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Oct. 17-Oct. 23, 2025 — There were 17 reported site visits in the past seven days with 17 samples collected. Algal bloom conditions were observed by samplers at nine of the sites.

The satellite imagery for Lake Okeechobee from 10/23 is partially obscured by cloud cover and shows low to medium bloom potential on approximately 40% of the lake. The highest bloom potential is in southwest portion of the lake.

The best available satellite imagery for the Caloosahatchee River from 10/22 is partially obscured by cloud cover and shows scattered low bloom potential on visible portions of the upper estuary.

The best available satellite imagery for St. Lucie River from 10/22 is partially obscured by cloud cover and shows highly scattered low bloom potential.

The best available satellite imagery for St. Johns River from 10/22 shows scattered low to moderate bloom potential on Lake George downstream to the Arlington River.

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 10/20–10/23, Florida Department of Environmental Protection staff collected 11 Harmful Algal Bloom (HAB) response samples. Dominant algal taxa and cyanotoxin results follow each waterbody name.

Thomas Lake — Center: Microcystis aeruginosa and Raphidiopsis raciborskii co-dominant; no cyanotoxins detected.

Lake Summit — at Boat Ramp: Microcystis aeruginosa; trace level [0.11 parts per billion (ppb)] of cylindrospermopsin detected.

Lake Okeechobee — S308C (lakeside): No dominant algal taxon; no cyanotoxins detected.

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

Lake Echo — Northwest: Microcystis aeruginosa; 1.1 ppb cylindrospermopsin detected

Lake Crago — by Boat Ramp: Microcystis wesenbergii; no cyanotoxins detected.

Lake Thonotosassa — Center: Dolichospermum circinale and Planktolyngbya limnetica co-dominant; trace level (0.88 ppb) of cylindrospermopsin detected.

Veterans Memorial Park Pond: Planktolyngbya limnetica and Planktolyngbya contorta co-dominant; 2.2 ppb microcystins detected.

Kell-Aire Lake: Microcystis aeruginosa and Raphidiopsis raciborskii co-dominant; trace level (0.80 ppb) microcystins detected.

Lowry Park Spring: No dominant algal taxon; no cyanotoxins detected.

St. Johns River — Buzzard Island: Results pending.

On 10/22, South Florida Water Management District staff collected three HAB response samples. Dominant algal taxa and cyanotoxin results follow each waterbody name.
 

Lake Okeechobee — S352: No dominant algal taxon; no cyanotoxins detected.

Lake Okeechobee — Pahokee Marina: No dominant algal taxon; trace level (0.11 ppb) of cylindrospermopsin detected.

Lake Okeechobee — S354: Microcystis aeruginosa and Dinophyceae co-dominant; 15 ppb microcystins and a trace level (0.15 ppb) of cylindrospermopsin detected.

On 10/21, St. Johns River Water Management District (SJRWMD) staff collected three routine HAB monitoring samples. Dominant algal taxa and cyanotoxin results follow each waterbody name.
 

Lake Washington — Center: No dominant algal taxon; no cyanotoxins detected.

Lake Jesup — Center: Microcystis aeruginosa and Raphidiopsis raciborskii co-dominant; trace level (0.11 ppb) of cylindrospermopsin detected.

Lake Monroe — Center: No dominant algal taxon; no cyanotoxins detected.
 

Last week


On 10/16, SJRWMD staff collected three HAB response samples. Dominant algal taxa and cyanotoxin results follow each waterbody name.

Blue Cypress Lake — Center: Microcystis aeruginosa; no cyanotoxins detected.

Stick Marsh — North: No dominant algal taxon; no cyanotoxins detected.

Crescent Lake — mouth of Dunns Creek: No dominant algal taxon; no cyanotoxins detected.

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.

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Last Modified: Friday, Oct 24, 2025 - 05:21pm