Geneva

The lake where diplomats drink. Alpine limestone at its most balanced.

Lake Geneva (Lac Léman) — 70%, La Filière treatment plant; Alpine springs — 30%. Services Industriels de Genève (SIG).. Lake Geneva is Europe's largest Alpine lake (580 km²), fed by the Rhône from the Swiss Alps. Alpine limestone catchment. Glacial lake — extraordinarily deep (310m). Swiss water law strictest in world.

14.8°dH

Hardness

88 mg/L

Calcium

Political grade

Drug traces

Cocaine 0.0021 μg/L —Benzoylecgonine 0.0082 μg/L —Amphetamine 0.00078 μg/L —Methamphetamine 0.00018 μg/L —Metformin 0.018 μg/L —Caffeine 0.011 μg/L —Ibuprofen 0.0018 μg/L —Hardness 14.8°dHpH 7.8Calcium 88 mg/LNitrate 4.8 mg/LCocaine 0.0021 μg/L —Benzoylecgonine 0.0082 μg/L —Amphetamine 0.00078 μg/L —Methamphetamine 0.00018 μg/L —Metformin 0.018 μg/L —Caffeine 0.011 μg/L —Ibuprofen 0.0018 μg/L —Hardness 14.8°dHpH 7.8Calcium 88 mg/LNitrate 4.8 mg/LCocaine 0.0021 μg/L —Benzoylecgonine 0.0082 μg/L —Amphetamine 0.00078 μg/L —Methamphetamine 0.00018 μg/L —Metformin 0.018 μg/L —Caffeine 0.011 μg/L —Ibuprofen 0.0018 μg/L —Hardness 14.8°dHpH 7.8Calcium 88 mg/LNitrate 4.8 mg/L

Taste Profile

The lake where diplomats drink. Alpine limestone at its most balanced.

Lake Geneva — 580 km², 310m deep, fed by the Rhône and alpine tributaries — is one of Europe's cleanest large lakes. Geneva draws 70% from La Filière treatment plant (lake water) and 30% from Alpine springs. The result is hard-ish (14.8°dH) but balanced: sodium just 6.2 mg/L (the lowest of any hard water tested), bicarbonate provides structure without weight. Cocaine is among the highest drug traces for a city this small — consistent with Geneva's banking sector demographics and EMCDDA international city data.

Tasting notes

balanced Alpine limestonemedium-full bodycleanlow sodiumdiplomatic character

Body

Medium-full body

Hardness

Hard — 14–21°dH

Finish

Medium-long. Alpine limestone without excess.

Pairs with

—Fondue genevoise
—Chasselas wine (Lavaux, UNESCO heritage)
—Swiss dark chocolate
—Café noisette

Water Memory

The lake that wrote the rules — and the water that follows them.

Lake Geneva is where the Rhône enters from the Alps and where Geneva draws its water. The same lake receives the outflow of Lac de Joux, the Arve (glacial milk from Mont Blanc), and dozens of alpine streams. It is the most legally protected large lake in Europe.

“L'eau de Genève est conforme à toutes les normes internationales et dépasse la plupart d'entre elles.”
SIG, Services Industriels de Genève Annual Report 2023.

Geological memory

Lake Geneva is a glacial over-deepening — the glacier carved 310m deep. Alpine limestone from the Rhône catchment gives the water its hardness. The lake's depth means it's thermally stratified — treatment draws from optimal depth layers.

Political memory

Services Industriels de Genève (SIG) is 100% cantonal public. Swiss water law (Gewässerschutzgesetz) sets standards stricter than EU DWD — 0.3 ng/L per PFAS compound vs EU's 0.1 μg/L total. PFAS from Geneva Airport (Cointrin) fire training areas was detected in soil; SIG confirmed no impact on distribution water.

Cultural memory

Geneva hosts the ICRC, WHO, WTO, UN — a city of international diplomacy, where conventions and standards are written. The water meets every standard written here and then some. The city that wrote the Geneva Conventions also runs its water system to world-class standards.

Water Politics

Overall

Transparency — public data access10/10

Infrastructure — pipe & treatment quality9/10

Source protection — watershed defence8/10

Geneva's SIG operates to world-leading Swiss standards — strictest PFAS limits on earth, comprehensive monitoring, full public ownership.

Failures

×Hard water (14.8°dH) — scale in appliances
×Lake Geneva phosphorus from agriculture historically created algal blooms (improving)
×Geneva Airport PFAS from AFFF — localised soil contamination (not in distribution water, but being monitored)

Achievements

✓Swiss water standards — strictest on earth (0.3 ng/L per PFAS compound)
✓Lake Geneva catchment protected under strict cantonal law
✓SIG 100% cantonal public — no private operator
✓UV + ozone — minimal chemical treatment
✓Daily testing and full public transparency

What Geneva must do

Complete Geneva Airport PFAS soil remediation; monitor Lake Léman phosphorus trends under climate warming