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What is Blue Green Algae?

Blue green algae is often found in lakes around Oklahoma during the summer. What is blue green algae and what do you need to do when it’s found?

Blue green algae, what it is and why you need to avoid it

The Grand River Dam Authority has reported that the Fly Creek area of Grand Lake has high levels of blue-green algae.

When the GRDA first reported the high levels on Friday, June 16, BGA densities were at more than  100,000 cells per milliliter with more than 20 micrograms per liter of microcystins is considered toxic.

There is currently a public advisory to avoid bodily contact with the water in the Fly Creek area of Grand Lake. Testing will continue daily as long as conditions warrant.

You can find the condition of other lakes around Oklahoma by visiting the Travel OK lake condition page. And if you see algae play it safe and avoid the area.

What is Blue Green Algae?

Blue Green Algae in Oklahoma

Photo property of the Tulsa District, U.S. Army Corps of Engineers

Blue-green algae consists of tiny bacterial organisms. It can be found in all types of water including lakes, streams and pounds. Usually it’s found in low numbers but things like warm, stagnant water, heavy sunlight, and phosphorous or nitrogen can cause it to become abundant. Phosphorous and nitrogen can end up in the water from fertilizer and some household products.

Why is it Dangerous?

Some blue-green algae produces neurotoxins or hepatotoxins (live toxins), as well as toxins that can be harmful to the skins and gastrointestinal tract.

Exposure to these toxins can cause upper respiratory problems, vomiting and diarrhea, eye irritation, and a number of other health concerns. These toxins also can impact animals.

What to do if Blue Green Algae is Found?

  • Don’t drink untreated water.
  • Don’t swim, water ski, wade, or boat in areas where the water is discolored or where you see foam, scum, or mats of algae on the water.
  • If you swim or wade in water that may have blue green algae present, rinse off with fresh water and soap. This is also an effective method of reducing exposure for pets.
  • Don’t let pets or livestock swim or drink where water is discolored or where you see foam, scum, or mats of algae on the water.
  • Respect all water and beach closures.

You are also asked to please report any potential algae blooms to the local project office or the Oklahoma Dept. of Environmental Quality at 1-800-522-0206.

If you or a pet experiences nausea, vomiting, diarrhea, eye irritation, skin rays, respiratory symptoms or other unexplained illness, call your doctor or veterinarian.

For more information on blue green algae, visit Travel OK Lake Conditions



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Lisa Sharp is the founder of Green Oklahoma. She is passionate about the environment and improving Oklahoma for future generations. She also writes on her personal blog Retro Housewife Goes Green.

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