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

Water-Related News

UPDATE: Health Alert EXTENDED for Lake Estelle

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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:

Sept. 2, 2022: Recent lab results from a sample collected at Lake Estelle indicate the presence of algae capable of producing toxins in the water column.

As a result, Lake Estelle will continue to be closely monitored by the Florida Department of Environmental Protection (FDEP) staff. The FDEP will collect follow-up samples for analysis in 2-3 weeks, and will provide updates on any possible detection of algae toxins as reported on the FDEP Algal Bloom Reporting dashboard (https://floridadep.gov/AlgalBloom).

Please continue to refrain from irrigating or recreating on the lake, including swimming, fishing and boating until further notice.


The Florida Department of Health in Orange County (FDOH) has issued a Health Alert for the presence of harmful blue-green algal toxins in Lake Estelle. This is in response to a water sample taken on 8/8/22 from the Florida Department of Environmental Protection (FDEP). The public should exercise caution in and around Lake Estelle. Please refrain from irrigating or recreating on the lake, including swimming, fishing and boating until further notice.

Algae are always present in water, however, not all algae produce toxins. Algae are most common in Florida during the summer and early fall, due to high temperatures and sunlight.

Recent lab results from a sample collected at Lake Estelle indicate the presence of algae toxins in the water column. As a result, Lake Estelle will be closely monitored by the Florida Department of Environmental Protection (FDEP) staff. The FDEP will collect follow-up samples for analysis at a future date (possibly 4-6 weeks) determined by the FDEP for Lake Estelle and will provide updates on any possible detection of algae toxins as reported on the FDEP Algal Bloom Reporting dashboard (https://floridadep.gov/AlgalBloom). 

The official toxin determination is obtained from FDEP's data, and until the levels are deemed safe by state standards, the Lake Alert 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 or report online here: https://floridadep.gov/AlgalBloom