Water protection

The annual water consumption of CERN in 2018 was about 3.5 million m3. For comparison, the water consumption of the Canton of Geneva was about 52.7 million m3 in 2018. The water used at CERN is mainly supplied by the Services Industriels de Genève (SIG). The raw water is pumped from the Lake Léman (CH), treated at the Station de traitement des eaux des Tuileries (Bellevue, Canton of Geneva) and then delivered to CERN.

Water at CERN is mainly used for cooling the accelerator facilities, for industrial activities and for sanitary purposes. Good practices are applied to guarantee sustainable consumption of water and most of the water is returned into French and Swiss watercourses neighbouring CERN’s premises (i.e. Nant d’Avril, L’Allondon, Le Lion, etc.). Effluents from CERN’s facilities are continuously monitored at the main water discharge points into these watercourses. For more information please see the CERN Environment Report.

The sanitary water is directed to Swiss wastewater treatment plants for treatment previous to their discharge into rivers.

Annual water consumption 2000-2018

CERN’S ANNUAL WATER CONSUMPTION 2000 - 2018. Based on data from Services Industriels de Genève and Régie des Eaux Gessiennes. 


Water release pathways

THE DISTRIBUTION OF SUPPLIED WATER DETAILING THE RELEASE PATHWAYS. Data on evaporation and effluents are measured on-site. Data on sanitary sewage are measured by the Host States. This does not include the release of precipitation runoff or infiltration water.