No. 005 Which water should you choose for tea? The secret to a perfect brew

Why does water change the taste of tea?

“The same leaf. Two waters. Two surprisingly different cups.”

In the previous Tsuru, we followed the picker’s movements and discovered why a bud and two young leaves can determine the finesse of a great tea.

But once these leaves reach us, another element takes over. Invisible, familiar, and often overlooked: water.

It fills almost the entire cup. It extracts the aromas, carries the flavors, and shapes the texture. The right water can reveal a tea’s freshness, sweetness, and length. The wrong water, on the other hand, can cloud its aromas or accentuate its bitterness.

Water is not merely a medium: it is one of the ingredients of tea.

A meeting between leaf and water

When hot water comes into contact with the leaves, it gradually dissolves a multitude of aromatic and flavor compounds. Some bring sweetness, others freshness, astringency, body, or bitterness.

This extraction naturally depends on the tea, the amount of leaves, the duration, and the temperature. But it also depends on the composition of the water itself.

Two clear, seemingly odorless waters can contain very different proportions of minerals. In the cup, this difference can sometimes become obvious.

Mineral content: a matter of balance

So-called “hard” water contains a lot of minerals, especially calcium and magnesium. These minerals are not bad in themselves. They even contribute to the structure of the water and can give it a rounder feel.

But when they are too prominent, they can stifle the tea’s aromatic expression. The liquor then appears heavier, less luminous, and sometimes covered by a thin film on the surface. The delicate notes of a green tea or a fine vintage become harder to perceive.

Conversely, water that is almost entirely devoid of minerals, such as certain demineralized or distilled waters, is not necessarily ideal. It can produce a cup that lacks structure, feels sharp, or is unbalanced.

The best choice is generally somewhere in between: fresh water that is pleasant to drink, lightly to moderately mineralized, and complements the tea without overpowering it.

Chlorine and odors: the hidden enemies

Tap water can be perfectly drinkable while retaining a chlorine smell or aromas from the pipes. In a glass of cold water, they may sometimes seem faint. When heated, they can become more noticeable and mask the nuances of the tea.

If your water has a strong odor, let it sit for a while in an open carafe or use a suitable filter. Filtered water must remain fresh: store it properly and replace the cartridge regularly according to the manufacturer’s recommendations.

A simple test is to smell the water before heating it, then again immediately after. If a smell is already dominant, it will probably accompany the infusion.

Should you boil the water for a long time?

Prolonged boiling does not improve overly mineralized water. On the contrary, it can concentrate certain minerals as the water evaporates.

Heat only the amount you need and avoid repeatedly boiling the same water left in the kettle. Freshly poured water generally produces a cleaner cup.

Temperature remains essential: a delicate green tea often requires cooler water than a black tea or Pu-erh. But temperature and water quality play two different roles. The former determines the speed of extraction; the latter influences what that extraction allows to come through.

Which water should you choose for everyday use?

Start with the simplest solution. Taste your tap water. If it is pleasant, free of unpleasant odors, and has low mineral content, it may be perfectly suitable.

If it masks the aromas or quickly leaves scale in the kettle, try filtered water or lightly mineralized spring water. There is no need to seek out rare or expensive water: the goal is neutrality, freshness, and balance.

• Pleasant tap water: use it directly or after letting it sit briefly in a carafe.
• Chlorinated or very hard water: try a suitable filter.
• Bottled water: choose spring water with a neutral taste and moderate mineral content.
• Distilled or demineralized water: avoid using it on its own for brewing.

Experiment with your tea

The best way to understand the influence of water is to compare.

1. Choose a tea you know well.
2. Prepare two cups with the same amount of leaves.
3. Use the same temperature and steeping time.
4. Change only the water: for example, filtered tap water in one cup and lightly mineralized spring water in the other.
5. Compare the aroma, color, sweetness, bitterness, and length on the palate.

An expressive tea makes this exercise particularly revealing. You can try it with our Japan Genmaicha with Bancha and Roasted Rice: balanced water helps distinguish the sweetness of the Bancha and the roasted notes of the rice.

You can also explore our selection of green teas, whose fresh, vegetal nuances quickly reveal the differences between two waters.

When the cup becomes clearer

Good water should not add a striking flavor. Its role is more subtle: to let the leaf speak.

With the right water, aromas often appear more distinct. The texture becomes more harmonious. Bitterness ceases to dominate. The finish gains clarity.

This principle applies to all tea families derived from Camellia sinensis. Yet, each tea reacts differently. A delicate green tea, a roasted oolong, or a robust black tea will highlight different characteristics of the water.

That is the beauty of tasting: changing a single element allows you to rediscover a leaf you thought you knew.

A word from Cap sur le Thé

Before changing your teapot, increasing the amount of leaves, or extending the steeping time, observe your water.

Is it pleasant to drink on its own? Does it leave scale quickly? Does it develop an odor after heating? These three simple questions can transform the way you prepare tea.

The perfect recipe does not exist everywhere in the same way. It is built around your water, your tea, and your palate.