For Immediate Release: July 24, 2026

Harmful algal blooms (HABs) are present on Hebgen Reservoir in the Corey Springs area of the Grayling Arm. Routine monitoring of Hebgen has confirmed the presence of anatoxin-a which poses a risk to people, pets, and livestock.

Read the full press release here. 

Toxin exposure can occur in humans from recreational activities where water might be ingested such as swimming, wind surfing, jet skiing, and water skiing. Children and pets are more likely to ingest HAB infested water because they spend most of their time wading in the shallow waters where algae can accumulate and they have less control over how much water they ingest. Animals and livestock that drink large amounts of contaminated water, and pets that collect scum on their fur and then ingest it by licking, are at high risk of toxin exposure.