Florida
Toxic algae in Marion County lakes
10 lakes and waterways in Marion County have harmful algal bloom reports in Florida's official data. The most recent entry is for Lake Weir: Florida's most recent sample from Lake Weir, on 28 July 2025 at Lake Weir - Hope Boat Ramp, found a bloom and no microcystin toxin was detected. Lake Weir has 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.
- Center Of Lake Weir 2019
- Lake Eaton 2023
- Lake Ocklawaha 2019
- Rainbow River 2019
- Salt Run Inside 2019
- Salt Run Mouth 2019
- Salt Springs 2022
- Silver River 2025
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.