Bois-de-Bay WWTP

The Bois-de-Bay plant continuously treats wastewater in a way that best conserves the quality of the Rhône's water, where the treated water is discharged.


The Bois-de-Bay WWTP was commissioned in April 2009. It is one of the largest water treatment plants in Switzerland and treats water from parts of Pays-de-Gex, Meyrin, Satigny and Aïre-la-Ville, doing so by eliminating polluted water discharges into the Allondon, a river of remarkable beauty with a variety of fauna.

Key figures

  • 130'000 habitantes et habitants raccordés à la station

  • + de 250 litres d’eaux usées entrent chaque seconde dans la station

Tour information

Target audience


These guided tours are suitable for companies, schools, organisations and public bodies.

They are organised for groups from 10 people minimum to 20 maximum. Recommended age: from 10 years old.

Please note: Visits are unsuitable for persons with reduced mobility.


Tour information


From Monday to Friday from 9 a.m. to 1 p.m. (last tour).

Duration: 1.5 hours

Languages: French, English




Tours are free for schools, organisations and public bodies.

For companies, the price is CHF 300 per guide (20 people).

Registration is required


Registration information


Once you have filled out our form, you will receive a confirmation e-mail.

For more information, contact us via, or at 022 420 85 81.


Read the visiting rules 


In view of the high number of local requests that we receive, we would like to inform you that we can no longer welcome visitors from regions other than Switzerland or “Greater Geneva”.

Thank you for your understanding.


Register for a visit

Where to find us