Florida
Toxic algae in St. Johns County lakes
6 lakes and waterways in St. Johns County have harmful algal bloom reports in Florida's official data. The most recent entry is for Trout Creek: Florida's most recent sample from Trout Creek, on 8 September 2022 at Trout Creek - Trout Creek Park Boat Ramp, found no visible bloom and no microcystin toxin was detected.
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.
- Atlantic Intercoastal Waterway 2023
- Bird Island Pond 2017
- Guana Lake 2022
- Lake Ponte Vedra--Guana Lake 2019
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.