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Red Tide Current Status

Daily Sample Map
This map contains the last eight days of sampling and is updated daily at 5 p.m.
Please be sure to click on individual dots for sampling details.

Red Tide Mid-Week Update for September 22, 2021

Current Conditions

A patchy bloom of the red tide organism,  Karenia brevispersists along Florida’s Gulf coast, where cells were detected in 55 samples over the past week. Bloom concentrations (>100,000 cells/liter) were observed in 13 samples: one from Okaloosa County, seven from and offshore of Pinellas County, two from Manatee County, and three from offshore of Sarasota County. Additional details are provided below.

  • In Southwest Florida over the past week, K. brevis was observed at background to high concentrations in and offshore of Pinellas County (in 15 samples), background concentrations offshore of Hillsborough County (in one sample), background to medium concentrations in Manatee County (in eight samples), background to medium concentrations in and offshore of Sarasota County (in 17 samples), background concentrations in and offshore of Charlotte County (in three samples), and background to low concentrations in and offshore of Lee County (in seven samples). Samples collected from or offshore of Collier and Monroe counties did not contain K. brevis.
  • In Northwest Florida over the past week, K. brevis was observed at medium concentrations in Okaloosa County (in one sample), background concentrations offshore of Hernando County (in one sample) and background to very low concentrations in Pasco County (in two samples). Samples collected from or offshore of Walton, Bay, Gulf, Franklin, Wakulla, Levy, and Citrus counties did not contain K. brevis.
  • Along the Florida East Coast over the past week, K. brevis was not observed.

Fish Kills

Fish kills suspected to be related to red tide were reported on the Florida Gulf Coast in or offshore of Okaloosa, Walton, Levy, Pasco, Pinellas, Manatee, Sarasota, and Lee counties over the past week. For more details, please visit:

Respiratory Irritation

Respiratory irritation suspected to be related to red tide was reported over the past week on the Florida Gulf Coast in Okaloosa, Walton, Pinellas, Manatee and Lee counties. For recent and current information at individual beaches, please visit and for forecasts that use FWC and partner data, please visit


Forecasts by the USF-FWC Collaboration for Prediction of Red Tides for Pinellas to northern Monroe counties predict variable transport of surface and subsurface coastal waters in most areas over the next 3.5 days.

Piney Point Updates

FWC-FWRI is working closely with the Florida Department of Environmental Protection (FDEP) and other partners on the Piney Point response effort. Status updates and results are posted on the Protecting Florida Together website ( and on the Tampa Bay Estuary Program website (

Red Tide Status Map (September 22, 2021)

Statewide Red Tide Counts September 14 through 21, 2021

View a larger map (September 22, 2021).

The next complete status report will be issued on Friday, September 24th. Please check our daily sampling map which can be accessed from the top of this page.

Archived status maps can be found in our Flickr gallery. Previous regional status reports and maps can be found on our red tide resources page.

Latest Red Tide Status Report Available by Phone

Call 866-300-9399 at any time from anywhere in Florida to hear a recording about red tide conditions throughout the state. Callers outside of Florida can dial 727-502-4952. Standard calling charges apply.

Reports are updated on Friday afternoon except during holidays, in which case the report will be released on the closest day. Additional information, if available, is provided on Wednesday afternoon. To receive an e-mail when the current status has been updated, visit our subscription area.

Additional Information

For additional information about red tide and the current red tide bloom, including information on how to report a fish kill or other wildlife effects, consult health authorities about human exposure, or locate other resources, visit our Red Tide-Related Hotlines and Information Sources article.

Blue-Green Algae Bloom Information

Additional information regarding the current status of algal blooms in South Florida is being consolidated and posted on the Florida Department of Environmental Protection’s website:

Key for Results

Description K. brevis abundance Possible effects (K. brevis only)
NOT PRESENT- BACKGROUND background levels of 1,000 cells or less no effects anticipated
VERY LOW > 1,000 - 10,000 cells/L possible respiratory irritation; shellfish harvesting closures when cell abundance equals or exceeds 5,000 cells/L
LOW > 10,000 - 100,000 cells/L respiratory irritation; shellfish harvesting closures; possible fish kills; probable detection of chlorophyll by satellites at upper range of cell abundance
MEDIUM > 100,000 - 1,000,000 cells/L respiratory irritation; shellfish harvesting closures; probable fish kills; detection of surface chlorophyll by satellites
HIGH > 1,000,000 cells/L as above, plus water discoloration