Quick Answer
Sourness usually means under-extraction — your coffee hasn't pulled enough flavor from the grounds yet. Grind size, brew time and water temperature are the usual culprits.
Try These First
- Grind finer
More surface area means more extraction. - Brew for more time
Longer contact increases extraction. - Check your water
Water below about 195°F under-extracts. - Check your ratio
Too little coffee for the water can taste thin and sour.
Still Having Trouble?
What are you brewing with? We'll walk you through method-specific troubleshooting.