UPDATE: Orlando lifts alert for Lake Sue
The Lake Alert for Lake Sue has been lifted. Please resume all normal water activities associated with the lake.
On January 21, 2021 the city took water samples in Lake Sue to determine the presence of cylindrospermopsin (toxins) resulting from an algae bloom in the lake. It was determined that potentially unsafe concentrations of toxins are present in Lake Sue. As a precaution, we are advising everyone to refrain from swimming, recreating and irrigating in/from Lake Sue 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. This instance is believed to have occurred due to the water in the lake "flipping." During the colder months, the warm surface water begins to cool. As water cools, it will become more dense, causing it to sink. This dense water forces the water of the bottom layer to rise, turning the layers over. The bottom layer tends to be very nutrient rich, then is exposed to sunlight at the surface level and causes an algae bloom to occur.
Nothing can be done to treat algae blooms without causing massive fish kills. Due to this, the city will work closely with Florida Department of Environmental Protection (FDEP) to closely monitor Lake Sue. The city staff will continue to routinely test the lake, but the city's tests will only provide an update on the presence of cylindrospermopsin. The official toxin determination is obtained from FDEP's laboratory data, and until the levels are deemed safe by state standards, the Lake Alert will remain in effect.
Please encourage your neighbors to register for the Lake Alert at orlando.gov/lakealert so they too will get important information about Lake Sue directly.
In the meantime, as we stated above, the city would advise refr
