Sometimes, and the label decides it rather than the word “spring”.
What to read
European waters print a mineral analysis on the label; many US brands publish it in a water quality report on their website instead. Two numbers matter for coffee.
Bicarbonate (HCO₃⁻) — keep it low, under about 50 mg/L. This is what buffers acidity and forms scale.
Total dry residue or TDS — aim for roughly 50 to 150 mg/L. Higher and the cup goes heavy and dull; much lower and extraction suffers.
The trap
Waters marketed on their mineral richness are usually the wrong choice — several popular mineral and spring waters exceed 300 mg/L of bicarbonate, which will both flatten your coffee and scale your machine faster than most tap water.
Waters described as low-mineral, or as suitable for infant formula, are frequently close to ideal.
The cost problem
A machine using two liters a week gets through about a hundred liters a year. At bottled prices that is a substantial bill and a lot of plastic, for a result a thirty-dollar filter achieves.
Versus filtered tap water
A carbon pitcher filter removes chlorine and reduces hardness consistently and cheaply, but its ceiling is set by what comes out of your faucet: in a very hard-water area it will not reach the target range on its own. Test your filtered water first; if hardness and alkalinity are in range, use it, and if not, compare a well-chosen bottled water side by side.
When it makes sense
If your tap water is genuinely extreme — very hard, heavily chloraminated, or unpleasant in ways filtering does not fix — bottled is a reasonable interim answer.
For most people, filtered tap water is cheaper, greener and just as good.
Consistency
Whichever you choose, stick to it. Switching waters changes extraction and adds a variable you cannot see.
Last reviewed 30 October 2026