Wet Spots in Sourdough Crumb: Fermentation or Mixing?

Short answer: wet spots are usually pockets where ingredients didn't mix evenly — concentrated water, salt-free zones, or under-incorporated starter. Mix more thoroughly to fix it.

What "wet spots" look like

You slice into your loaf and find:

• One area of dense, gummy crumb
• A water-soaked-looking patch
• A pocket the size of a golf ball with no air

The rest of the crumb is normal.

This is different from a fully gummy interior (which is under-fermentation). Wet spots are localized.

The 4 causes ranked

1. Uneven hydration

If your mix is rushed or your starter doesn't fully blend in, you can get pockets where:

• Some areas have 80% hydration
• Other areas have 65%

The high-hydration pockets ferment differently and bake into wet spots.

Fix:

• Mix until the dough is uniform — no streaks, no dry crumbs
• Use the slap-and-fold or stretch-and-fold method to ensure full incorporation
• Don't rush the autolyse; give the flour time to absorb water

2. Wet inclusions

Olives, sun-dried tomatoes, roasted vegetables, and even cheese can release liquid into the dough during the bake. The dough around them gets gummy.

Fix:

• Drain all inclusions thoroughly
• Pat olives and tomatoes dry with a paper towel
• Roast vegetables ahead and let them cool fully
• Add inclusions during a fold, not the initial mix

3. Cold dough

If the dough sat in a draft, the outside is room temperature but the center stays cold. When you bake:

• Outside ferments and bakes evenly
• Center finishes underproofed and underdone

This shows up as a wet spot in the center.

Fix:

• Keep dough in a draft-free area during bulk
• Don't rest dough on cold marble or stainless steel
• Use a proofing box or oven with light on

4. Lamination tear

If you laminated and stretched too thin, you can tear the gluten in spots. Those spots collapse during proof and bake into wet patches.

Fix:

• Stretch lamination evenly, no thin spots
• Stop stretching when you see translucency
• Don't laminate every fold — once mid-bulk is enough

The visual test

Cut your next loaf into 10 thick slices. If you see:

• Wet spots in 1–2 slices: mixing issue (localized)
• Wet spots in most slices: fermentation issue (whole loaf)
• Wet spots in same place every bake: shaping or mixing technique creates it consistently

The pattern reveals the cause.

A reliable mixing approach

For a 1kg dough:

1. Mix flour and water with a spatula in the bowl
2. Squeeze the dough between your fingers for 30 seconds
3. Add starter, mix until incorporated (60 seconds)
4. Add salt, dimple in, mix until disappeared (60 seconds)
5. Slap and fold for 5 minutes (or do 4 folds in the first 2 hours)

If you mix this thoroughly, hydration will be even. Wet spots won't appear from mixing.

When wet spots are fermentation

If wet spots appear at random positions in different bakes, the underlying problem is fermentation:

• Bulk too short (areas where gas didn't develop fully)
• Levain not at peak (uneven distribution)
• Low gluten development (areas where dough collapses)

These show up as inconsistency. Fix the fermentation and they go away.

Salt distribution

A wet spot near a missing-salt zone is common. Salt slows fermentation; without it, an area ferments faster, over-proofs, and collapses into a wet spot.

Mix salt thoroughly. Don't add salt as a sprinkle on top of the dough; dimple it in or pre-mix with water.

Cold dough from the fridge

Fresh-out-of-fridge dough is colder in the center than the edges. If you score and bake immediately:

• Edges ferment in the oven heat
• Center stays cold longer
• Center can end up underdone (wet spot)

Fix: let cold dough sit at room temperature for 30 minutes before baking, OR bake longer to compensate.

A wet-spot-free recipe

For a simple, reliable bake:

• 500g bread flour
• 350g water (70%)
• 100g starter, peaked
• 10g salt

Method:

• Mix all ingredients, slap-and-fold 5 min (no inclusions)
• Bulk 5h at 75°F, 4 folds
• Shape, cold retard 12h
• Bake at 475°F

This loaf has no wet spots if mixed thoroughly. Once you've made it 3 times without issue, layer in inclusions one at a time.

Wet spot near the bottom

A wet spot at the very bottom of the loaf is usually a Dutch oven issue (cool bottom). See the cooked-bottom troubleshooting article for that fix.