Water in Alcohol Production
80% of sake is water. Burtonisation changed English ale. Pilsen's soft water created the world's most imitated beer style. Water is never neutral.
Codex Definition
Water is the largest single ingredient in nearly all alcoholic drinks and a decisive influence on their character. Its mineral content (hardness, ions such as calcium, magnesium, sulphate and bicarbonate), pH and purity affect mashing, fermentation, distillation cutting (dilution to proof) and final flavour. Famous examples include the sulphate-rich water of Burton-on-Trent (Burtonisation) that defined English pale ale, and the exceptionally soft water of Pilsen that created the pilsner style.
Canonical overview: Water is the dominant ingredient by volume in every alcoholic beverage — comprising 80–98% of the final product. Its mineral composition affects fermentation speed, pH, yeast health, enzyme activity, and the final flavour of the drink. The key dissolved ions and their effects: Calcium (Ca²⁺) — the most important brewing cation; promotes yeast health, enzyme function, and protein precipitation; lowers mash pH; aids clarity. Magnesium (Mg²⁺) — yeast nutrient at low levels; harsh/bitter at high levels (>30 mg/L). Sulphate (SO₄²⁻) — enhances hop bitterness dryness and crispness; the dominant anion in Burton-on-Trent water (gypsum). Chloride (Cl⁻) — enhances malt sweetness, roundness, and mouthfeel; contrasts with sulphate. Bicarbonate (HCO₃⁻) — raises mash pH (alkalinity); high bicarbonate water requires acid additions or dark malts to lower pH. Iron (Fe²⁺/³⁺) — inhibits yeast and sake koji activity above ~0.02 mg/L; causes browning; must be very low for sake, Pilsner, and light lager production. Sodium (Na⁺) — at low levels (below ~100 mg/L) enhances roundness; at high levels harsh.
Famous water sources and their impact
| Source | Ca²⁺ | Mg²⁺ | SO₄²⁻ | Cl⁻ | HCO₃⁻ | Classic style |
|---|---|---|---|---|---|---|
| Burton-on-Trent, England | 268 | 62 | 638 | 36 | 192 | English Pale Ale / IPA — high sulphate enhances dry, bitter finish |
| Plzeň (Pilsen), Czech Republic | 10 | 3 | 6 | 5 | 3 | Czech Pilsner — extremely soft water enables very pale, delicate, hop-forward lager |
| Munich, Germany | 76 | 18 | 10 | 2 | 171 | Dunkel / Helles — high bicarbonate requires dark malt to lower pH; suits malt-forward styles |
| Dublin, Ireland | 119 | 4 | 54 | 19 | 319 | Irish Stout — high bicarbonate alkalinity suits the acidity of roasted unmalted barley; produces Guinness's characteristic dry, clean finish |
| Nada miyamizu (Japan) | 70 | 18 | — | — | — | Hard sake water — K, P, Mg yeast nutrients → vigorous, fast fermentation → dry otokozake style |
| Fushimi goshuishui (Japan) | 15 | 3 | — | — | — | Soft sake water — gentle fermentation → delicate onnazake style (Kyoto) |
Burtonisation — deliberately altering water chemistry
The discovery that Burton-on-Trent's naturally sulphate-rich water produced superior pale ales and IPAs for export led to the practice of Burtonisation — the deliberate addition of gypsum (calcium sulphate, CaSO₄) to brewing water to replicate Burton's profile. This remains standard practice in British and American pale ale and IPA production: brewers add gypsum to their water to achieve 200–400 mg/L sulphate, producing the dry, mineral, hop-forward finish characteristic of English IPA. The effect: sulphate ions lower the perceived sweetness of residual malt flavour while enhancing the dryness of hop bitterness — producing the 'Burton snap' noted by Victorian-era beer writers.
Water in whisky distillation and dilution
Scotch whisky distilleries prize their water sources as contributing to whisky character — particularly the peat-filtered water of Highland and Island springs (which carries traces of peat-derived compounds into the wash) and the soft granite-filtered water of Speyside distilleries (which contributes to the clean, delicate character of many Speyside malts). Water is also used for dilution — reducing cask-strength spirit (typically 60–70% ABV from the still) to bottling strength (typically 40–46%). The mineral composition of the dilution water measurably affects the final whisky character, particularly mouthfeel and the interaction of fatty acid esters with water molecules at sub-40% ABV concentrations.