June 14, 2022
UPDATED Information – A Lake Alert was issued for Lake Mann on March 23, 2022 due to potentially unsafe concentrations of toxins present in the lake. City of Orlando Stormwater staff have been continuously working with Florida Department of Environmental Protection (FDEP) on monitoring and sampling Lake Mann since the Lake Alert was issued. This message is to provide an update on the status of the lake.
The results from the latest sampling event performed by FDEP staff on May 26, 2022, which can be found here: floridadep.gov/AlgalBloom, indicate there are no toxins present in the lake, but a bloom is still present. As a cautionary measure, the City is electing to keep a Lake Caution in effect to ensure the bloom subsides and the lake does not produce additional toxins. Lake Mann was sampled again by FDEP on June 13, 2022. The City of Orlando will provide another update when we receive the results from this sampling event. At this time, the Lake Caution remains in effect until further notice.
Please continue to call the Lake Alert number, 407.246.2220, for the most up-to-date information regarding your lake. During weekdays, the City's Lake Alert website, orlando.gov/lakealert will also have the latest information.
On March 23, 2022, the Florida Department of Environmental Protection (FDEP) tested water samples from Lake Mann, taken by the Gilbert McQueen boat ramp, and determined that potentially unsafe concentrations of toxins are present in the lake. As a precaution, we are advising everyone to refrain from swimming, recreating and irrigating in/from Lake Mann until further notice.
For reference, cyanobacteria/blue-green algae are always present in the water, however, not all bacteria have the ability to produce toxins. Toxicity is hard to predict because a single species of algae can have toxic and non-toxic strains. Nothing can be done to treat algae blooms without causing massive fish kills. In the coming weeks, the city will work closely with Florida Department of Environmental Protection (FDEP) to monitor Lake Mann. Once we obtain more information on the status of the lake, we will continue to update this Lake Alert.
Please encourage your neighbors to register for the Lake Alert at orlando.gov/lakealert so they too will get important information about Lake Mann directly.
In the meantime, as we stated above, the city would advise refraining from swimming, recreating and irrigating in/from the lake until further notice.