When you see a purple flag flying near the shoreline, it isn’t just decoration—it’s a specific ocean safety signal with a clear purpose. Beach flag systems (with colors like green, yellow, and red) tell swimmers about water and current conditions, but purple has a different focus: it warns that hazardous marine life (often called “marine pests”) has been spotted in the water.

Unlike green (safe water), yellow (moderate hazard), or red (dangerous conditions), the purple flag doesn’t primarily relate to waves or currents. Instead, it alerts beachgoers to the possible presence of animals like jellyfish, stingrays, sea snakes, or other creatures that can sting or cause minor injuries. This doesn’t automatically mean the water is closed, but it does mean you should be extra cautious if you decide to swim.

The purpose of the purple flag is to promote awareness and informed choice, not to incite panic. Marine life moves with tides and currents, so their presence near shore can vary throughout the day. A purple flag simply reflects recent sightings of animals that might cause harm, inviting swimmers to pay attention rather than assume everything is safe.

When a purple flag is displayed:

• Talk with lifeguards to learn which creatures have been seen and where they were spotted. Lifeguards monitor conditions closely and can give specific advice.

• Swim with caution or stay near the shore if you do enter the water.

• Be especially careful in shallow areas where some animals—like stingrays—tend to rest.

You don’t need special gear to stay safer under a purple flag, but simple precautions help. For example, performing a “stingray shuffle” (sliding your feet along the sand) alerts stingrays to your presence so they can move away, reducing the chance of accidental contact. Protective swimwear like rash guards can also help limit skin exposure if jellyfish are present.

Children require extra supervision because they might be less aware of their surroundings and more likely to venture into shallow areas without caution. Lifeguards are trained to assist with marine stings, and knowing where they’re stationed can give you peace of mind.

Importantly, the purple flag doesn’t mean the ocean is hostile—just that it’s alive and dynamic. Marine creatures are natural parts of the ecosystem, and the flag helps beachgoers share the space responsibly. When people respect the symbol, ask questions, and adjust their behavior, they enhance both safety and enjoyment of the water.