more here... 
You’ll see notices like this at Rueter-Hess if Algae is present. Be assured that we test the water regularly to check for any unsafe levels and will close the water should levels ever become high.