Why does my coffee taste dry, chalky or astringent?

Updated 18 October 2026

Short answer

Dry, chalky or astringent coffee is over-extracted, usually made worse by fines. Change one thing per brew, in this order: Grind coarser, then pour lower and gentler, then move some brew water to bypass.

What it means

Astringency isn't really a taste — it's the dry, chalky, tongue-scraping feeling you'd get from over-steeped black tea. In coffee it comes from polyphenols like chlorogenic acids: big, slow-dissolving molecules that only reach the cup when extraction runs high.

Fines make it worse twice over. They extract fast themselves, and on a pour over they clog the bed and cause channelling. So it's treated like bitterness — extract less, starting with a coarser grind — with water as a later step, since very hard water can make a cup feel chalky too.

Pour over: what to change

Pour over (V60, Chemex, Kalita Wave, Origami, Orea). Try these one at a time, in this order — move on to the next only when the one before hasn't fixed it.

1
Grind coarser
Go about 60 µm (2 clicks on a Comandante C40) coarser. Bigger particles and fewer fines mean less surface and a freer flow, so less is extracted — and less of the late-dissolving bitter and drying compounds make it into the cup.
2
Pour lower and gentler
A lower, calmer pour disturbs the bed less, extracts less, and keeps fines from migrating down and clogging the filter.
3
Move some brew water to bypass
Brew with about 10% less water — 225g instead of 250g — and add the difference as hot water afterwards. Less water runs through the grounds, so fewer of the late, bitter compounds come out, and the cup keeps its size and strength.
4
Lower the temperature
About 3°C cooler. Cooler water extracts more slowly — a gentler change than grind, so try it once grind and time have had their turn.
5
Lower your water's mineral content
About 20% fewer minerals — 150 to 120 ppm, say. Softer water extracts more gently, and with less buffering on the acidity it reads cleaner and brighter.
6
Try a cleaner water profile
Last resort. A new water changes several flavours at once, which makes it hard to tell what did what — so it comes after every single-variable change has had its go.

Immersion: what to change

Immersion (AeroPress, French Press, Hario Switch). Try these one at a time, in this order — move on to the next only when the one before hasn't fixed it.

1
Grind coarser
Go about 60 µm (2 clicks on a Comandante C40) coarser. Bigger particles and fewer fines mean less surface and a freer flow, so less is extracted — and less of the late-dissolving bitter and drying compounds make it into the cup.
2
Shorten the steep
Press, plunge or open the valve about 15 seconds sooner, so the water has less time to reach the slow-dissolving bitter compounds.
3
Agitate less
Fewer stirs, or none after the bloom. Stirring speeds extraction, and it also churns fines into suspension.
4
Move some brew water to bypass
Brew with about 10% less water — 225g instead of 250g — and add the difference as hot water afterwards. Less water runs through the grounds, so fewer of the late, bitter compounds come out, and the cup keeps its size and strength.
5
Lower the temperature
About 3°C cooler. Cooler water extracts more slowly — a gentler change than grind, so try it once grind and time have had their turn.
6
Lower your water's mineral content
About 20% fewer minerals — 150 to 120 ppm, say. Softer water extracts more gently, and with less buffering on the acidity it reads cleaner and brighter.
7
Try a cleaner water profile
Last resort. A new water changes several flavours at once, which makes it hard to tell what did what — so it comes after every single-variable change has had its go.

Cold brew: what to change

Cold brew. Try these one at a time, in this order — move on to the next only when the one before hasn't fixed it.

1
Grind coarser
Go about 60 µm (2 clicks on a Comandante C40) coarser. Bigger particles and fewer fines mean less surface and a freer flow, so less is extracted — and less of the late-dissolving bitter and drying compounds make it into the cup.
2
Steep for less time
Cut the steep by about 12.5% — two hours off a 16-hour steep.
3
Lower your water's mineral content
About 20% fewer minerals — 150 to 120 ppm, say. Softer water extracts more gently, and with less buffering on the acidity it reads cleaner and brighter.
4
Try a cleaner water profile
Last resort. A new water changes several flavours at once, which makes it hard to tell what did what — so it comes after every single-variable change has had its go.

Change one thing at a time

It's tempting to grind finer and raise the temperature and pour differently. Then the next cup is better or worse and you don't know why. One change per brew is slower on paper and much faster in practice. The full dial-in guide covers the order to fix things in when there's more than one problem.

Questions

Why does my coffee taste dry or astringent?

Dry, chalky or astringent coffee is over-extracted, usually made worse by fines. Astringency isn't really a taste — it's the dry, chalky, tongue-scraping feeling you'd get from over-steeped black tea. In coffee it comes from polyphenols like chlorogenic acids: big, slow-dissolving molecules that only reach the cup when extraction runs high.

How do I fix astringent coffee?

Change one thing per brew. On a pour over: Grind coarser, then pour lower and gentler, then move some brew water to bypass. On an AeroPress, French Press or Hario Switch: Grind coarser, then shorten the steep, then agitate less.