Tea Brewing Guide: Water Temperature, Steeping Time and Flavor by Tea Type

Tea is made from the leaves of the same plant, Camellia sinensis, but white, green, oolong and black teas are processed differently, mainly through varying degrees of oxidation. That difference in processing is why each type calls for its own water temperature and steeping time, according to brewing guidance published by tea retailer Harney & Sons and the UK Tea & Infusions Association, an industry body representing tea producers and sellers.

Why temperature and time matter

Hotter water and longer steeps pull more compounds out of tea leaves, but not all compounds extract at the same rate. A 2015 study on CTC black tea published in Nutrition Journal and archived on the US National Center for Biotechnology Information's PubMed Central found that caffeine and gallic acid are released almost immediately, within the first two minutes of steeping, while total polyphenols and flavonoids continue rising more slowly and reach their peak concentration between six and eight minutes. The same study found that antioxidant activity correlated strongly (p<0.001) with polyphenol, flavonoid and epigallocatechin gallate (EGCG) levels, while caffeine contributed little to that antioxidant effect.

The UK Tea & Infusions Association advises using freshly drawn water rather than water that has been reboiled, saying reboiling lowers the water's oxygen content and reduces the flavor the tea can release. It also recommends one tea bag or one rounded teaspoon of loose tea per cup as a general starting ratio.

Brewing settings and flavor by tea type

Sources do not fully agree on black tea: Harney & Sons' chart calls for a full 212°F (100°C) boil and a 5-minute steep, while the UK Tea & Infusions Association gives a slightly lower range of 90–98°C and shorter steeps of mostly 3–4 minutes, reserving 4–5 minutes for smoky styles such as Lapsang Souchong. Both agree black tea needs the hottest water and the longest steep among the five categories above.

How to brew a cup, step by step

1. Start with freshly drawn, cold tap or filtered water — the UK Tea & Infusions Association advises against reboiling water that has already been boiled once.
2. Heat the water to the temperature listed for the tea type being used: roughly 80°C/175°F for white and green teas, 80–100°C/180–212°F for oolong, and 90–100°C/194–212°F for black tea, per Harney & Sons and the UK Tea & Infusions Association.
3. Measure about one tea bag or one rounded teaspoon of loose leaf per cup, the ratio recommended by the UK Tea & Infusions Association.
4. Pour the hot water over the tea and steep for the time listed for that type, generally 1–4 minutes for white and green tea and 3–5 minutes for oolong and black tea.
5. Remove the tea bag or leaves as soon as the time is up; leaving leaves in longer continues extracting compounds and can shift the taste, per the extraction patterns described in the NCBI-published brewing study.
6. If adding milk, add it after the tea has steeped and the bag or leaves have been removed, per the UK Tea & Infusions Association's guidance that 'milk in last is best.'

Common mistakes

The clearest mistake across the sources is mismatching temperature to tea type: using fully boiling water on delicate white or green tea, or under-heating water for black tea or herbal infusions. The UK Tea & Infusions Association also flags reboiled water and storing tea near strongly flavored foods as avoidable causes of flat-tasting cups. Because brands process the same tea category differently, both Harney & Sons and the UK Tea & Infusions Association recommend checking the specific product's packaging when its instructions differ from general charts.