The pH (for "potential hydrogen") measures a substance’s level of acidity or alkalinity. On this scale, 1.0 to 6.9 is acidic, 7.0 is neutral, and 7.1 to 14.0 is alkaline (also referred to as basic).


Sour tastes (such as that of vinegar) come from acids, whereas alkaline substances tend to taste bitter and may seem to have a slippery feel.


Low alkaline waters (pH 7.1–7.5) may be perceived as sweet—this doesn’t mean that the water tastes sugary but simply that it tastes neither bitter nor sour. Since pH is a logarithmic scale, the difference of 1 degree indicates a tenfold increase or decrease in acidity or alkalinity. Water with a pH of 5, for example is ten times more acidic than that with a pH of 6. I find that my palate tends to register acidity as a major component of taste at a pH of 5 or below. The following is how I describe Orientation, or the taste of water based on the pH factor, as you’ll see in my tasting notes:

Acidic pH 5 - 6.7
Neutral pH 6.7 - 7.3
Hint of Sweet pH 7.3 - 7.8
Alkaline pH 7.8 - 10

Be sure not to let the pH factor have too much influence when considering the flavor of water. In the 5 to 10 range, the pH factor plays a minor role (contributing five percent of the flavor) relative to the TDS (twenty percent) and the carbonation (seventy-five percent)

pH of common substances:
Vinegar pH 3
Wine pH 2.8–3.8
Beer pH 4–5
Milk pH 6.3–6.6
Seawater pH 8.3
Bottled water pH 5–10

  • In The News
  • History of Bottled Water
Over the past two decades, bottled water has become the fastest-growing drinks market in the world. The global market was valued at $157bn in 2013 and is expected to reach $280bn by 2020.
Water is turning into wine. The same culture that surrounds the production and consumption of wine is emerging around water. Water competitions akin to wine competitions are now held.
NY Times Science
Earth is old. The sun is old. But do you know what may be even older than both? Water.
Salt Science
Washington Post declares that unknown to many shoppers urged to buy foods that are “low sodium” and “low salt,” this longstanding warning has come under assault by scientists who say that typical American salt consumption is without risk.

History Bottled Water
Ours is the blue planet, and the hallmark of life on Earth is water. But where did this colorless, odorless liquid first come from? Recent discoveries in astrophysics suggest that water is not native to Earth.
History Bottled Water
This website appeared first in 2004 and the concept of considering water at the same level as wine and food as a natural product was still new and foreign to many.