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Brewing in Bangalore means dealing with two completely different water sources depending on your location, Cauvery river water supplied by BWSSB for most of the city, and borewell water in areas where municipal supply is insufficient or unreliable. I’ve brewed with both, and they require different treatment approaches to reach the same brewing targets. Knowing which source you’re working with and what adjustments to make is the foundation of consistent water chemistry in Bangalore.
Bangalore brewing water profiles: Cauvery vs. borewell
BWSSB Cauvery water (typical profile): Bangalore’s municipal supply from the Cauvery river is treated and relatively soft. Typical measured values for BWSSB tap water: Calcium (Ca²⁺): 20–40 mg/L; Magnesium (Mg²⁺): 5–10 mg/L; Sodium (Na⁺): 5–15 mg/L; Chloride (Cl⁻): 10–25 mg/L; Sulfate (SO₄²⁻): 10–20 mg/L; Bicarbonate (HCO₃⁻): 60–120 mg/L; Total Dissolved Solids (TDS): 100–200 mg/L; pH: 7.0–7.8. This is a moderate softness profile, not as soft as Edinburgh or Burton, but significantly softer than Mumbai’s hard municipal water. The bicarbonate is the primary consideration for mash chemistry; at 60–120 mg/L, it provides moderate alkalinity that buffers mash pH above target for lighter beer styles. Borewell water (typical profile): Borewell water in Bangalore is highly variable by location but is generally hard and high-TDS. Typical borewell values: Calcium: 80–200 mg/L; Magnesium: 20–50 mg/L; Sodium: 20–60 mg/L; Chloride: 30–80 mg/L; Sulfate: 30–100 mg/L; Bicarbonate: 200–400 mg/L; TDS: 400–800 mg/L; pH: 7.5–8.5. The high bicarbonate and elevated calcium-magnesium hardness in borewell water create a much higher alkalinity baseline. Brewing with untreated borewell water will produce a mash pH significantly above 5.4–5.6 target range, affecting enzyme activity, hop bitterness character, and wort flavor. Borewell water requires either significant acid treatment to neutralize bicarbonate alkalinity or dilution with RO water before brewing adjustments. Identifying your water source: If you live in central Bangalore (Indiranagar, Koramangala, Whitefield served by BWSSB), you’re likely on Cauvery. Peripheral areas, layouts, and apartments with overhead tank supply may receive a mixture or rely primarily on borewells. A simple conductivity meter (TDS meter, ₹500–1,000) gives an immediate indication, Cauvery water reads 100–200 ppm TDS, borewell water reads 400–800+ ppm TDS.
Water adjustments for common Bangalore beer styles
Starting point recommendation: For consistent brewing chemistry in Bangalore, reverse osmosis water (RO) filtered to near-zero TDS is the most controllable starting point, especially if you have borewell water. RO systems for under-sink installation cost ₹6,000–12,000 and remove 90–95% of dissolved minerals, giving you a blank slate. From RO water, you build the mineral profile your target style requires using food-grade brewing salts available from homebrew shops. For pale ales, IPAs, American pale ales (Cauvery water): Starting with Cauvery water, the bicarbonate alkalinity needs reduction. Add lactic acid (85% food-grade) to the mash water: approximately 1–2 mL per 10 liters of liquor reduces mash pH by 0.1–0.2 pH units. Target mash pH 5.3–5.5 for hoppy styles. Add calcium sulfate (gypsum, CaSO₄) to raise calcium to 80–150 mg/L and sulfate to 100–200 mg/L for hop-forward character. Add calcium chloride to balance chloride to 50–100 mg/L. For stouts, porters, dark ales: The natural alkalinity of both Cauvery and borewell water aligns well with dark roasted malt grain bills, which contribute acidic compounds that counteract alkalinity. Borewell water diluted 50% with RO water can work well for dark beers without requiring heavy acid treatment. Target mash pH 5.3–5.5, the high roast malt contribution typically achieves this with moderate alkalinity water. For lagers, pilsners, wheat beers: These light styles are most sensitive to water chemistry. Use RO water as the base and build a soft profile matching Czech Pilsen water: Ca 40–60 mg/L, Mg 5–10 mg/L, low sulfate (20–40 mg/L), low chloride (20–40 mg/L), bicarbonate below 50 mg/L. Achieve this by starting with RO water and adding small amounts of calcium chloride (for calcium and chloride), Epsom salt (for magnesium), and lactic acid (for pH adjustment).
Common Questions
Where can I get my Bangalore tap water tested for brewing?
Getting Bangalore tap water tested for brewing-relevant ion concentrations is feasible through several routes. BWSSB publishes periodic water quality reports on their website with city-wide averages, though these are averaged across treatment plants and distribution zones, your actual tap may differ. For individual tap testing, environmental labs in Bangalore that handle potable water analysis can test for calcium, magnesium, sodium, chloride, sulfate, and bicarbonate, expect to pay ₹1,500–4,000 for a complete mineral panel. IndiaMART-listed labs such as SGS India, Bureau Veritas, and local analytical labs accept water samples by courier or drop-off. Request a “drinking water mineral analysis” rather than a full contamination panel to keep the scope and cost focused on brewing-relevant parameters. A practical shortcut: measure TDS with a cheap meter, measure pH with a pH meter or test strips, and use BWSSB’s published averages as the starting estimate for your area, for most Cauvery-supplied zones in Bangalore, the soft water profile described above is a reliable working estimate that gets you close enough for brewing purposes. Borewell water requires individual testing because variability between borewells is high even within the same neighborhood.
