An edition of: WaterAtlas.orgPresented By: Orange County, USF Water Institute

Water-Related News

UPDATE: Health Caution EXTENDED for Lake Mann

FDOH logo

September 12, 2022

The Florida Department of Environmental Protection (FDEP) recently tested follow-up water samples collected from Lake Mann near the Gilbert McQueen boat ramp. It was determined that potentially unsafe concentrations of toxins are still present in the lake. As a precaution, we are advising everyone to continue to refrain from swimming, recreating and irrigating in/from Lake Mann until further notice.


Original notices follow:

August 23, 2022

UPDATED Information - The Florida Department of Health (FDOH) in Orange County has extended a Health Caution for the presence of blue-green algae in Lake Mann. This is in response to a site visit and water sample taken by the Florida Department of Environmental Protection (FDEP) on August 16, 2022. The public should exercise caution in and around Lake Mann.

The official toxin determination is obtained from FDEP's data, and until the levels are deemed safe by state standards, the Lake Caution will remain in effect as per FDOH. Find current information about Florida’s water quality status and public health notifications for harmful algal blooms by visiting ProtectingFloridaTogether.gov

To report a bloom to FDEP, call the toll-free hotline at 855.305.3903.


August 16, 2022

ORLANDO – The Florida Department of Health in Orange County has issued a Health Caution for the presence of blue-green algae in Lake Mann. This is in response to a site visit and water sample taken by Florida Department of Environmental Protection on August 16, 2022. The public should exercise caution in and around Lake Mann.

Residents and visitors are advised to take the following precautions:

  • You should not drink, swim, wade, use personal watercraft, water ski or boat in waters where there is a visible bloom.
  • Avoid getting water in your eyes, nose, or mouth
  • You should keep pets and livestock away from the waters in this location
  • Eating fillets from healthy fish caught in freshwater lakes experiencing blooms is safe. Rinse fish fillets with tap or bottled water, throw out the guts and cook fish well.
  • You should not eat shellfish from this location

What is blue-green algae?

Blue-green algae are a type of bacteria that is common in Florida’s freshwater environments. A bloom occurs when rapid growth of algae leads to an accumulation of individual cells that discolor water and often produce floating mats that emit unpleasant odors.

Some environmental factors that contribute to blue-green algae blooms are sunny days, warm water temperatures, still water conditions and excess nutrients. Blooms can appear year-round but are more frequent in summer and fall. Many types of blue-green algae can produce toxins.

Is it harmful?

Blue-green algae blooms can impact human health and ecosystems, including fish and other aquatic animals. For additional information on potential health effects of algal blooms, visit floridahealth.gov/environmental-health/aquatic-toxins.

Find current information about Florida’s water quality status and public health notifications for harmful algal blooms and beach conditions by visiting ProtectingFloridaTogether.gov. Protecting Florida Together is the state’s joint effort to provide statewide water quality information to prioritize environmental transparency and commitment to action.

What do I do if I see an algal bloom?

The Florida Department of Environmental Protection (FDEP) collects and analyzes algal bloom samples. To report a bloom to FDEP, call the toll-free hotline at 855-305-3903 or report online.

To report fish kills, contact the Florida Fish and Wildlife Research Institute at 1-800-636-0511.

Report symptoms from exposure to a harmful algal bloom or any aquatic toxin to the Florida Poison Information Center, call 1-800-222-1222 to speak to a poison specialist immediately.

Contact your veterinarian if you believe your pet has become ill after consuming or having contact with blue-green algae contaminated water.

If you have other health questions or concerns about blue-green algae blooms, please call the Florida Department of Health in Orange County Algal Bloom Information Line at 407-723-5216.