Subscribe to Weekly Updates

Current Weekly Update

July 25-July 31 — There were 20 reported site visits in the past seven days with 20 samples collected. Algal bloom conditions were observed by samplers at 14 of the sites.

The satellite imagery for Lake Okeechobee from 7/31 shows low to moderate bloom potential on approximately 75% of the lake, with the highest potential in the northern and south-central portions of the lake.

The satellite imagery for the Caloosahatchee Estuary from 7/31 is partially obscured by cloud cover and shows no significant bloom potential on visible portions of the estuary.

The satellite imagery for the St. Lucie Estuary from 7/31 is partially obscured by cloud cover and shows no significant bloom potential on visible portions of the estuary.

The satellite imagery for the St. Johns River from 7/31 is partially obscured by cloud cover and shows moderate bloom potential throughout most of Lake George and Doctors Lake. Low to moderate bloom potential is visible on the mainstem of the St. Johns River downstream to Jacksonville, Florida.

Please keep in mind that bloom potential is subject to change due to rapidly changing environmental conditions or satellite inconsistencies (i.e., wind, rain, temperature or stage).

On 7/28-7/30, Florida Department of Environmental Protection (DEP) staff collected 10 Harmful Algal Bloom (HAB) response samples. Dominant algal taxa and cyanotoxin results follow each waterbody name.

Lake Odell — East Shore: Microcystis aeruginosa; no cyanotoxins detected.

Lake Olivia — Southwest Shore: No dominant algal taxon; 0.42 parts per billion (ppb) of cylindrospermopsin detected.

Silver River — Near Fort King Paddle Trail: Water sample had no dominant algal taxon and algal mat sample dominated by Lyngbya-like cyanobacteria; no cyanotoxins detected.

Doctors Lake — Pace Island Back Park Dock: Dolichospermum circinale; trace level (0.55 ppb) of microcystins detected.

Doctors Lake — Center: Microcystis aeruginosa and Dolichospermum circinale co-dominant; trace level (0.53 ppb) of microcystins detected.

Doctors Lake — 1915 Salt Myrtle Lane: Microcystis aeruginosa and Dolichospermum circinale co-dominant; trace level (0.53 ppb) of microcystins detected.

Lake Okeechobee — S308C (lakeside): No dominant algal taxon; trace level (0.14 ppb) of cylindrospermopsin detected.

C44 canal — S308C: No dominant algal taxon; no cyanotoxins detected.

Lake Thonotosassa — Center: Microcystis aeruginosa and Planktolyngbya limnetica co-dominant; trace level (0.71 ppb) of microcystins detected.

Lake Lafayette — North Center: Coelastrum sp.; no cyanotoxins detected.

On 7/30, South Florida Water Management District staff collected two HAB response samples. Dominant algal taxa and cyanotoxin results follow each waterbody name.

Lake Okeechobee — S352: Microcystis aeruginosa; trace level (0.16 ppb) of cylindrospermopsin detected.

L10 Canal — S352: Planktolyngbya limnetica; no cyanotoxins detected.

On 7/28–7/30, St. Johns River Water Management District staff collected two routine HAB monitoring samples and six response samples. Dominant algal taxa and cyanotoxin results follow each waterbody name.

Lake George — Center: Microcystis aeruginosa and Raphidiopsis raciborskii co-dominant; 0.60 ppb of cylindrospermopsin detected.

Lake Yale — South: Raphidiopsis raciborskii and Botryococcus braunii co-dominant; no cyanotoxins detected.

Lake Weir — Hope Boat Ramp: Raphidiopsis raciborskii and Botryococcus braunii co-dominant; no cyanotoxins detected.

St. Johns River — South of HWY 17: Microcystis aeruginosa and Raphidiopsis raciborskii co-dominant; 0.44 ppb of cylindrospermopsin detected.

Lake Apopka — Northwest of Center: Microcystis aeruginosa and Planktolyngbya contorta were co-dominant; no cyanotoxins detected.

Dead Lake — Bull Creek Boat Ramp: Microcystis aeruginosa; trace level (0.15 ppb) of cylindrospermopsin and 2.5 ppb of microcystins detected.

Dead Lake — South Cove: Microcystis aeruginosa; trace levels of cylindrospermopsin and microcystins (0.17 ppb and 0.95 ppb, respectively) detected.

Lake Washington — Center: Results pending.

Results for completed analyses are available at FloridaDEP.gov/AlgalBloom. 

This is a high-level summary of the sampling events for the reported week. For all field visit and analytical result details, please refer to the complete algal bloom map with data table by clicking the “Field and Lab Details” Quick Link from the Algal Bloom Dashboard. Different types of blue-green algal bloom species can look different and have different impacts. However, regardless of species, many types of blue-green algae can produce toxins that can make you or your pets sick if swallowed or possibly cause skin and/or eye irritation due to contact. We advise staying out of water where algae is visibly present as specks or mats or where water is discolored pea-green, blue-green or brownish-red. Additionally, pets or livestock should not come into contact with algal bloom-impacted water or with algal bloom material or fish on the shoreline.

Weekly Update Archive

 

Last Modified: Friday, Aug 01, 2025 - 04:56pm