Florida
Toxic algae in Seminole County lakes
20 lakes and waterways in Seminole County have harmful algal bloom reports in Florida's official data. The most recent entry is for Lake Jesup: Florida's most recent sample from Lake Jesup, on 16 December 2025 at Lake Jesup - Center (OW-CTR), found no visible bloom and no microcystin toxin was detected. Lake Jesup, Lake Howell and Deep Lake have had blooms in three or more years.
Lakes with bloom history
Newest report first. Each lake has its own page with the full history and what the results mean.
Other waterbodies with a report
These have one or two reports in a single year, which isn't enough history for a page of their own yet.
- Chari Lake 2024
- East Lake 2025
- Gee Creek 2023
- Lake Ellen 2024
- Lake Grace--Scum 2019
- Lake Mills 2018
- Lake Minnie 2025
- Lake Pot 2019
- Soldier Creek 2021
Source: Florida Department of Environmental Protection (DEP), official data, checked 24 October 2026. For today's conditions see the DEP Algal Bloom Dashboard. No report doesn't mean a lake is safe: most water is only tested occasionally.