District heating leaks

If you notice a district heating leak on your property or in its surroundings, please notify us. Steam or green water are signs of district heating leaks.

The water flowing in the district heating network is dyed green to make it easier to detect possible broken pipes and equipment. Pyranine is used as the dye; it is completely harmless to humans and animals as an aqueous solution.

District heating water is softened and chemically treated to prevent blockages and corrosion caused by oxygen. Although district heating water is non-toxic, it should not be used as domestic or drinking water.

Water circulating in a district heating network can reach temperatures of up to 100 degrees Celsius, which is why contact with the water should be avoided. Hot steam can also be dangerous. In winter, a thawed area on the ground can indicate potential district heating leaks.

What should I do if I notice a district heating leak?

If you notice green district heating water or steam in the terrain or environment, please report it to our fault number 06 423 1584.

If the property’s domestic hot water is green, the heat exchanger of the property’s hot water has broken and district heating water is getting mixed with domestic water. Green-coloured district heating water reveals leaks at an early stage. This way, the proportion of district heating water in relation to the hot water cannot increase significantly. Although district heating water is non-toxic, it should still not be used as domestic or drinking water.

If you notice that your domestic water has turned green, please contact our fault number 06 423 1584. The fault number serves you 24/7.