Swimmers and other water sport enthusiasts are warned to avoid certain branches of Lake Anna because of a toxic algae bloom. The Middle Pamunkey Branch, Upper Pamunkey Branch, Terry’s Run and the Upper North Anna Branch of Lake Anna are all effected. The public is advised to avoid contact with the lake in these areas until algae concentrations return to acceptable levels, the Virginia Department of Health said in a news release. 

Water samples taken at collection sites within the aforementioned areas exceeded safe swimming levels of harmful algae, called cyanobacteria. Cyanobacteria can cause skin rash and gastrointestinal illnesses, such as an upset stomach, nausea, vomiting and diarrhea. People and pets are advised to avoid swimming, windsurfing and stand-up-paddle-boarding as well as other activities that pose a risk of ingesting water or exposure to skin, the news release said.

Algae blooms can occur when warm water and nutrients combine