Toxic algae detected at Barking Springs in Austin following dog death

The department is now recommending that people and pets avoid areas such as Barking Springs that are “known to have harmful algae." People should also not swim in the area due to high E. coli bacteria levels likely from the presence of many dogs, Lott said.

“If you do take your pets or go there yourself, avoid the algae mats; don’t drink the water; and rinse off afterwards,” Lott said.

With recording-breaking hot temperatures and a drought underway, conditions are ripe for harmful algae, according to the department. Warm water with low flow and high nutrient levels allow blue-green algae or cyanobacteria to produce toxins dangerous to the health of humans and pets.

While rapidly flowing water through the area makes Barking Springs a less likely host for a toxic bloom, the harmful algae was discovered “in pockets of still water outside of the main path of the water” where toxins are more likely to form, Lott said.

The department is warning that harmful algae may be found in any body of water at any time. Warm, stagnant, scum- or algae-filled water should be avoided as well as water where it has rained in the last three days or areas where many dogs are present, the department said.

People and pets should avoid drinking from natural bodies of water and contact with algae and should rinse off after swimming and not allow their dogs to lick their fur before.

Earlier this summer, toxins were detected June 27 in Lady Bird Lake at Red Bud Isle, Auditorium Shores and Festival Beach and at Emma Long Metropolitan Park along Lake Austin on June 29.

To stop the spread of harmful algae, the department spent $300,000 to apply Phoslock treatment at Red Bud Isle and Lady Bird Lake’s north shore, from I-35 to Festival Beach in mid-June. However, the department said that Phoslock treatment would not be appropriate for Barking Springs.

“It is most effective in lakes or ponds. It would be washed away at Barking Springs or other creek settings,” Lott said. “Mainly, we would like people to be aware that harmful algae can be present at this location and other natural waterways, so they can make informed choices.”

Test results from “Barking Springs”: the sampled algae mats tested positive for Dihydroanatoxin-a, a potent neurotoxin. The water tested negative, which means as long as the toxins are only in the algae, exposure to the toxin would happen by handling or ingesting the algae. (1/2) pic.twitter.com/35kZN4i1Yy

— Watershed Protection (@AustinWatershed) July 22, 2022