Toxic algae in Seminole County, Florida
20 lakes and waterways have harmful algal bloom reports in Florida's official data.
Lakes with bloom history
| Lake | Years with reports | Most recent |
|---|---|---|
| Lake Jesup | 6 | 2025 |
| Lake Howell | 5 | 2025 |
| Deep Lake | 3 | 2024 |
| Lake Dot | 1 | 2022 |
| Lake Griffin | 1 | 2022 |
| Lake Kathryn | 1 | 2022 |
| Little Big Econ River | 2 | 2025 |
| Wood Lake | 1 | 2023 |
| Lake Grace | 2 | 2020 |
| St Johns River | 2 | 2025 |
| Little Econ River | 2 | 2025 |
Other waterbodies with a report
These have one or two reports in a single year, so there 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. For current conditions see the DEP Algal Bloom Dashboard.