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Oct. 24–Oct. 30 — There were 17 reported site visits in the past seven days with 17 samples collected. Algal bloom conditions were observed by samplers at five of the sites.

The satellite imagery for Lake Okeechobee from 10/30 is partially obscured by cloud cover and shows low to medium bloom potential on approximately 25% of the lake. The highest bloom potential is in southwest portion of the lake.

The best available satellite imagery for the Caloosahatchee River from 10/29 is partially obscured by cloud cover and shows no significant bloom potential on visible portions of the river and estuary.

The satellite imagery for St. Lucie River from 10/30 is partially obscured by cloud cover and shows highly scattered low bloom potential.

The satellite imagery for St. Johns River from 10/30 shows scattered low to moderate bloom potential on Lake George downstream to the city of Jacksonville.

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 10/28–10/29, Florida Department of Environmental Protection staff collected three Harmful Algal Bloom (HAB) response samples. Dominant algal taxa and cyanotoxin results follow each waterbody name.

Veterans Memorial Park Pond: Microcystis aeruginosa and Microcystis wesenbergii co-dominant; 1.9 ppb microcystins detected.

Kell-Aire Lake: Microcystis aeruginosa and Planktolyngbya limnetica co-dominant; trace level (0.82 ppb) microcystins detected.

Lake Bessie — North Shore: Microcystis panniformis dominant in the water sample and Scytonema arcangeli i dominant in the algal mat sample; no cyanotoxins detected.

On 10/27, South Florida Water Management District staff collected five HAB response samples. Dominant algal taxa and cyanotoxin results follow each waterbody name.

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

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

C43 Canal — S77 (upstream): No dominant algal taxon; no cyanotoxins detected.

Lake Okeechobee — Pahokee Marina: No dominant algal taxon; trace level [0.12 parts per billion (ppb)] of cylindrospermopsin detected.

Lake Okeechobee — S354: Microcystis aeruginosa and Dolichospermum circinale co-dominant; no cyanotoxins detected.

On 10/10/27 and 10/29, St. Johns River Water Management District (SJRWMD) staff collected one HAB response sample and eight routine HAB monitoring samples. Dominant algal taxa and cyanotoxin results follow each waterbody name.

Three Forks Marsh Conservation Area — East Canal: Planktothrix agardhii; no cyanotoxins detected.

St. Johns River — Mandarin Point: No dominant algal taxon; no cyanotoxins detected.

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

St. Johns River — Shands Bridge: Microcystis aeruginosa; no cyanotoxins detected.

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

Lake George — Center: Microcystis aeruginosa ; no cyanotoxins detected.

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

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

Lake Washington — Center: Results pending.

Last week

On 10/23, SJRWMD collected one HAB response sample at St. Johns River — Buzzard Island. The sample was co-dominated by Microcystis wesenbergii and Raphidiopsis raciborskii; no cyanotoxins were 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 31, 2025 - 03:38pm