Bois-de-Bay Treatment Plant

Opened in 2009, the Bois de Bay STEP (‘STation d’EPuration) is one of the largest water treatment plant in Switzerland. Nearly 300 litres of wastewater enters the plant every second from Meyrin, Satigny, Aïre-la-Ville and part of the Pays-de-Gex to be treated.

The plant’s treatment capacity represents 130,000 inhabitants, and the wastewater conveyance network at Bois-de-Bay includes two tunnels, two treatment plants with pressures pipes and a large network of drains.


Guided tours last approximately 1hr30mins.

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