Beach flags in Spain: what green, yellow and red actually mean

The flag flying at the entrance to a Spanish beach is not advice. It is set by the authority that runs the beach, and under a red one, going into the water is an offence that many town halls will fine you for. Most people read the three colours roughly right and the detail wrong — and the detail is where the risk sits.

Green, yellow, red

Spanish beaches use a three-colour system, raised and lowered by the lifeguard service according to the conditions in front of them.

• Green — bathing is permitted. The sea is calm, no hazard has been reported, and the service considers the water fit for normal swimming.
• Yellow — bathe with caution. Conditions are not dangerous to everyone, but they are capable of catching out a competent adult. Stay close to the shore, stay within your depth, and keep children within arm's reach.
• Red — bathing is prohibited. Not discouraged, not inadvisable: prohibited.

Yellow is the colour that gets people into trouble, because it reads like a softer green. It is closer to a soft red. It usually means there is something in the water that will work against you — a current, a shore break, poor visibility, a swell that is bigger than it looks from the sand. A strong swimmer who ignores a yellow flag is exactly the person who ends up needing the lifeguard.

Who decides, and how often it changes

The flag is a municipal decision, carried out by the lifeguard service on duty. It is a judgement about the sea as it is right now, not a forecast, and it is reassessed through the day. The green flag you walked past at eleven in the morning tells you very little about the water at five in the afternoon — particularly on this coast, where the afternoon sea breeze routinely builds a chop that was not there at breakfast.

So check the mast when you arrive, and look again before you swim if a few hours have passed.

Why a red flag goes up

A red flag is a single signal covering very different problems. Common reasons include:

• Rough sea, heavy shore break, or currents running along or away from the beach
• A pollution incident — a spill, a sewage overflow after heavy rain, an algal bloom
• A large arrival of jellyfish
• A storm forecast to reach the coast, or lightning in the area
• A sighting or an incident that has closed the water while it is assessed
• Works, machinery or a rescue operation in progress

The flag will not tell you which of these it is. If you want to know, ask the lifeguard — they will tell you, and the answer often changes how long you should expect to wait.

The blue flag is not a safety flag

The Blue Flag — Bandera Azul — is an environmental award given by the Foundation for Environmental Education to beaches that meet standards on water quality, facilities, accessibility and environmental management. It is assessed over a season and flies all summer.

It says nothing about today. A Blue Flag beach can fly a red safety flag on the same mast on the same afternoon, and there is no contradiction: one is an annual award for how the beach is run, the other is a statement about the water in front of you this hour. Do not read the blue one as permission.

And the black flag is not official

Each summer the environmental group Ecologistas en Acción publishes a list of "black flags" for stretches of Spanish coast it considers badly managed or polluted. It is a campaign report, not a municipal signal, and you will not find a black flag flying on a beach. It can be worth reading, but it is not something to look for on the mast.

Other flags you may see

Alongside the three colours, some municipalities use signals from the international beach-safety set:

• A purple or violet flag — hazardous marine life, most often jellyfish. It is flown in addition to the colour flag, not instead of it.
• A red-over-yellow flag — the area supervised by lifeguards. Swim between these where they are used.
• A black-and-white chequered flag — a zone reserved for surfboards and small craft, which means it is not a swimming zone.

When there is no flag at all

An empty mast does not mean green. It almost always means there is no lifeguard on duty: outside the season, early in the morning, or after the service closes in the evening. Nobody has assessed the water, and if something goes wrong nobody is watching.

That is the moment to be conservative — to look at the sea properly before getting in, to swim parallel to the shore rather than out, and to not swim alone. Garbí can show you the wind, the waves and the water temperature for the hours ahead, which helps you plan. It cannot see the beach, and it is not a substitute for the flag or for the person standing under it.