RICHMOND, Va. (WSET) -- The Virginia Department of Health has issued a harmful algae bloom advisory for upper and middle Pamunkey as well as Middle and Lower North Anna Branches of Lake Anna.
The areas are experiencing a harmful algae bloom.
The VDH said the public is advised to avoid contact with the lake in these areas until algae concentrations return to acceptable levels.
Some harmful algae, called cyanobacteria, can cause skin rash and gastrointestinal illnesses, such as upset stomach, nausea, vomiting and diarrhea.
To see the exact areas, you can check out an interactive map.
Routine monitoring occurs monthly above Route 208 on Lake Anna, the VDH said. Test results indicate samples collected July 10 at sites within these areas contained potentially harmful algae (cyanobacteria) which exceed safe swimming levels. People and pets are advised to avoid swimming, windsurfing and stand-up-paddle-boarding as well as other activities which pose a risk of ingesting water or exposure to skin. Advisory signs will be posted in areas of the lake.
Swimming advisories have been issued for the following areas of the lake:
Pamunkey Branch
North Anna Branch:
Algae blooms can occur when warm water and nutrients combine to make conditions favorable for algae growth. Most algae species are harmless; however, some species may produce irritating compounds or toxins. Avoid discolored water or scums that are green or blueish-green because they are more likely to contain toxins.
To prevent illness, people should: