Water
Water is the most abundant and most overlooked of the four pillars. It makes up roughly 90–95% of a finished IPA, yet drinkers never think about it — and for a long time, neither did many brewers. Today it is recognized as a quiet but decisive lever on hop character.
#More Than a Solvent
Brewers traditionally call brewing water "liquor." It is never pure H2O: it carries dissolved minerals (ions) and gases that influence mash chemistry, fermentation, and flavor.
| Ion | Effect in brewing |
|---|---|
| Calcium (Ca²⁺) | Mash health, yeast flocculation, clarity |
| Sulfate (SO₄²⁻) | Accentuates a dry, crisp, assertive bitterness |
| Chloride (Cl⁻) | Accentuates a fuller, rounder, softer mouthfeel |
| Sodium (Na⁺) | Rounds malt character; harsh in excess |
| Magnesium (Mg²⁺) | Minor yeast nutrient; bitter/sour in excess |
| Bicarbonate (HCO₃⁻) | Raises mash pH; suits dark beers, fights pale ones |
#Why Water Made History
The town of Burton-on-Trent built its brewing fame on a single accident of geology: its well water is extraordinarily high in sulfate. That mineral profile produced the crisp, dry, hop-accentuating pale ales that became the template for the English IPA. Brewers elsewhere learned to replicate it — a practice still called "Burtonisation."
The lesson of Burton is that water is not a fixed background. It is an ingredient a brewer chooses and adjusts, as deliberately as a hop or a malt.
#Water and the IPA
For a hop-forward beer, two things matter most:
- Mash pH — pale grists need a slightly acidic mash (~5.2–5.5) for proper enzyme function, clean flavor, and good hop expression. High-bicarbonate water fights this and must be corrected.
- The sulfate-to-chloride balance — the single biggest flavor lever, swinging a beer between snappy West Coast IPA bitterness and soft New England IPA roundness. This is important enough to have its own note: Water Chemistry and the Sulfate-Chloride Ratio.
Modern brewers often build water from scratch — using reverse-osmosis or distilled water as a blank slate and adding salts to a target profile. It is far easier than correcting unknown tap water. The practical methods are in Water Treatment for Brewing.
Chlorine and chloramine from municipal supply react with yeast to form chlorophenols — a medicinal, plastic off-flavor. They must be removed before brewing. See Off-Flavors in IPA.
#Continue Reading
- Water Chemistry and the Sulfate-Chloride Ratio — the key flavor lever
- Water Treatment for Brewing — adjusting water in practice
- Burton-on-Trent and Burton Pale Ale — where water made history
- Mashing — where water chemistry first acts