Is Trout River safe? Toxic algae status
Duval County, Florida. Harmful algal bloom (blue-green algae) reports from the Florida Department of Environmental Protection (DEP).
Data checked 24 October 2026. Florida data is published as a yearly file; current sampling is shown on the DEP dashboard.
3
sampling visits since 2021
2
visits where a bloom was seen
9.5 µg/L
highest microcystin result; 1 sample at or above the EPA swim level of 8 µg/L
Year by year
Each box shows visits where a bloom was seen, out of all sampling visits that year.
Recent reports
| Date | Location | Result |
|---|---|---|
| 14 October 2021 | Trout River - Bert Maxwell Boat Ramp | No bloom seen · microcystin not detected |
| 29 September 2021 | Trout River - Main St Bridge | Bloom seen · microcystin 0.76 µg/L |
| 29 September 2021 | Trout River - Bert Maxwell Boat Ramp | Bloom seen · microcystin 9.5 µg/L |
What the results mean
Staff saw a bloom at the sampling site. A sample may then be tested for toxins.
Microcystin, a liver toxin made by blue-green algae, was found in the sample.
At or above the level where the US EPA recommends swimming advisories for microcystins.
Dogs and toxic algae
Dogs face the greatest risk because they swallow water and lick algae off their fur. If a bloom has been reported, keep dogs out of the water and away from scum on the shore. If your dog swims in water that might have algae, rinse it with clean water straight away and call a vet if it seems unwell.
Common questions
Is Trout River safe to swim in?
The most recent entry in Florida's published data is from 14 October 2021: no bloom seen · microcystin not detected (Trout River - Bert Maxwell Boat Ramp). For current conditions, check the DEP Algal Bloom Dashboard and posted signs.
Source: Florida Department of Environmental Protection (DEP), official data. This page is independent and not affiliated with the State of Florida.