What's the Liquid on Top of Your Starter?
It's alcohol, your starter is hungry, and it's completely fine. Pour it off for a milder starter or stir it in for a tangier one — then fix the feeding schedule.
It's alcohol. Your starter is hungry. It's completely fine.
What you're seeing
A thin layer of liquid pooled on top of your starter, flat and level the way water sits in a glass. It might be clear, straw-colored, gray, brown, or nearly black. Under it, the starter itself has probably collapsed from its peak and looks a little slack, maybe with a sunken center or a tide line on the jar wall where it rose to before falling.
It smells sharply of alcohol — nail polish remover, beer, or vinegary wine.
If it has any height, any fuzz, or any pink, orange, green, or black colored patch that sits raised on the surface, that isn't this. That's mold, and it's the one situation where you throw the jar out. See is this mold on my starter.
This liquid is called hooch, and it's flat by definition. Flat means fine.
The cause: fermentation ran past the food supply
Your starter's yeast eats the sugars in flour and produces two things: carbon dioxide, which lifts the starter, and ethanol, which is alcohol. That's what fermentation is — the same process that makes beer, run in a jar of flour paste.
While there's flour left to eat, the yeast produces gas fast, the starter inflates, and the alcohol stays dissolved in the paste. Once the available starch and sugar are used up, gas production stops and the bubbles collapse. The gluten network, weakened by hours of acid and enzyme activity, releases the water it was holding. That water plus the accumulated alcohol separates out and floats, because it's less dense than the flour paste beneath it.
So hooch means one thing: the starter has been going longer than its last feeding could support.
Color tells you how long, not how dangerous. A clear or pale straw layer means it's a few hours past peak. Gray or light brown means a day or two. Dark brown or nearly black means weeks, and comes from oxidized flour compounds and darker fermentation byproducts. A black hooch layer is not a safety problem. A three-week-old starter under black hooch will almost always come back with two feedings.
How long has it been since you fed it?
Where is the jar?
38–40°F (3–4°C)
7 days at 38–40°F (3–4°C)
Still fine.
Gray is well past the last feed. Color tells you how long, not how dangerous.
One to three weeks at 38–40°F (3–4°C) and a jar with an inch of dark liquid over gray paste is a stored starter behaving exactly as expected. This is where most people meet hooch, and it is the most benign version of it.
Pour off or stir in, discard down to 20 g (0.7 oz), then feed 1:5:5 — 20 g (0.7 oz) starter, 100 g (3.5 oz) flour, 100 g (3.5 oz, 100 ml) water — and leave it at 68–72°F (20–22°C). Lively on the second feed, ready to bake on the third. Do not bake with the first feed straight out of the cold at 38–40°F (3–4°C). To get less of it next time, refrigerate 2–3 hours after feeding at 68–72°F (20–22°C), while it is still climbing.
Both are correct. Pick the flavor you want.
Next loaf: Balanced
Pouring it off takes the accumulated alcohol and acid out with it, so the starter is milder and the next loaf less sour. Choose it if you want a mild, sweet loaf, or the hooch is very dark and smells harsh.
The only thing you have to rule out
Flat and level is hooch. It sits like water in a glass, whatever its color. Fine.
Fuzzy and raised is mold. A patch with height of its own, in pink, orange, black, green or blue-green. Throw the whole jar out.
The fix right now: your choice of two
Both are correct. Pick based on the flavor you want.
| What you do | What happens | Choose it if |
|---|---|---|
| Pour it off | Removes accumulated alcohol and acid, so the starter is milder and less sour on the next build | You want a mild, sweet loaf, or the hooch is very dark and smells harsh |
| Stir it in | Keeps the alcohol and acids in the culture, so the starter is tangier and the loaf more sour | You want more sourness, or you're building a stiff levain for a sharp loaf |
Then feed it, either way. Discard down to 20–50 g (0.7–1.8 oz) of starter and add equal weights of flour and water — 50 g (1.8 oz) flour and 50 g (50 ml, about 1.7 fl oz) water is a standard feed. Expect it to be sluggish for the first feed and normal by the second.
If it smells overwhelmingly like acetone and the paste has gone thin and gray, do two feeds 12 hours apart at 78°F (26°C) before you judge it. Most starters people declare dead are just two feedings behind.
The real fix: it's asking for more food
Hooch isn't a problem to manage, it's a signal that your feeding schedule doesn't match your kitchen. Three ways to change that, in order of how much they help:
1. Feed more often. At 70°F (21°C) a 1:1:1 feed lasts roughly 12–24 hours before hooch starts appearing. At 78°F (26°C) that drops to 8–12 hours. At 85°F (29°C) it can be 6. If you're getting hooch every day, you're feeding once a day in a kitchen that needs twice.
2. Feed a bigger ratio. More flour per gram of starter means more food and a longer runway. Instead of 1:1:1 (20 g starter, 20 g flour, 20 g water), go 1:5:5 (20 g starter, 100 g flour, 100 g water) and it will comfortably last twice as long. This is the single best fix if you want to keep feeding once a day.
3. Move it somewhere cooler. Fermentation roughly doubles in speed for every 17°F (9°C) of warmth. A starter on top of the fridge at 80°F (27°C) is burning through food twice as fast as the same starter in a cupboard at 66°F (19°C). Moving the jar is free.
Whole grain flours also feed a starter harder than white, so a 25% rye blend holds out longer than all-purpose.
The fridge case
This is where most people meet hooch for the first time, and it's the most benign version of it.
In the fridge at 38–40°F (3–4°C), yeast activity slows dramatically but doesn't stop, and the bacteria keep producing acid. Over one to three weeks the starter works through its flour, deflates, and separates. Come back to a jar with an inch of dark liquid on top and a gray paste underneath, and nothing has gone wrong. That's a stored starter behaving exactly as expected.
To wake it up: pour off or stir in, discard down to 20 g (0.7 oz), feed 1:5:5, and leave it at room temperature. It'll be lively on the second feed and ready to bake with on the third. Don't bake with a first feed straight out of cold storage.
To get less of it while stored, refrigerate the starter 2–3 hours after feeding, while it's still climbing rather than at peak. It goes into the cold with food still in the jar and lasts longer before separating.
Is it saveable?
Yes, essentially always. Hooch is the most reversible thing that can happen to a starter, and unlike almost every other sourdough problem it isn't even damage — it's a fermentation byproduct doing exactly what chemistry says it should.
The only genuinely unsalvageable starter is a moldy one, and mold looks nothing like this: raised, fuzzy, colored, sitting on the surface as a distinct colony. If that's what you have, the answer is different and it's on the mold page.
Otherwise: pour or stir, feed twice, and bake.
Something else wrong?
- Is this mold on my starter?
- My starter has bubbles but isn't rising
- My dough is too sticky to handle
- My loaf came out flat
- I got no oven spring
- My crumb is gummy
- My bread is dense
- My crust is hard, pale, or burnt
Start at the diagnosis hub if you're not sure which one you have.