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Aug. 15-Aug. 21 — There were 54 reported site visits in the past seven days with 54 samples collected. Algal bloom conditions were observed by samplers at 13 of the sites.

The best available satellite imagery for Lake Okeechobee from 8/21 shows low to high bloom potential on approximately 55% of the lake, with the largest area of high bloom potential along the western shore of the lake.

The best available satellite imagery for the Caloosahatchee Estuary from 8/19 is partially obscured by cloud cover and shows no significant bloom potential on visible portions of the estuary.

The best available satellite imagery for the St. Lucie Estuary from 8/21 is partially obscured by cloud cover and shows no significant bloom potential on visible portions of the estuary.

The best available satellite imagery for the St. Johns River from 8/21 shows moderate bloom potential throughout the northern 3/4 of Lake George. Moderate bloom potential is visible on the mainstem of the St. Johns River from Lake George downstream to Palatka, Florida and on Doctors Lake.

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 8/18-8/21 Florida Department of Environmental Protection (DEP) staff collected 13 Harmful Algal Bloom (HAB) response samples. Dominant algal taxa and cyanotoxin results follow each waterbody name.

Caloosahatchee River — Miramar Canal: No dominant algal taxon; no cyanotoxins detected.

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

Silver Glen Springs — Northeast of Juniper Club: Raphidiopsis raciborskii and Planktolyngbya limnetica co-dominant; trace level [0.19 parts per billion (ppb)] of cylindrospermopsin detected.

Veterans Memorial Park Pond: Microcystis aeruginosa and Microcystis wesenbergii co-dominant; 3.5 ppb of microcystins detected.

Dead Lake — South Cove: Microcystis aeruginosa; no cyanotoxins detected.

Bull Creek — near boat ramp: No dominant algal taxon; no cyanotoxins detected.

St. Johns River — Buzzard Island: Microcystis aeruginosa and Raphidiopsis raciborskii co-dominant; 0.42 ppb of cylindrospermopsin detected.

Johns Lake — West of Scrub Point Preserve: No dominant algal taxon; no cyanotoxins detected.

St. Johns River — East of NAS JAX: Results pending.

Lake Jackson — Rhoden Cove: Microcystis sp.; no cyanotoxins detected.

Goodbye’s Creek — West of San Jose Blvd: Results pending.

St. Johns River — Inwood Terrance: Results pending.

St. Johns River — Fuller Warren Bridge: Results pending.

On 8/18–8/20, South Florida Water Management District staff collected 34 routine HAB monitoring samples on the C43 Canal, C44 Canal and Lake Okeechobee and two HAB response samples at L8 Canal — CULV10A and Lake Okeechobee — S352 (lakeside). Dominant algal taxa and cyanotoxin results follow each waterbody name.

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

C44 canal — S80 (upstream): Microcystis aeruginosa and Planktothrix agardhi co-dominant; no cyanotoxins detected.

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

Lake Okeechobee — S308C (lakeside): Microcystis aeruginosa and Planktolyngbya limnetica co-dominant; trace levels (0.27 ppb and 0.25 ppb) of microcystins and cylindrospermopsin, respectively.

Lake Okeechobee — S352: Microcystis aeruginosa and Planktolyngbya limnetica co-dominant; trace level (0.18 ppb) of cylindrospermopsin detected.

L8 Canal — CULV10A: Microcystis aeruginosa; trace level (0.13 ppb) of cylindrospermopsin detected.

FEBIN: No dominant algal taxon; no cyanotoxins detected.

FEBOUT: Dolichospermum circinale; no cyanotoxins detected.

KISSR0.0: Microcystis aeruginosa; no cyanotoxins detected.

LZ2: Raphidiopsis raciborskii; trace level (0.17 ppb) of cylindrospermopsin detected.

NES191: Raphidiopsis raciborskii; trace level (0.24 ppb) of cylindrospermopsin detected.

L001: Microcystis aeruginosa and Raphidiopsis raciborskii co-dominant; trace level (0.32 ppb) of cylindrospermopsin detected.

NES135: Microcystis aeruginosa and Raphidiopsis raciborskii co-dominant; trace levels (0.27 ppb and 0.38 ppb) of microcystins and cylindrospermopsin, respectively.

NCENTER: Microcystis aeruginosa and Raphidiopsis raciborskii co-dominant; trace levels (0.64 ppb and 0.28 ppb) of microcystins and cylindrospermopsin, respectively.

EASTSHORE: Microcystis aeruginosa and Raphidiopsis raciborskii co-dominant; trace levels (0.27 ppb and 0.34 ppb) of microcystins and cylindrospermopsin, respectively.

L004: Microcystis aeruginosa; trace level (0.78 ppb) of microcystins detected.

L008: Dolichospermum circinale; no cyanotoxins detected.

L005: Dolichospermum circinale; trace level (0.11 ppb) of cylindrospermopsin detected.

POLESOUT3: Microcystis aeruginosa and Dolichospermum circinale co-dominant; no cyanotoxins detected.

POLESOUT2: Microcystis aeruginosa and Dolichospermum circinale co-dominant; trace level (0.10 ppb) of cylindrospermopsin detected.

POLESOUT1: Microcystis aeruginosa and Planktolyngbya limnetica co-dominant; trace level (0.16 ppb) of cylindrospermopsin detected.

POLESOUT: Microcystis aeruginosa and Raphidiopsis raciborskii co-dominant; trace level (0.14 ppb) of cylindrospermopsin detected.

KBARSE: Microcystis aeruginosa and Planktolyngbya limnetica co-dominant; trace levels (0.60 ppb and 0.22 ppb) of microcystins and cylindrospermopsin, respectively.

CLV10A: Microcystis aeruginosa and Planktolyngbya limnetica co-dominant; trace levels (0.42 ppb and 0.25 ppb) of microcystins and cylindrospermopsin, respectively.

LZ40: Microcystis aeruginosa; 2.4 ppb of microcystins detected.

L006: Microcystis aeruginosa; no cyanotoxins detected.

PALMOUT3: Microcystis aeruginosa; trace level (0.53 ppb) of microcystins detected.

PALMOUT2: Microcystis aeruginosa; no cyanotoxins detected.

PALMOUT1: Dolichospermum circinale; trace level (0.13 ppb) of cylindrospermopsin detected.

PALMOUT: No dominant algal taxon; 1.0 ppb of cylindrospermopsin detected.

LZ30: Microcystis aeruginosa; no cyanotoxins detected.

POLE3S: Microcystis aeruginosa; 0.78 ppb of cylindrospermopsin detected.

RITTAE2: No dominant algal taxon; 1.5 ppb of cylindrospermopsin detected.

LZ25A: Microcystis aeruginosa; no cyanotoxins detected.

L007: Microcystis aeruginosa; no cyanotoxins detected.

PELBAY3: Dolichospermum circinale; no cyanotoxins detected.

On 8/18–8/21, St. Johns River Water Management District (SJRWMD) staff collected three routine HAB monitoring samples and two response samples. Dominant algal taxa and cyanotoxin results follow each waterbody name.

Newnans Lake — Center: Microcystis aeruginosa and Planktolyngbya contorta co-dominant; trace level (0.15 ppb) of microcystins detected.

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

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

Lochloosa Lake — Center: Microcystis aeruginosa and Planktolyngbya contorta co-dominant; no cyanotoxins detected.

Lake Washington — Center: Results pending.

Last week

On 8/14 DEP staff collected three Harmful Algal Bloom (HAB) response samples. Dominant algal taxa and cyanotoxin results follow each waterbody name.

Lake Jackson — Rhoden Cove: Microcystis sp.; no cyanotoxins were detected.

Doctors Lake — Pace Island Dock: Microcystis aeruginosa and Dolichospermum circinale co-dominant; trace level (0.58 ppb) of microcystins detected.

Doctors Lake — Salt Myrtle Lane: Microcystis aeruginosa; trace level (0.60 ppb) of microcystins detected.

On 8/14, SJRWMD staff collected two routine HAB monitoring samples Dominant algal taxa and cyanotoxin results follow each waterbody name.

Blue Cypress Lake — Center: Microcystis aeruginosa and Dinophyceae co-dominant; no cyanotoxins were detected.

Stick Marsh — North: 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, Aug 22, 2025 - 03:57pm