PÄIJÄNNE WATER TUNNEL, RESTAURATION 2001  
The greater Helsinki area is supplied with drinking water via the Päijänne water tunnel. 
With a length of 120 kilometres, it is the longest continuous rock tunnel in the world. 
The constant temperature conditions found deep in the bedrock maintains the water´s good quality.
The tunnel is excavated at a depht of 30 - 100 metres in the bedrock. 
It is built in 1973 - 1982 and rebuilt in 2001. 

More about 
Päijänne water tunnel

Pääkaupunkiseudun Vesi Oy

Lahdenpohja

 Asikkala

Hämeenkoski

   

  

 

WHY OPT FOR THE UNDERGROUND ALTERNATIVE?

The natural home for reliable municipal services.

Pumping station located under treatment plant. 

Punavuori 

 Salmisaari
coal transport tunnel

Viikinmäki waste water treatment plant in Helsinki