Is it safe to use a very sour starter?

Yes, it is safe but will produce very sour bread. The high acidity means the yeast may be sluggish, so bread may not rise as well.

What does hooch mean?

Hooch is the dark liquid that forms on neglected starter. It is alcohol produced by yeast. Pour it off or stir it in, then feed the starter.

How do I get less sour bread?

Use starter at peak before it becomes too acidic, ferment at cooler temperatures, and reduce fermentation time.

Starter Too Sour

Starter

An extremely sour or alcoholic-smelling starter has been underfed and the bacteria have dominated over yeast. The good news is this is easily fixed with more frequent feeding.

Try This Right Now

1Discard most of the starter, keeping only 1-2 tablespoons
2Feed with a larger ratio of fresh flour (1:5:5 or 1:10:10)
3Feed twice daily until smell improves

Detailed Solutions

Aggressive Feeding

Easy

Dilute acidity with fresh flour.

Keep only 10-20g of starter
Feed with 100g flour and 100g water
This dilutes the acid significantly
Repeat every 12 hours

Cool Down

Easy

Lower temperature slows acid production.

Move starter to cooler spot (65-70°F)
Feed with cool water
Acid-producing bacteria prefer warmth
Balance will shift toward yeast

Why This Happens

Overly sour starter occurs when acid-producing bacteria outpace yeast, usually from infrequent feeding or warm temperatures. Contributing factors include: Feeding schedule too infrequent, Starter kept too warm, Using too little fresh flour per feeding, Starter past peak when used, High proportion of whole grain flour.

Prevention for Next Time

Feed starter before it collapses and becomes very sour
Use starter at peak (doubled, before it falls) for mild flavor
Store in refrigerator if not baking daily
Use cooler temperatures for less sour flavor profile

Related Issues

Having other problems? Check out these related troubleshooting guides.

Starter Not Rising Over-Fermented Dense Crumb No Rise