Water samples taken at Lake Needwood and Lake Frank are being studied to determine if levels of blue-green algae are rising.
According to Montgomery Parks, signs of microcystin have been spotted, and patrons are urged to use caution at these lakes, which are located within Rock Creek Regional Park.
Discolored water and algal mats have been seen in portions of both lakes, according to Montgomery Parks.
Staff at the Maryland Department of Environment are currently evaluating water samples if see if the levels are harmful.
Harmful algal blooms can produce dangerous levels of toxic microcystin.
“As a precautionary measure, we are alerting the public of the risks associated with potentially high levels of cyanobacteria in these lakes,” said Matt Harper, natural resources manager with Montgomery Parks. “While we await the toxin testing results, we urge people to keep their dogs on leash and ensure they are not allowed contact with the water.”
Cyanobacteria are naturally occurring algae in the environment but can grow in excess and produce harmful toxins, including microcystin, a hepatotoxin. High concentrations of microcystin may harm humans and pets if ingested. Of primary concern are off-leash dogs that may swim and/or drink from the lake, despite park regulations, according to Montgomery Park officials.
When visiting the area, Montgomery Parks recommends:
- Avoid direct contact with water while boating or fishing; swimming is always prohibited in lakes
- Keep dogs on leash (per park regulations), and do not allow them to drink or be in contact with the water or algal mats accumulating on shorelines
- If your pet has been in contact with lake water or algae, rinse fur with clean water and seek veterinary care if you are concerned
- Wash hands thoroughly before eating, drinking, or smoking if you have come in contact with the water.“Signs have been posted around Lake Needwood and Lake Frank and along trails that access the lakes to ensure visitors are aware of the potential risk of elevated microcystin, and to urge visitors to take precautions,” said David Quintanilla, Rock Creek Regional Park manager.
