What Is Hooch in a Sourdough Starter?
The short answer
If you have noticed a layer of liquid sitting on top of your sourdough starter?
Don’t panic—this is called hooch, and it’s very common.
Hooch is a liquid that forms when your sourdough starter has used up its food. It usually means your starter is hungry and ready for a feed.
Want to understand what’s actually happening?
Hooch shows up when the balance inside your starter starts to shift.
Your starter is a living culture made up of wild yeast and bacteria. When you feed it flour and water, those microorganisms eat the sugars in the flour and produce gas, acids and alcohol as part of fermentation.
When there’s plenty of food available, everything stays balanced and active.
But once the food starts to run low, the environment inside the jar changes. Liquid begins to separate and rise to the top.
That liquid is what we call hooch.
So really, hooch is just a sign that:
your starter has worked through its last feed
What it means (and what it doesn’t mean)
Hooch can look a bit concerning if you’re new to sourdough, but it’s important to separate signal from noise.
It does not mean:
-
your starter is dead
-
your starter is ruined
-
you’ve done something wrong
It usually means:
-
your starter is active
-
it has used up its food
-
it needs a fresh feed
In many cases, a starter producing hooch is actually quite strong—it’s just working faster than the feeding schedule.
What it can look like
Hooch isn’t always the same.
You might see:
-
a thin clear liquid
-
a grey layer
-
a brown or dark liquid
The darker it is, the longer it’s usually been sitting between feeds.
All of these are normal.
What to do next
You’ve got two simple options:
Stir it in
Mix it back through before feeding.
This keeps everything in the culture and often produces a slightly more tangy starter.
Pour it off
Discard the liquid before feeding.
This can make the starter a little milder.
Neither is right or wrong—it comes down to preference.
If you keep seeing hooch
If it’s happening often, your starter is probably getting hungry before its next feed.
That usually comes down to:
-
not enough food at each feed
-
warm kitchen temperatures speeding fermentation
-
leaving too long between feeds
It’s not something to panic about—it just means your timing or ratios need adjusting.
When to actually worry
Hooch alone is never a problem.
The only time I’d step back and reassess is if you also see:
-
fuzzy mould (any green, pink, orange or black growth)
-
a truly rotten, putrid smell that doesn’t improve after feeding
Otherwise, it’s almost always manageable.
Nikki’s note
Hooch is one of those things that looks more dramatic than it is.
In practice, I see it most often in active starters that are simply a little overdue for a feed.
It’s not a warning sign—it’s feedback.
Your starter is basically telling you:
“I’ve used this up. Feed me again.”
👉 Why Is My Crust Too Hard?
👉 Why Is My Bread Gummy Inside?
👉 How Do I Make Sourdough Fit Real Life?