Sourdough Starter With Hooch (Liquid on Top) — What It Means & What to Do
Hooch is alcohol. Yeast has metabolized all the available sugars in the flour and produced alcohol as a byproduct. Your starter is hungry, not dying.
A clear, gray, or even brownish liquid has settled on top of (or sometimes inside) your starter. The starter underneath looks fine, but you don't know whether to stir it in or pour it off.
What it looks like
- Thin layer of clear, gray, or brown liquid on the surface
- Sometimes the liquid is mid-jar with starter both above and below
- Starter underneath may look deflated and pasty
- Mild alcoholic smell, sometimes with a vinegar edge
Why this happens
Hungry starter
Most common cause. The starter ate everything, finished producing CO2, and is now sitting in its own alcoholic exhaust.
Hydration drift in the fridge
Cold causes water to separate from the flour gel. After a week or two in the fridge, you'll often see a hooch layer even on a recently-fed starter.
Too-thin feeding
If you're feeding at 100%+ hydration and your kitchen is warm, the starter ferments very fast and produces hooch quickly.
How to fix it
Stir the hooch back in
For tangier bread, stir the hooch (which contains organic acids) back into the starter, then feed normally. Most bakers do this.
Pour the hooch off
For milder bread, pour the hooch off before feeding. You'll lose some of the acidic complexity, but the result is more wheat-forward.
Then feed at 1:5:5 or 1:10:10
Once hooch appears, the starter is past peak. A bigger feeding ratio (1:5:5 or 1:10:10) gives it more food and a longer window before the next hooch layer forms.
Preventing it next time
- Feed more frequently or at a larger ratio.
- If keeping in the fridge, pull it out weekly to feed.
- Lower the hydration slightly (drop from 100% to 80%) if your starter chronically produces hooch fast.
Most starter problems show up in the data.
Sarah's Sourdough — the iOS app — logs every feeding, photographs every rise, and predicts peak by your kitchen temperature. Problems become visible weeks earlier.
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Related problems
Smells like nail polish remover
Your starter is starving. Acetone is what active yeast produces when it's eaten everything in the jar and started consuming itself.
Pink, orange, or fuzzy spots on top
This is the only sourdough problem that means real trouble. Mold has established. The starter cannot be saved by stirring it in or skimming the top off.