When are the public warning sirens tested?

All over the Netherlands, the public warning sirens are tested at exactly 12.00 noon on the first Monday of every month. The siren sounds for 1 minute and 26 seconds without interruption. This is a test signal so there is nothing to worry about. The sirens are never tested on a national or religious holiday or Remembrance Day, even if they fall on the first Monday in the month.

In an emergency, the siren will sound repeatedly

If the siren sounds repeatedly, it means that there is an emergency of some kind. You may also hear a warning over the public address system or from a loudspeaker van. Follow the instructions and advice of the public authorities.

Testing the sirens is important

Public authorities regularly test the sirens to check that they are working properly. It is essential for everyone to know the difference between the test signal and the emergency signal.

If the siren sounds at another time, what should I do?

If you hear the siren at another time, go indoors immediately. Close all doors and windows and turn on the radio or TV and find the emergency station.

Local sirens

There are approximately 3,800 public warning sirens in the Netherlands. They are all operated by local public authorities. If there is an emergency in the area where you live, the local siren will sound a warning.


If you wish to complain about the public warning siren, or if you are unable to hear it, you should contact the nearest fire service (in Dutch).