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The Florida Department of Health works to protect, promote & improve the health of all people in Florida through integrated state, county, & community efforts.

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Below is an example of a Red Tide sign that is posted at Sarasota Beaches.

Image of Red Tide Sign


Main Administrative Office

Below is an example of a "No Swim" Advisory sign that is posted at various Sarasota County Beaches.

Example of a Red Tide Sign

There is a bacteria advisory for Bird Key Park. Refer to the chart below.

Enteric Bacteria 

Enteric bacteria water test results

(Note: Results for enterococcus are given in “CFU”, or “colony forming units” and a number of 71 or greater is considered “poor”.)


Longboat Key 8/13/2018 28 No
Bird Key Park 8/13/2018 76 Yes
Bird Key Park(resample) 8/15/2018 328 Yes
Bird Key Park(resample) 8/18/2018 <4 No
North Lido Beach 8/13/2018 40 No
​Lido Beach (Casino) 8/13/2018 16 No
South Lido Park 8/13/2018 16 No
Siesta Key 8/13/2018 168 No
Siesta Key 8/15/2018 <4 No
Turtle Beach 8/13/2018 16 No
Nokomis Beach 8/13/2018 28 ​No
North Jetty 8/13/2018 64 ​No
Venice Beach 8/13/2018 8 No
Service Club Park 8/13/2018 12 No
Venice Fishing Pier 8/13/2018 4 No
Brohard Beach 8/13/2018 8 No
Caspersen Beach 8/13/2018 36 No
Manasota Beach 8/13/2018 4 No
Blind Pass 8/13/2018 4 No

Enterococcus (CFU per 100 ml)
Good Moderate Poor
0-35 36-70 71 or greater

Enterococcus (CFU per 100 ml)
Good Moderate Poor
0-35 36-70 71 or greater

Water samples are tested for elevated levels of ‘indicator’ bacteria. These are known as enterococcus or enteric bacteria, some of which are naturally present in the environment. These bacteria are known to inhabit the intestines of humans and warm-blooded animals.

Enteric bacteria can come from a variety of sources, including stormwater runoff, pet waste and wildlife and human sewage from failed septic systems and sewage spills.

Health Risks

When these enteric bacteria are detected in high concentrations in recreational waters, there is a risk of illness and infections. Some people who swallow water while swimming or have contact with water entering the skin through a cut or sore may become ill with gastrointestinal illnesses, infections or rashes.  

Vibrio vulnificus

Vibrio vulnificus is another type of bacteria. It is naturally occurring. The Florida Department of Health (DOH) does not sample for this bacteria because it is commonly found in warm, brackish and sea water and in shellfish, especially during the summer months.

DOH is constantly monitoring reportable diseases and has appropriate ways to alert the public if needed.

News reports have incorrectly characterized Vibrio vulnificus as a flesh-eating bacteria. It is important to know that there is no such medical term or marine organism.

Infection by Vibrio vulnificus is a rare but serious disease. It is caused by eating raw or undercooked shellfish, particularly oysters or by exposing cuts and wounds to brackish and salt water where the bacteria exists.

The breakdown of the skin known as necrotizing fasciitis is very rare and is most commonly associated with Group A Strep infections, not Vibrio vulnificus.

Millions of people visit Suncoast beaches each year. If you are healthy, have a strong immune system, and practice good hygiene and proper wound care, your chances of getting necrotizing fasciitis is extremely low.

You can download informational articles provided by DOH about vibrio here:

DOH Fact Sheet[PDF 116KB]

Tips for a Healthy and Fun Day at the Beach[PDF 161KB]

For additional information, please visit the CDC website shown below.

Additional Information about Vibrio vulnificus: Centers for Disease Control and Prevention (CDC):