Red Tide Alert Lifted Near Marco Island, Florida – But Caution Advised
The Florida Department of Health in Collier County (DOH-Collier) has officially lifted a health alert issued on January 30, 2025, regarding the presence of red tide near Marco Island. Recent water samples analyzed by the Florida Fish and Wildlife Conservation Commission (FWC) indicate that the harmful algal bloom is no longer detected or has returned to background levels, allowing residents and visitors to resume water-related activities.
Lingering Concerns and Ongoing Monitoring
Despite the positive news, public health officials urge continued caution. The status of red tide can shift rapidly depending on environmental conditions. Individuals experiencing respiratory irritation or eye discomfort are advised to leave the affected area or seek refuge in air-conditioned spaces. The latest sampling results and ongoing monitoring data are available on the Protecting Florida Together website.
Understanding Red Tide: A Natural Phenomenon
Red tide is caused by a naturally occurring bloom of Karenia brevis (K. brevis), a microscopic algae found in the Gulf of Mexico. Typically forming offshore in late summer or early fall, these blooms are transported to coastal waters by wind and currents. At high concentrations, K. brevis can discolor the water, giving it a reddish or brownish hue. More information on the visual appearance of red tide can be found on Protecting Florida Together.
Health Risks Associated with Red Tide
K. brevis produces potent neurotoxins called brevotoxins, which pose a threat to both human and animal health. These toxins can affect the respiratory system, skin, and eyes. Wind and wave action can aerosolize the toxins, making them airborne and potentially causing respiratory issues. Individuals particularly vulnerable to the effects of red tide include children, the elderly, those with compromised immune systems, and people with chronic respiratory conditions. For comprehensive information on the health effects of harmful algae blooms, visit the Florida Department of Health’s dedicated webpage.
Staying Informed: Resources for Current Conditions
The FWC regularly collects and analyzes water samples throughout the state to monitor red tide levels. Up-to-date information on Florida’s water quality, public health notifications, and beach conditions is readily accessible on Protecting Florida Together. Residents can also subscribe to receive notifications regarding changes in water quality in their specific area.
A toll-free hotline is available for recorded updates on red tide conditions statewide: 866-300-9399. For information regarding local shellfish harvesting status, please visit the Florida Department of Agriculture and Consumer Services website.
Reporting Red Tide Impacts
If you experience health symptoms potentially related to a harmful algae bloom, contact the Florida Poison Information Center at 800-222-1222 to speak with a specialist.
Animal health concerns related to red tide exposure should be directed to your veterinarian.
Reports of dead, diseased, or abnormally behaving fish or wildlife should be submitted to the FWC online or by calling 800-636-0511.
For any additional health questions or concerns regarding red tide blooms, contact DOH-Collier at 239-252-8200.
The Florida Department of Health: Protecting Communities
The Florida Department of Health, nationally accredited by the Public Health Accreditation Board, is dedicated to protecting, promoting, and improving the health of all Floridians through collaborative efforts at the state, county, and community levels. Stay connected with the department on X (@HealthyFla) and Facebook, or visit www.FloridaHealth.gov for more information.
