What to Know About the Blue-Green Algae in the Ohio River

Story courtesy of Weelunk partner West Virginia Public Broadcasting

Accompanying story here: Listen

Algal bloom in Sistersville, West Virginia. August 28, 2015 “It is there some days and others it’s gone,” says photographer and West Virginia resident Ethan Wells. “Just depends on how bright the sun is and how fast the river flows.” Photo by Ethan Wells


The West Virginia Department of Health and Human Resources’ Bureau for Public Health issued a Public Health Advisory in response to the blue-green algae blooms in the Ohio River and in some of its tributaries.

In a release, Commissioner of the Bureau for Public Health Dr. Rahul Gupta said his office is working with public water systems and the state’s Department of Environmental Protection to monitor water supplies. A this point his office is simply warning citizens to avoid contact with the blooms.

From West Virginia’s Bureau for Public Health:

Public water systems are being advised to remain vigilant and tests performed, where appropriate, have been acceptable.

Citizens should avoid water that:

  • Looks like spilled paint
  • Has surface scums, mats or films
  • Is discolored or has colored streaks
  • Has green globs floating below the surface

The following guidelines are recommended to avoid exposure to harmful algal blooms (HABs):

  • Direct contact with affected water — including swimming, wading, fishing, paddling, diving and water skiing — may result in symptoms. Avoid swallowing river or lake water.
  • Prevent pets and livestock from coming into contact or ingesting water containing algal blooms.
  • People who are prone to respiratory allergies or asthma should avoid areas with algal blooms. Children may be particularly sensitive.
  • If contact has been made with water containing algal blooms, wash off with clean water. In some cases, skin irritation will appear after prolonged exposure. If symptoms persist, consult your health care provider.
  • Fish fillets (not organs) may be consumed after the fillets have been rinsed in clean water.

Cyanobacteria, also called blue-green algae, are microscopic organisms found naturally in all types of water. But some give off what are called cyanotoxins. Symptoms from contact are wide ranging. They include everything from loss of appetite to stumbling, tremors, convulsions, diarrhea, and skin irritation. Gupta says more serious or life-threatening reactions can occur if someone has an allergic reaction but no such cases have been reported in West Virginia.

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The blooms are historically uncommon in the Ohio River. A series of circumstances likely led to the organisms flourishing in the river and tributaries including:

  • slight drops in water temperature
  • low water flow
  • abundance of nutrients which could be from agricultural runoff and sewage
  • clear skies (blue-green algae love sunshine)



Dr. Gupta says water tests are underway to try to determine what kinds of nutrients are feeding the organisms. He says local health departments may issue a No Contact Advisory if toxin levels exceeded the advisory threshold, or if one or more probable cases of human illness or pet deaths is attributable to the toxin.

Multiple agencies are actively monitoring the algae situation along the Ohio River including the Ohio River Valley Water Sanitation Commission, Ohio Environmental Protection Agency, Kentucky Division of Water, West Virginia Department of Environmental Protection and local health departments.

West Virginia’s DEP has compiled a group of aerial photos of the blooms, complete with a map and details of photo locations: Here


Pt. Pleasant, WV. Courtesy of West Virginia Department of Environmental Protection
Marietta, Oh. Courtesy of West Virginia Department of Environmental Protection