Can You Brew Beer with Softened Water? | Brewing Water Guide

Can You Brew Beer with Softened Water?

Many homebrewers want to brew beer using tap water for convenience. But if your home has a water softener, you might be wondering:

Will softened water ruin your beer, or can you still use it to brew?

The answer depends on your sodium levels, mineral profile, and beer style.

How a Water Softener Changes Your Brewing Wate

Hard water contains high levels of calcium and magnesium. An standard water softener removes these minerals and replaces them with sodium. This is called an Ion-Exchange System.

After softening, your water will typically have:

Lower calcium
Lower magnesium
Higher sodium
Reduced hardness

These changes can affect mash pH, yeast health, and beer flavor.

Is Softened Water Good for Brewing Beer?

Softened water can be used for brewing, but only if the sodium level and mineral content are within acceptable ranges.

Sodium in Brewing Water

Sodium does not usually harm fermentation, but too much can cause:

Salty Beer (No one wants that unless it’s a Gose!)
Harshness when combined with sulfate
Bitter Flavors

Sodium Targets are typically:

0–150 ppm sodium.
A minimum of 50 pmm can enhance flavor in some styles
A maximum of 100 pmm can be used as a safety margin.

If your water tastes salty after softening, that flavor will carry into your finished beer.

For competitive or commercial brewing, testing sodium is essential.

Why Low Calcium and Magnesium Matter

Softened water removes calcium and magnesium that are essential to brewing and controlling mash pH.

Calcium Benefits

Calcium:

Helps control mash pH (it lowers residual alkalinity)

Improves clarity
Enhances finish and mouthfeel

Magnesium Benefits

Magnesium:

Supports yeast nutrition
Helps control mash pH (it lowers residual alkalinity)

Without enough of these minerals, you may experience:

Poor yeast health
Unstable mash pH
Thin or dull flavor profiles
Increased risk of off-flavors

Matching Water Chemistry to Beer Style

Different beer styles require different mineral profiles.

Light lagers → lower residual alkalinity
Hoppy beers → higher sulfate and calcium
Malty styles → balanced chloride and alkalinity

While you may be able to brew your style with incorrect alkalinity and hardness, it will lack some of the distinct flavor and may have off-flavors you didn’t intent. To brew consistently great beer, it’s vital you match water chemistry and style.

How to Test Softened Water for Brewing

The only way to know if softened water is suitable is testing your brewing water profile.

A complete brewing water test should measure:

Sodium
Calcium
Magnesium
Total hardness
Total alkalinity
Residual alkalinity

The CraftPro Brewmaster Test Kit measures all key minerals so you can determine whether your softened water is usable or needs adjustment.

For brew-day consistency, CraftPro Test Strips let you monitor hardness and confirm your softener is performing consistently from batch to batch.

What to Do If Softened Water Isn’t Suitable

If your sodium is too high or your mineral content is too low, you have several options.

Use Reverse Osmosis (RO) Filtration

RO systems can remove sodium and most other minerals, giving you a clean base for building a custom water profile.

Important notes:

RO does not always reduce all minerals to zero
Filter performance declines over time
Periodic testing is recommended, even just DIY Testing to monitor your filter

After RO, you’ll need to add brewing salts to reach your target profile.

Dilute with Distilled or RO Water

Dilution lowers sodium and other concentrations while keeping some original minerals.

This is a cost-effective method for homebrewers who don’t want to fully rebuild their water profile. Click Here to read our article about dilution and learn how to do it for yourself.

Buy Distilled or RO Water

Store-bought distilled or RO water provides a blank slate, allowing you to build a precise water profile for any beer style.

This adds cost but offers maximum control and repeatability.

Can You Brew Great Beer with Softened Water?

Yes, but only if you test and adjust it.

Softened Water depends on your settings and the hardness of the starting water source. But if you monitor it, you can brew great beer with it. Several of our team members have used it in their own homebrewing with success.

It’s important to test:

Sodium level
Calcium and magnesium concentrations
Hardness and alkalinity

Without testing, you’re brewing blind.

Best Practice for Homebrewers

Test your softened water
Compare results to your target beer style
Adjust with dilution, RO, or brewing salts
Monitor hardness regularly for consistency

This ensures repeatable water chemistry and better beer.

FAQ: Brewing with Softened Water

Is softened water bad for homebrewing?

Not necessarily. It can be used if sodium is within range and minerals are adjusted.

What sodium level is too high for brewing beer?

Above 150 ppm can cause salty or harsh flavors.

Do I need calcium in brewing water?

Yes. Calcium helps control mash pH, improves clarity, and supports yeast performance.

Should I use RO water instead of softened water?

RO is often preferred because it gives you full control over your brewing mineral profile.

How do I know if my water is good for brewing?

You need a CraftPro brewing water test kit to measure sodium, hardness, alkalinity, calcium, and magnesium.

Sodium and your brewing water

Many brewers worry that using softened water might ruin their beer. But how exactly does sodium interact with your brew—and what levels are considered appropriate?

How does Sodium affect your beer?

Unlike many other water parameters, sodium doesn’t typically impact the fermentation process directly. However, when used in the right proportions, sodium can enhance the flavor, fullness, and mouthfeel of your beer—much like salt in food.

That said, too much sodium can lead to a salty or even harsh, bitter flavor that’s off-putting.

Sodium Amounts in Brewing Water

Brewers typically target 0 to 150 ppm of sodium in their brewing water, but it’s important to consider how sodium interacts with other minerals—particularly sulfate. When both sodium and sulfate levels are high, the perceived bitterness can intensify to unpleasant levels.

Due to this complexity, many brewers cap sodium at 100 ppm to avoid any unwanted harshness or saltiness.

Most commercial beers include some sodium—usually around 50 ppm—to subtly enhance flavor.

Even in beers designed with elevated sodium in mind, brewers rarely exceed 250 ppm, especially when sulfate levels are low. This is generally considered the upper limit for sodium in brewing water.

What about salty styles of beer?

Some beer styles intentionally aim for a touch of saltiness. In these cases, brewers may use 50–150 ppm of sodium in their brewing water, then add additional sodium after fermentation to fine-tune the final taste. This post-fermentation addition allows for precise control without impacting the mash or fermentation process.

Testing your water’s sodium levels

To determine the sodium concentration in your water, you should use the CraftPro Master Brewer’s Test Kit.

The CraftPro In-Lab test kit will let you send in a sample to our laboratory to have it tested for sodium and 14 other parameters that are critical to brewing such as magnesium, chloride, and sulfate. As well as two brewing specific calculations that affect your water profile.

The CraftPro Master Brewer’s Test Kit makes it easy to get your results. After you order your test kit you’ll get everything you need to collect a sample and send it to our lab. Once we analyze your sample, we’ll send you an easy-to-read, electronic report with exact concentrations and calculations done for your sample.

Is softened water suitable for brewing beer?

Many brewers avoid using softened water when brewing because of the low calcium and magnesium levels and the high concentration of sodium. But this isn’t always the case.

Water Softeners will remove different levels of minerals based on several factors, so some will be more aggressive than others. Water softeners also add sodium based on the starting hardness of the water, if the starting water is already soft then it may not be too high in sodium after softening.

Testing your water is the only way to know exactly what is being removed and added by a softener to ensure it’s suitable to brew with. But a good initial test for homebrewers is if the water has any saltiness to it after softening, it won’t be able to be brewed with at the current setting.

How to remove sodium from brewing water

Reverse Osmosis Filtration has become extremely popular in the brewing community. This is because it will take your water profile to a blank slate. This is an effective way to remove everything you do not want in your water, but it will also remove everything else.

If you are using a reverse osmosis filtration system, you will need to build your own water profile by adding the minerals back in. If you do not know where to start, you can look at our brewing profiles page to see what many popular brewing cities have as their default water.

Buying Distilled Water

If you do not want to install a filter or have access to one, but your sodium levels are too high to brew with, you can always buy RO or distilled water instead of filtering it yourself. This will be the same process as building back your own water profile with an RO system.

How to add sodium to your brewing water

To add sodium to your brewing water profile, standard table salt can be used. It is important to use non-iodized salt because iodine can harm your fermentation.

A rough rule to use is that 1 gram per gallon will increase the sodium concentration by approximately 100 ppm.

Conclusion:

Sodium levels in your brewing water profile can help highlight the flavor and mouthfeel of your beer. But in high concentrations it can become overly bitter and harsh, especially when paired with higher concentrations of sulfate.