The Virginia Department of Health is warning swimmers of a harmful algal bloom(HAB) in part of Smith Mountain Lake. The Blackwater area of Smith Mountain Lake, which includes parts of Pittsylvania, Franklin, and Bedford counties has had reports of discolored water and scum on the water surface.

The VDH is urging swimmers to avoid contact in the vicinity of scum. Children and pets are most vulnerable to harmful algal blooms.

HABs are dangerous to fish because they can deplete oxygen in water. When oxygen levels become too low, fish suffocate and die. Some algae species in blooms produce toxins that can kill fish and cause illness in humans.

The areas within the Blackwater River arm of Smith Mountain Lake where samples were collected:
Blackwater River
•Unnamed Creek cove; Blackwater River at Kemp Ford Road
•Blackwater River cove at Virginia Key Trail
•Blackwater River cove near Anthony Ford Landing
Algal blooms can occur when warm water and nutrients combine to make conditions favorable for algal growth. Most algal species are harmless. However, some species may produce irritating compounds or toxins. Avoid discolored water or scums that are green or bluish-green because they are more likely to contain toxins.

The VDH is lake goers to keep children and pets out of the water if there is any doubt about the quality of the water.