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Sept. 26-Oct. 2, 2025 — There were 47 reported site visits in the past seven days with 47 samples collected. Algal bloom conditions were observed by samplers at seven of the sites.

The satellite imagery for Lake Okeechobee from 10/2 is partially obscured by cloud cover and shows low to medium bloom potential on at least 40% of the lake. The highest bloom potential is southwest quadrant of the lake.

The satellite imagery for the Caloosahatchee Estuary from 10/2 is partially obscured by cloud cover and shows no bloom potential on visible portions of the estuary.

The best available satellite imagery for the St. Lucie Estuary from 9/29 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 9/28 shows low to moderate bloom potential on approximately 40% of Lake George and on Doctors Lake. Low to moderate bloom potential is visible on the mainstem of the St. Johns River from Lake George downstream to the Ortega 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 9/30–10/2, Florida Department of Environmental Protection (DEP) staff collected eight Harmful Algal Bloom (HAB) response samples. Dominant algal taxa and cyanotoxin results follow each waterbody name.

Doctors Lake — Pace Island dock: No dominant algal taxon; no cyanotoxins detected.
St. Johns River — Cummer Museum of Art: No dominant algal taxon; no cyanotoxins detected.
St. Johns River — Arlington Marina: No dominant algal taxon; no cyanotoxins detected.
Veterans Memorial Park Pond: Planktolyngbya limnetica and Planktolyngbya contorta co-dominant; 1.8 parts per billion (ppb) of microcystins detected.
Kell-Aire Lake: Microcystis aeruginosa and Planktolyngbya limnetica co-dominant; 2.5 ppb of microcystins detected.
Spring Lake — North end: Scytonema arcangelii; no cyanotoxins detected.
Harbor Lake — off Norwegian Dr: Results pending.
St. Johns River — Buzzard Island: Results pending.

On 9/29–10/2, South Florida Water Management District staff collected 32 routine HAB monitoring samples on the C43 Canal, C44 Canal, Lake Okeechobee and four HAB response samples at Lake Okeechobee S352 (lakeside), L10 Canal — S352, Lake Okeechobee — Pahokee Marina and Lake Okeechobee — S354: Dominant algal taxa and cyanotoxin results follow each waterbody name.

Lake Okeechobee — S308C (lakeside): No dominant algal taxon; trace level (0.10 ppb) of cylindrospermopsin detected.
C44 canal — S308C: No dominant algal taxon; no cyanotoxins detected.
C43 canal — S77 (upstream): No dominant algal taxon; no cyanotoxins detected.
L8 Canal — CULV10A: No dominant algal taxon; no cyanotoxins detected.
Lake Okeechobee S352 (lakeside): Microcystis aeruginosa; an estimated 1.0 ppb of microcystins detected.
L10 Canal — S352: Microcystis panniformis; no cyanotoxins detected.
Lake Okeechobee — Pahokee Marina: Microcystis aeruginosa; 1.4 ppb of microcystins and a trace level (0.12 ppb) of cylindrospermopsin detected.
Lake Okeechobee — S354 (Lakeside): Microcystis aeruginosa and Planktolyngbya limnetica co-dominant; trace levels (0.8 ppb and 0.11 ppb) of microcystins and cylindrospermopsin detected, respectively.
KISSR0.0: No dominant algal taxon; no cyanotoxins detected.
LZ2: Raphidiopsis raciborskii; trace level (0.19 ppb) of cylindrospermopsin detected.
NES191: Raphidiopsis raciborskii; trace level (0.26 ppb) of cylindrospermopsin detected.
L001: Planktolyngbya contorta; no cyanotoxins detected.
NES135: Raphidiopsis raciborskii and Planktolyngbya contorta co-dominant; 0.27 ppb of cylindrospermopsin detected.
NCENTER: Planktolyngbya contorta; no cyanotoxins detected.
EASTSHORE: Raphidiopsis raciborskii and Planktolyngbya limnetica co-dominant; trace level (0.23 ppb) of cylindrospermopsin detected.
L004: No dominant algal taxon; no cyanotoxins detected.
L008: Planktolyngbya limnetica no cyanotoxins detected.
L005: Planktolyngbya limnetica and Planktolyngbya contorta co-dominant; no cyanotoxins detected.
POLESOUT3: Planktolyngbya limnetica no cyanotoxins detected.
POLESOUT2: Microcystis aeruginosa and Planktolyngbya limnetica co-dominant; trace level (0.12 ppb) of cylindrospermopsin detected.
POLESOUT1: Microcystis aeruginosa and Planktolyngbya limnetica co-dominant; trace level (0.12 ppb) of microcystins detected.
POLESOUT: Microcystis aeruginosa and Planktolyngbya limnetica co-dominant; no cyanotoxins detected.
KBARSE: Dolichospermum circinale and Planktolyngbya limnetica co-dominant; no cyanotoxins detected.
CLV10A: Results pending.
LZ40: Results pending.
L006: Results pending.
PALMOUT3: Results pending.
PALMOUT2: Results pending.
PALMOUT1: Results pending.
PALMOUT: Results pending.
LZ30: Results pending.
POLE3S: Results pending.
RITTAE2: Results pending.
LZ25A: Results pending.
L007: Results pending.
PELBAY3: Results pending.

On 10/1, St. Johns River Water Management District (SJRWMD) staff collected one routine HAB monitoring sample at Lake Washington — Center. There was no dominant algal taxon and no cyanotoxins detected.

Last week

On 9/25, DEP staff collected five HAB response samples. Dominant algal taxa and cyanotoxin results follow each waterbody name.

Lake Thonotosassa — Center: Microcystis aeruginosa and Microcystis wesenbergii co-dominant; trace level (0.59 ppb) of microcystins detected.
Dead Lake - South Cove: No dominant algal taxon; no cyanotoxins detected.
Dead Lake — Bull Creek Boat Ramp: No dominant algal taxon; no cyanotoxins detected.
Lake Powell — Boat ramp: Stigeoclonium subsecundum; no cyanotoxins detected.
St. Johns River — Buzzard Island: Raphidiopsis raciborskii; trace level (0.20 ppb) of cylindrospermopsin detected.

On 9/25, SJRWMD staff collected seven routine HAB monitoring samples. Dominant algal taxa and cyanotoxin results follow each waterbody name.

Georges Lake — Center: Microcystis panniformis and Planktolyngbya limnetica co-dominant; no cyanotoxins detected.
Georges Lake — North: Planktolyngbya limnetica; no cyanotoxins detected.
Georges Lake — Canal off Santa Rosa St: No dominant algal taxon; no cyanotoxins detected.
Georges Lake — West: Raphidiopsis raciborskii and Planktolyngbya limnetica co-dominant; no cyanotoxins detected.
Georges Lake — South: Microcystis aeruginosa and Planktolyngbya limnetica co-dominant; no cyanotoxins detected.
Georges Lake — East:Microcystis panniformis and Planktolyngbya limnetica co-dominant; no cyanotoxins detected.
Crescent Lake — mouth of Dunns Creek: Microcystis aeruginosa and Raphidiopsis raciborskii co-dominant; trace level (0.11 ppb) of cylindrospermopsin 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 03, 2025 - 05:34pm