Knead to Know #4: Hydration — Why Water Changes Everything

Not all water is the same......

Last week we got into baker's percentages — flour at 100%, everything else as a ratio. This week we're zooming in on the most important number on that list....Hydration.

Settle in, this is a LONG post.....

If gluten is the muscle of the loaf and flour is the foundation, water is what brings the whole thing to life. Adjust the hydration by ten percentage points and you don't just change the dough — you change the bread. Different crumb, different crust, different feel in your hand, different bite. Same flour. Same yeast. Same salt. Just more or less water.

Once you understand what hydration is doing in there, you stop guessing and start designing.

What Hydration Actually Means

In baker's percentage language, hydration is the weight of water as a percentage of the weight of flour. If a recipe calls for 500g of flour and 325g of water, the hydration is 65%. Simple math: 325 ÷ 500 = 0.65. That's it. Every bread on the planet sits somewhere on a hydration spectrum, and where it sits tells you more about the bread than almost anything else on the list.

A few benchmarks to anchor you:

• 55–60% — Bagels, pretzels, dense rolls. Stiff dough you can almost knead with one hand.

• 62–68% — Sandwich bread, baguettes, most everyday loaves. Workable, predictable, friendly to home bakers.

• 70–75% — Country loaves, rustic boules, most artisan breads. Softer, slacker dough. More open crumb.

• 78–85% — Ciabatta, focaccia, high-hydration sourdough. Wet, sticky, almost batter-like in places. Big, glossy holes when it bakes.

• 85%+ — Specialty wet doughs (some panettone, certain ciabattas). Pour-it-into-the-pan territory. Pros only.

Most home recipes live in the 62–68% range because it's the easiest to handle. There's nothing wrong with that. But if you've ever wondered why your bread doesn't look like the bakery's, hydration is usually a big part of the answer.

Why More Water = More Open Crumb

Here's what's actually happening in there. Water does two things in bread dough. First, it activates the gluten — proteins can't link up into a network without water present. Second, it creates the steam that puffs the crumb open during baking. The more water in the dough, the more steam-driven expansion you get inside the loaf, which means bigger, more irregular air pockets when it cools. That's the look. Glossy, holey, irregular — that's high hydration.

Lower hydration doughs hold their shape better and produce a tighter, more uniform crumb. Sandwich bread is meant to be sliceable and predictable, so it lives in the 62–65% range. A ciabatta is meant to be airy and chewy with massive holes, so it lives at 80%+. Neither is "better." They're tools for different jobs.

Why Wet Doughs Are Harder

Adding water sounds simple. Handling the result is not.

A 65% dough kneads cleanly, holds its shape on the counter, and shapes into a smooth ball without a fight. A 78% dough sticks to everything, slumps when you turn your back, and doesn't want to tighten up no matter how many times you fold it.

Three things change when hydration goes up:

1. The dough gets sticky. Wet hands beat dusted hands. Flour on the work surface absorbs into the dough and changes the hydration on the outside, making it tougher to handle as you go. A wet bench scraper is your best friend here.

2. Gluten development takes longer. Wet doughs benefit from time more than from kneading. Stretch and folds (turning the dough every 30–45 minutes during bulk fermentation) build strength gradually without fighting the wet structure. Old-school knead-it-on-the-counter doesn't work the same way.

3. Shaping is gentler. You can't muscle a wet dough into a tight ball. You shape with quick, confident moves and let the dough rest between steps. Overworking it tears the gluten and lets the gas out.

The good news: every one of these skills is learnable. Wet doughs feel impossible the first three times you try. By the fifth, your hands know what's happening. By the tenth, you stop dusting flour everywhere and the dough listens to you.

Flour Matters Here Too

Not all flour drinks water the same way.

Bread flour (higher protein, ~12–14%) absorbs more water than all-purpose flour. Same recipe, same hydration on paper, but a higher-protein flour will feel firmer because more water is bound up in the gluten network.

Whole wheat drinks water differently again. The bran absorbs water slowly, so a whole wheat dough that feels right at mix-time often feels stiffer 20 minutes later as the bran fully hydrates. Most whole wheat formulas run 5–10% higher in hydration than their white-flour equivalents to account for this.

Older flour (sitting in the pantry for months) absorbs less water than fresh-milled flour. Humid kitchens can shift hydration too — flour pulls moisture out of the air on a muggy day. Small variables, but they add up.

This is why two bakers with "the same recipe" can end up with different doughs. The recipe didn't lie. The flour did.

Tap, Well, RO — Water Isn't Just Water

Flour isn't the only ingredient with a personality. The water you mix into your dough is doing more than wetting the flour — it's bringing minerals, pH, and sometimes chemicals to the party. The dough notices.

Tap water. The default, and usually fine for commercial-yeast breads. The catch is chlorine and chloramine. Most municipal water is treated with one or the other to keep it safe to drink. Chlorine is mild and will evaporate if you leave water sitting uncovered in a pitcher for 30 minutes. Chloramine doesn't evaporate — it needs an activated-carbon filter (Brita, fridge filter, under-sink unit) or a campden tablet to break down.

For commercial-yeast bread, you can usually get away with tap straight from the spigot. The yeast is dosed high enough to power through whatever's in the water. Sourdough is a different story. A wild starter is a fragile little ecosystem of yeast and bacteria, and chlorinated or chloraminated water will slow it down or kill it outright. If your starter is sluggish and you're using straight tap, that's the first thing to fix.

Well water. Highly variable. Could be perfect, could be a problem. Three things to check.

• Hardness — the calcium and magnesium content. Hard water is actually good for bread. Yeast uses the minerals to thrive, and the calcium tightens the gluten in a useful way. Most well water in our part of Michigan sits in the moderately-hard range and works beautifully for bread. Too soft (rare) and your dough goes slack and sticky for no obvious reason. Too hard (also rare) and the gluten over-tightens.

• 🚫 Water softener — the silent killer. This is the one most home bakers don't see coming, and it's a HUGE one. A whole-house water softener works by replacing the calcium and magnesium in your water with sodium. The result is "softened" water that has way more sodium than yeast can tolerate — and sodium at high enough concentrations kills yeast outright. If your house has a softening system, NEVER use the softened water for bread. Bypass the softener, most outside hose spigots are off the well line, or use bottled (mineral or spring, NOT distilled) water for the dough. This is one of the most common reasons home bakers can't get a starter going or end up with flat, dense loaves they can't explain — they're literally killing the yeast every time they mix. If you've been fighting your bread for months and your house has a softener, this is almost certainly the answer.

• Off-flavors — sulfur (rotten-egg smell) and iron (rusty tint, metallic taste) ruin bread flavor. Both are filterable, but you'll know within a few loaves if you have a problem. If you do, install a carbon-plus-mineral filter or use bottled (again, mineral or spring, NOT distilled) water for the dough until you fix the source.

RO (Reverse Osmosis) water. This is the one that surprises people. RO strips almost everything out of the water — minerals, chlorine, contaminants, all of it. Sounds great. But yeast and gluten need those minerals to do their work. Mix a sourdough starter with pure RO water and it'll struggle. Mix commercial-yeast bread dough with it and you'll often get a slack, lifeless dough that doesn't develop the way you expect.

If RO is what you've got, it may still work — you just need to put a little something back. A pinch of fine sea salt in the water (in addition to the salt in your formula), or swap in spring water or bottled mineral water for sourdough builds. The yeast will thank you.

Quick troubleshooting test: if your bread has been "off" for a while and you've changed nothing else — same flour, same recipe, same yeast — check the water. New filter on the fridge? New house? New water softener installed? It's almost always something quiet you didn't think to question.

How to Adjust Hydration With Intention

Once you can read a formula in baker's percentages, you can shift hydration on purpose to change the bread. Want a softer, more open crumb in your sandwich bread? Bump from 65% to 68% and see what happens. Want a chewier ciabatta? Push from 75% to 80% and adjust your shaping technique. Want to figure out why one of your loaves is dense? Walk back through the formula — is the hydration low for the flour you're using? Is the bran in your whole wheat tightening it up? Hydration is the dial that does the most work in a bread formula. Learn to turn it on purpose and you stop being a recipe-follower and start being a baker.

The Takeaway

Water is not just an ingredient. It's the variable that controls the texture of the bread, the openness of the crumb, the chew of the crust, and how the dough behaves in your hands. Every other percentage on the list matters, but hydration is the one that most directly shapes what comes out of the oven.

Next week we get into mixing and autolyse — what happens in the first ten minutes after flour and water meet, why some bakers let it rest before kneading, and whether you actually need a stand mixer to get good bread.

See you then.

— Chef Keegan and The Lakehouse Bakery Team