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Water as a resource

Geneva water is 100% local

  • 80% of the water comes from the lake
  • 20% from groundwater
  • water sources must be protected

100% local

Drinking water in Geneva comprises 80% surface water (Lake Geneva) and 20% groundwater.
According to its origin and needs, water is then processed and stored in tanks and then distributed throughout the region, through taps, fountains or at fire hydrants.
This water is used both for drinking and for domestic, agricultural, industrial or hospital needs.
Once used, the water from drains is then processed by water treatment plants and collected by SIG.

Lake Leman   Geneva Water Table
Surface water area
582 km²
  Surface 30 km²
Average altitude 372 m   Thickness 60 m
Maximum depth 310 m   Depth Between 25 et 70 m
Average renewal time 12 years   Storage coefficient 12%
Mean flow rate in Geneva 248 m³/s   Usable water reserves 16 million m³
Average collection by SIG 1.3 m³/s      

The Arve water table: water naturally filtered through the ground

A subterranean water table is a natural reservoir whereby water circulates in the space between gravel stones. Covering an area of 30 km ², the Arve water table is mainly fed by the infiltration of water from the Arve river. Covered by a layer of impermeable soil, the water remains free of pollution and does not require any treatment other than minimal disinfection to ensure its bacteriological quality when it is carried through the network of water pipelines. Rich in minerals, it is also rich in calcium.