UACES Facebook As summer blooms, be on the lookout for algae to follow suit
skip to main content

July 24, 2020

As summer blooms, be on the lookout for algae to follow suit

By the U of A System Division of Agriculture 

Fast Facts:

(477 words)
(Newsrooms: With additional art available at
(Download this story in MS Word format here.) 

LITTLE ROCK — As temperatures rise and summer moves into full swing, wildlife on the water is also returning to its seasonal proclivities — for better and for worse. As of July, the first harmful algal blooms of 2020 have been reported in Arkansas. 

GREEN WATERS — Harmful algal blooms (HABs) often begin to occur in early to mid-summer in Arkansas, as temperature rise. A fact sheet for identifying and sanitizing HABs is now available from the UofA System Division of Agriculture. (Photo courtesy of Brad Austin, Arkansas Water Resources Center.)

Harmful algal blooms are a fact of life in the state and elsewhere, on rivers, ponds and other bodies of water. The blooms are defined as the excessive growth of microscopic cyanobacteria or blue-green algae in water that can cause harm to animals, people or the local ecology. A bloom may have a paint-like appearance, or look like a foam, mat or scum. The coloration may appear blue-green, green, yellow, white, brown, purple or red, and will often have an unpleasant odor. 

The harm to human and animal health caused by an algal bloom can range from minor symptoms, such as skin irritation and gastrointestinal irritation, to serious medical issues including death (although this is rare). Signs of cyanotoxin poisoning depend on the type of toxin, toxin concentration, amount consumed, size of the individual and exposure route.

To assist Arkansans in recognizing, understanding and treating harmful algal blooms, the University of Arkansas System Division of Agriculture has developed a concise fact sheet, available online at The fact sheet will be available at Cooperative Extension Service offices throughout the state in August. 

John Pennington, extension water quality instructor and associate director of agriculture and natural resources for the Division of Agriculture, said that a work group composed of representatives from federal, state and local agencies, nonprofit organizations and municipalities developed the publication in response to increasing reports of harmful blooms in Arkansas. 

“With the increase in calls to county offices about reported and identified harmful algal blooms throughout the state, the UA water quality team wanted to develop a resource that would be helpful to the public in recognizing, understanding and treating them,” Pennington said.

Most recently, a bloom was confirmed in Lake Overcup in Morrilton, Ark. The Arkansas Game and Fish Commission, which manages the lake, issued a health advisory warning. 

While a harmful algal bloom will rarely contain toxins, it is capable of producing them and releasing them under certain conditions that are not yet completely known. 

Various factors, such as sunlight, weather patterns, and nitrogen and phosphorus in a water body are known to cause the blooms. Soil erosion, fertilizer and human and animal waste are common sources of nitrogen and phosphorus, although atmospheric nitrogen also plays a role. 

The blooms most often occur in summer and fall when the weather is warm and calm, as the blue green algae or cyanobacteria can migrate toward the optimal growing conditions near the water surface. 

The availability of the printed fact sheets was made possible thanks to financial support from Central Arkansas Water and Beaver Water District, the two largest water suppliers in Arkansas. 

To learn more about extension programs in Arkansas, contact your local Cooperative Extension Service agent or visit Follow us on Twitter at @UAEX_edu


About the Division of Agriculture

The University of Arkansas System Division of Agriculture’s mission is to strengthen agriculture, communities, and families by connecting trusted research to the adoption of best practices. Through the Agricultural Experiment Station and the Cooperative Extension Service, the Division of Agriculture conducts research and extension work within the nation’s historic land grant education system.  

The Division of Agriculture is one of 20 entities within the University of Arkansas System. It has offices in all 75 counties in Arkansas and faculty on five system campuses.   

The University of Arkansas System Division of Agriculture offers all its Extension and Research programs to all eligible persons without regard to race, color, sex, gender identity, sexual orientation, national origin, religion, age, disability, marital or veteran status, genetic information, or any other legally protected status, and is an Affirmative Action/Equal Opportunity Employer.

# # #

Media contact:
Ryan McGeeney
Communications Services
University of Arkansas System Division of Agriculture
Cooperative Extension Service
(501) 671-2120