Different beer styles developed in different geographic regions partly because of the local water, the mineral content of Burton-on-Trent made bold hop-forward ales, Munich's soft water produced smooth malt-forward lagers, and Dublin's high-bicarbonate water suited roasted stout character. Modern homebrewers can replicate any of these water profiles through mineral additions and acid adjustments. Understanding which profile fits which style is the foundation of deliberate water chemistry in brewing.
Classic water profiles and their signature styles
| Profile | Ca | Mg | Na | Cl | SO₄ | HCO₃ | Best for |
|---|---|---|---|---|---|---|---|
| Burton-on-Trent | 295 | 45 | 55 | 25 | 725 | 300 | English IPA, pale ales, very hop-forward |
| Munich | 75 | 18 | 2 | 2 | 10 | 295 | Helles, märzen, dunkel, malt-forward lagers |
| Pilsen | 10 | 3 | 3 | 4 | 4 | 3 | Bohemian pilsner, extremely soft, hop brightness |
| Dublin | 118 | 4 | 12 | 19 | 54 | 319 | Irish stout, high bicarbonate suits roasted malt |
| London | 52 | 6 | 86 | 34 | 40 | 166 | English bitter, porter, malt softness with some mineral character |
| Vienna | 200 | 60 | 8 | 12 | 125 | 120 | Vienna lager, amber ales |
All values in ppm (mg/L). These are approximate historical profiles, modern recreations for homebrewing target similar ratios rather than exact historical values.
Simplified profiles for modern homebrewing
Most homebrewers don't need to hit historical profiles exactly. The practical approach: design around the sulfate-to-chloride ratio and calcium level for your target style, then adjust mash pH with acid. Three simplified target profiles cover the majority of homebrew styles:
Hop-forward (IPA, pale ale): Ca 100–150 ppm, SO₄ 150–300 ppm, Cl 50–75 ppm. High sulfate emphasizes hop dryness and bitterness. Use calcium sulfate (gypsum) as primary mineral.
Malt-forward (lager, amber, stout): Ca 75–100 ppm, SO₄ 50–75 ppm, Cl 100–150 ppm. High chloride relative to sulfate emphasizes malt roundness. Use calcium chloride as primary mineral.
Balanced (pale ale, Kölsch, hefeweizen): Ca 75–100 ppm, SO₄ 75–100 ppm, Cl 75–100 ppm. Near 1:1 ratio. Use equal parts CaSO₄ and CaCl₂.
Common Questions
Do I need to start with RO water or can I adjust tap water?
Depends on your source water. Most municipal tap water with under 100 ppm total dissolved solids (TDS) can be adjusted by adding minerals, you're building up from a low baseline. Highly mineralized water (over 200 ppm TDS), very alkaline water (over 150 ppm bicarbonate), or water with elevated sodium or chloride already present is easier to manage by diluting with RO water (50/50 tap/RO blend) or using 100% RO. Get your water report from your municipal supplier and enter the values into a water chemistry tool (Bru'n Water, BrewFather, or Brewer's Friend) to see what additions are needed.
How much does water chemistry actually affect beer flavor?
Significantly, especially at the extremes. A high-sulfate water profile (200+ ppm SO₄) in an IPA produces a noticeably drier, crisper finish than the same recipe brewed with soft water, even experienced drinkers who don't know the water profile can taste it. The difference is most apparent in hop-forward and malt-focused styles where you want to emphasize one dimension; it's less critical for highly complex styles where other flavors dominate. Beginners will notice the biggest impact from getting mash pH right (5.2–5.4) before worrying about fine-tuning mineral ratios.