Why Is My Espresso Sour

Sour, lemony espresso means under-extraction: grind too coarse, shot too fast, or yield too high. It's the most common beginner problem and easy to fix.

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Grinder

Finer fixes sourness.

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Editorial note: this guide reflects our home barista experience, manufacturer specifications, and aggregated owner feedback. We test gear at home, update recommendations regularly, and link to official manuals where relevant.

Reviewed by the BrewLab Editorial Team · Last updated 2026-09-27 · how we pick gear

Sour espresso troubleshooting

Sour espresso tastes like unripe fruit or vinegar. It is always under-extraction. Check these in order: (1) Grind size - finer is the #1 fix; (2) Shot time - should be 25-30 seconds; (3) Dose - 18g in, 36g out; (4) Water temperature - 200F; (5) Bean freshness - beans need 4-14 days of degas after roast.

If you have tried all of the above and still get sour shots, your beans may be too light a roast. Espresso needs a medium-dark roast - light roast beans are acidic and work better for pour-over. Try a darker roast bean and see if the sourness disappears.