Lake Alert for Lake Ivanhoe

May 26, 2022

UPDATED Information- A Lake Alert for Lake Ivanhoe was issued on April 27, 2022, due to a potentially unsafe concentration of toxins present in the lake. City of Orlando Stormwater staff have been continuously working with Florida Department of Environmental Protection 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 Florida Department of Environmental staff on May 12, 2022, which can be found here: indicate there are no toxins present in the lake at this time. However, out of a preponderance of caution, the City is electing to keep the Lake Alert in effect to ensure the bloom subsides and the lake does not produce additional toxins. Lake Ivanhoe will continue to be closely monitored by City of Orlando and FDEP staff. The Lake was sampled again on May 26, 2022, and, once we receive the results, the City of Orlando will provide another update. At this time, the Lake Alert 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, will also have the latest information. _______________________________________________________________________________

On April 27, 2022, the City of Orlando stormwater staff tested water samples from Lake Ivanhoe 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 Ivanhoe 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. Due to this, the city will work closely with Florida Department of Environmental Protection (FDEP) to closely monitor Lake Ivanhoe. The city staff will continue to routinely test the lake, but the city's tests will only provide an update on the presence of toxins. 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 so they too will get important information about Lake Ivanhoe 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.

We have attached a link for additional information:

If you should have additional questions, please email Kari Lara-Murabito at

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