Health officials have advised against swimming or engaging in any water activities at Crandon Park North, a well-known beach in Key Biscayne, following water tests that revealed bacteria levels exceeding Florida's safety standards.
According to the Miami Herald, the beach remains open; however, the Florida Department of Health in Miami-Dade (DOH-Miami-Dade) recommends staying out of the water due to an increased risk of illness.
Tests conducted on Saturday indicated bacterial concentrations surpassing the state's guidelines for recreational waters.
Understanding the Bacterial Presence
This issue involves enterococci, bacteria typically found in the intestinal tract of humans and other warm-blooded animals. Their elevated presence in recreational waters serves as a potential indicator of fecal contamination.
However, this does not necessarily imply a direct discharge of human waste into the beach waters. Possible sources, as explained by the United States Environmental Protection Agency (EPA), include wastewater from boats, leaks from septic systems, stormwater runoff, and waste from pets or wildlife.
Health Risks and Recommendations
The Department of Health warned that the detected bacterial concentration poses a higher risk of illness for those entering the water and suggested avoiding any aquatic activities at Crandon Park North for the time being.
Recurring Issues at Key Biscayne Beach
This is not the first time Key Biscayne's beach has faced a similar issue. Back in September 2025, Crandon Park North was among two Miami-Dade beaches under health advisories for high Enterococcus levels. On that occasion, tests also exceeded the recommended limits for recreational water use.
Such incidents are not isolated. In July, two other Miami-Dade beaches, Bark Beach in Miami Beach and Golden Beach at the county's northeastern tip, were deemed unsuitable for swimming due to excessive enterococci. During that period, North Shore Ocean Terrace was also under caution.
FAQs Regarding Bacterial Contamination in Miami-Dade Beaches
What bacteria were found at Crandon Park North?
The bacteria detected were enterococci, which are typically found in the intestinal tracts of humans and warm-blooded animals.
Is Crandon Park North currently closed?
No, the beach is open, but health officials recommend avoiding the water due to increased health risks.
What are potential sources of contamination?
Possible contamination sources include boat wastewater, septic system leaks, stormwater runoff, and waste from domestic animals or wildlife.