Most beach visitors are familiar with the basic warning flag system. A green flag signals relatively calm conditions, yellow advises caution, and red warns of dangerous surf or strong currents.
But every year, many beachgoers encounter a less familiar flag that can cause immediate concern: the purple flag.
Imagine enjoying a sunny day by the ocean when lifeguards suddenly move toward the shoreline, raise a purple flag, and begin warning people to stay out of the water. Even if the ocean appears calm, the sudden change in atmosphere can be unsettling.
So what exactly does a purple flag mean?
The answer may surprise you.
The Meaning of the Purple Flag
In many beach warning systems throughout the United States and other coastal regions, a purple flag indicates the presence of potentially dangerous marine life.
Unlike red flags, which warn about hazardous water conditions such as rip currents, high surf, or rough seas, a purple flag alerts swimmers to biological hazards in or near the water.
The flag doesn’t necessarily mean there is an immediate emergency. Instead, it serves as a warning that marine animals capable of causing injury or discomfort have been spotted in the swimming area.
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