Florida
Toxic algae in Putnam County lakes
33 lakes and waterways in Putnam County have harmful algal bloom reports in Florida's official data. The most recent entry is for Georges Lake: Florida's most recent sample from Georges Lake, on 18 December 2025 at Georges Lake - East, found a bloom and microcystin toxin measured 24 µg/L, at or above the US EPA swimming advisory level of 8 µg/L. Georges Lake, Crescent Lake and St Johns River and 2 more 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.
- Georges Lake Toxins above EPA level
- Crescent Lake No bloom seen
- St Johns River No bloom seen
- Lake Grandin No bloom seen
- Dunns Creek Bloom seen
- Lake Winnott Bloom seen
- Rodman Reservoir Dam Bloom seen
- Violet Lake No bloom seen
- Welaka Springs Bloom seen
- St John's River No bloom seen
- Lake McMeekin Low toxin level
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.
- 100 Lake Drive Crescent Lake 2018
- Buffalo Bluff On St Johns River 2018
- Crescent Lake East Side 2017
- Darkwater Lake 2023
- Dunns Creek Canal 2020
- Fish Creek 2019
- Georges Lake Ne 2020
- Georgetown Canal 2023
- Lake Broward 2025
- Lake Lillie 2017
- Lake Myra 2021
- Lake Stella 2024
- Ne Lake Stella 2019
- North Shore Of Santa Fe Lake 2018
- Nw Side Of Crescent Lake 2019
- Ocklawaha River 2023
- Punchbowl Lake 2022
- Rodman Reservoir 2021
- Round Lake 2019
- St Johns River Channel Marker 2019
- Star Lake 2020
- Swan Lake 2023
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.