Water plays a crucial role in the taste of tea, even if the differences are often subtle at first. Since tea is composed mostly of water, its quality directly influences the final result in the cup.
If you've ever felt that a tea lacked depth, or that a slight off-flavor interfered with the tasting experience, the water might be the culprit. Some bottled waters, which are very mineral-rich, can make the tea feel heavy and mask its nuances. Conversely, water that is too strongly flavored, like tap water with a chlorine taste, can overpower the tea's finest notes.
Tap water quality varies greatly from region to region. It's not necessarily bad, but it can sometimes impart a subtle aftertaste that alters the balance of the tea.
In most cases, simple filtration is enough to significantly improve the result. This produces more neutral water, allowing the tea to express itself without interference. It's not a technical detail, but a simple adjustment that can transform the tasting experience.