It tasted like it was just filtered through an athletic sock worn for back to back games on a humid July day, then filled with coffee grounds and a cup of ‘coffee’ brewed from it.  Years later I still remember this as the worst cup of coffee in my life.  It was a restaurant chain I had eaten at before, a brand of coffee pods I was familiar with.  But what was different.  Years later I realized – the filtered water they used to brew the coffee.  Since coffee is 98% water, if the water doesn’t taste good to drink on its own, it’s highly unlikely it will create good coffee. 

Using filtered water for coffee is one of the easiest ways to make your morning cup taste better. Coffee is mostly water, so the water you use can have a big effect on the flavor.

Even amazing coffee beans can taste flat, bitter, or strange when your water has too much chlorine, a strong mineral flavor, or an unpleasant smell.

The good news? You do not need fancy equipment or a science degree to improve your brewing water. A simple water filter may help your coffee taste cleaner, sweeter, and more balanced.

At Philly Fair Trade Roasters, we carefully source Organic, Fairtrade coffee and roast it in small batches. Good water helps all that natural flavor make its way into your mug.

Better water deserves better coffee. Explore our fresh-roasted Organic, Fairtrade coffees and give your next cup the clean, full flavor it deserves.

Shop Organic, Fairtrade Coffee

Why Does Water Matter So Much in Coffee?

Water may not be the most exciting part of your coffee routine, but it does most of the work.

A finished cup of drip coffee is about 98% water. That means the taste, smell, and mineral content of your water can change the flavor of your coffee.

During brewing, hot water pulls flavor from the coffee grounds. It collects natural sugars, oils, acids, caffeine, and aromas. This process is called extraction.

When extraction goes well, your coffee can taste sweet, smooth, and full of flavor.

When something goes wrong, your coffee may taste:

• Sour
• Bitter
• Weak
• Flat
• Dull
• Different from what you expected

Your coffee beans matter.

Your grind matters.

Your coffee-to-water ratio matters.

But your water matters too. 

All other aspects of your coffee can be dialed in, but it’s tough to get the win if your water tastes south of awesome by itself. 

Think of water as the delivery truck for coffee flavor. You want it clean, dependable, and ready to do its job.

Is Filtered Water Better for Coffee?

For many people, yes.

Filtered water may improve your coffee when your tap water has a strong smell or flavor. This may include chlorine, metal, minerals, or a musty odor.

A filter can reduce some of those unwanted flavors. That means you get to taste more of the coffee and less of the water.

This does not mean all tap water makes bad coffee. Some homes already have clean-tasting tap water that works very well for brewing.

Here is an easy rule to remember:

If you would not enjoy drinking the water by itself, you probably will not enjoy coffee made with it.  Remember the sweaty sock coffee from the beginning of our story?  The water was not enjoyable to drink on its own either.  So, no surprise the coffee was far from amazing. 

Filtered water is worth testing when your coffee:

• Tastes or smells like chlorine
• Has a metallic flavor
• Smells unusual before brewing
• Tastes different from one day to the next
• Seems dull even when the beans are fresh
• Leaves a lot of white buildup in your coffee maker
• It never tastes as good as it does somewhere else

Your coffee should taste like coffee, not a swimming pool, a handful of pennies, or anything else that does not belong in your mug.

What Does a Water Filter Remove?

That depends on the type of filter you use.

Many basic water filters use activated carbon. This type of filter is made to improve the taste and smell of water. It may reduce chlorine and other things that create unwanted flavors.

However, a basic filter may not remove every mineral or substance in the water.

When shopping for a filter, look for one that is tested and certified for improving taste and odor. You may see NSF/ANSI Standard 42 listed on the package as one of the options. 

Here are a few common filtering options.

Filtered Water Pitchers

Filtered water pitchers are affordable, easy to find, and simple to use.

They are a great starting point if you want to compare tap water with filtered water for coffee.

Keep the pitcher clean and replace the filter as directed. An old filter may not work as well and can lead to uneven results.

PS – these can even be convenient for travel to keep your coffee awesome even when you’re away from home.

Refrigerator Filters

A refrigerator filter is convenient if your fridge already has a water dispenser.

Just remember to change the filter on time. Refrigerator filters are easy to forget because you cannot always see them.

If you cannot remember the last time, you changed yours, it may be time to check.  About every six months seems to be a good starting point for most filters. 

Faucet-Mounted Filters

These filters attach to your kitchen faucet. They usually allow you to switch between filtered and unfiltered water.

A faucet filter may be useful if you brew several pots of coffee each day and do not want to keep filling a pitcher.

Under-Sink Carbon Filters

Under-sink filters usually hold and filter more water than pitchers or faucet filters.

They may be a good choice for:

• Larger families
• Coffee-loving households
• Small offices
• People who brew several times each day

Reverse-Osmosis Systems

Reverse osmosis systems can remove many dissolved substances from water.

However, they may also remove most of the natural minerals. That is not always ideal for coffee.

Some reverse-osmosis systems add minerals back into the water afterward. This is called remineralization.

If you already have a reverse-osmosis system, check whether it includes this feature.

You can also buy remineralization packets to add minerals back into your coffee if needed.

Does Coffee Need Minerals in the Water?

Yes, a small amount of mineral content can be helpful.

Water naturally has minerals and other dissolved materials. The total amount is often called total dissolved solids, or TDS.

A TDS meter can tell you how much dissolved material is in the water. However, it cannot tell you exactly what those materials are.

Two glasses of water may have the same TDS reading but have different minerals. They may also produce coffee that tastes very different.

Minerals like calcium and magnesium can affect how water pulls flavor from coffee grounds.

Another factor is alkalinity. Alkalinity affects how the water reacts with the natural acids in coffee.

That may sound a little technical, but do not worry. You do not need to test every mineral before making breakfast.

For most home brewers, good coffee water should:

• Be safe to drink
• Taste clean
• Have no strong smell
• Have some natural minerals
• Avoid creating too much scale
• Produce coffee you enjoy

Coffee should be fun—not a chemistry test before sunrise.

Should You Use Distilled Water for Coffee?

Distilled water has very few minerals.

That may sound perfect because the water is very pure. However, distilled water is not usually the best choice for everyday coffee brewing.

Some minerals help water pull flavor from coffee grounds. Without them, your coffee may taste:

• Thin
• Flat
• Sharp
• Weak
• Less flavorful

Some coffee experts start with distilled water and add specific minerals back into it (the packets referenced earlier as an example). That can work well, but it is more effort than most people need.

For everyday brewing, filtered water that still has some natural minerals is usually the easier choice.

Use distilled water when:

• Your coffee maker specifically needs it
• You are following a tested coffee-water recipe
• You plan to add minerals back into the water

Otherwise, start with clean, carbon-filtered water.

What About Bottled Water?

Bottled water can make good coffee, but every bottled water is different.

Spring water, purified water, mineral water, and distilled water are not the same.

One brand may help your coffee taste bright and lively. Another may make the same coffee taste flat or dull.

Avoid bottled water with a strong mineral flavor. You also do not need expensive water shipped from the other side of the world.  Again, if the water is not enjoyable on its own, it’s probably not going to make good coffee. 

When traveling, bottled spring water can be helpful if the local tap water tastes or smells strange. Look for water that tastes clean and neutral on its own.

Can Hard Water Damage a Coffee Maker?

Hard water has higher levels of minerals like calcium and magnesium.

These minerals can leave a white, chalky buildup inside:

• Coffee makers
• Kettles
• Espresso machines
• Water tanks
• Small tubes and openings

This buildup is called scale.

Over time, scale may:

• Slow down water flow
• Change the brewing temperature
• Block small openings
• Make heating less efficient
• Cause the machine to work harder
• Shorten the life of some parts
• Make you descale the machine more often

A basic carbon filter can improve taste and smell, but it may not remove enough minerals to solve a serious hard-water problem.

If you see a lot of white buildup, look for a filter made to reduce water hardness. You may also need a larger home water-treatment system.

Always follow the cleaning and descaling directions for your coffee maker.

A clean machine is a happy machine—and a happy machine makes better coffee.

How to Test Filtered Water for Coffee at Home

You do not need special tools to test your water.

A simple side-by-side taste test can tell you a lot.

Step 1: Prepare Two Water Samples

Fill one glass with your usual tap water.

Fill another glass with freshly filtered water.

Let both samples reach room temperature. Cold water can hide some tastes and smells.

Ask yourself:

• Does either sample smell like chlorine?
• Does one taste metallic?
• Does either one have a musty or earthy flavor?
• Does one taste cleaner?
• Which one would you rather drink?

Step 2: Brew the Same Coffee Twice

Use the same:

• Coffee beans
• Grind size
• Amount of coffee
• Amount of water
• Water temperature
• Brewing method
• Brew time

The only thing you should change is the water.

This helps you see whether filtered water really makes a difference.

Need help keeping your brewing recipe consistent?
[Read Our Coffee-to-Water Ratio Guide]

Step 3: Taste the Coffee Side by Side

Let both cups cool for a few minutes before tasting them.

Coffee flavors are often easier to notice as the coffee cools.

Compare the two cups for:

• Aroma
• Sweetness
• Acidity
• Bitterness
• Body
• Aftertaste
• Overall flavor

You may notice that filtered water makes the natural tasting notes easier to find.

You may also discover that your tap water already works well.

Either way, you learned something useful—and you got to drink two cups of coffee. That sounds like a pretty good experiment to us.

Ready to test the difference for yourself? Brew the same coffee with tap water and filtered water, then compare the flavor side by side.

Need a fresh coffee for the experiment?

Explore Our Fresh-Roasted Coffees

Filtered Water for Different Brewing Methods

Filtered water can help with almost any brewing method.

However, some methods make water problems easier to notice.

Drip Coffee

Automatic drip machines use a lot of water. That means chlorine or mineral flavors may stand out in the final cup.

Filtered water is one of the easiest ways to improve coffee from a standard drip machine.

Pour-Over Coffee

Pour-over brewing is great for showing off the natural flavor of a coffee.

Clean water may help you notice flavors like:

• Chocolate
• Fruit
• Citrus
• Caramel
• Nuts
• Flowers

Poor-tasting water can cover up those flavors.

French Press

French press coffee usually has a heavy, full body because it uses a metal filter.

If the water also has a strong flavor, the finished coffee may taste too heavy or unpleasant. Neutral-tasting filtered water can help create a cleaner cup.

Espresso

Espresso machines can be very sensitive to water quality.

Hard water may cause scale. Water with almost no minerals may also create problems in some machines.

Water can affect:

• Flavor
• Extraction
• Water flow
• Machine care
• Long-term performance

Before changing the type of water you use, check your espresso machine’s instructions.

Cold Brew

Cold brew coffee sits in water for many hours.

That gives the water plenty of time to affect the flavor. Clean-tasting filtered water can help cold brew taste smooth, sweet, and refreshing.

Because cold brew is often enjoyed black or with only a little milk, unwanted water flavors may be easier to notice.

Five Simple Water Tips for Better Coffee

We’re brewing coffee, not building a rocket ship. 

Start with these five easy habits:

1. Use cold, fresh water.
   Do not use water that has been sitting in your kettle overnight. Start fresh.
2. Filter water that tastes or smells strange.
   A basic carbon filter may make a noticeable difference.
3. Change your filter on time.
   Write the replacement date on the filter or add a reminder to your phone.
4. Keep your coffee maker clean.
   A clean water filter cannot fix a dirty water tank or coffee machine.
5. Descale your brewer when needed.
   Follow the manufacturer’s directions, especially when you see white mineral buildup.

Small changes. Better flavor. Good-day energy.

Frequently Asked Questions

Is Tap Water Okay for Making Coffee?

Yes. Tap water can work well when it is safe to drink and tastes clean.

If your tap water tastes like chlorine, metal, minerals, or earth, try filtered water and compare the two cups.

What Is the Best Filtered Water for Coffee?

For most home brewers, carbon-filtered tap water is a good choice.

The water should taste clean while still having some natural minerals.

The best water is the one that:

• Makes coffee you enjoy
• Does not have a strong taste or smell
• Does not create too much buildup in your machine

Does a Water Filter Make Coffee Less Bitter?

It may help if the bitter flavor is coming from chlorine, odors, or a heavy mineral taste.

However, bitter coffee can also be caused by:

• Grinding too fine
• Brewing too long
• Using too much coffee
• Using water that is too hot
• Leaving the coffee on a hot plate too long

[Learn More: Why Does My Coffee Taste Bitter?]

Can I Use Refrigerator-Filtered Water for Coffee?

Yes. Refrigerator-filtered water can work very well for coffee.

Make sure the filter has been changed on time and the water tastes fresh.

Your coffee maker or kettle will heat the cold water, so you do not need to let it warm up first.

Is Purified Water the Same as Filtered Water?

Not always.

Filtered water has passed through a filter that removes or reduces certain materials.

Purified water usually goes through a stronger treatment process that removes more dissolved material.

Check the label or filter information to learn how the water was treated.

How Often Should I Change My Water Filter?

Follow the instructions from the filter company.

How long a filter lasts may depend on:

• How much water you use
• The quality of your local water
• The size of the filter
• The type of filtering system

Do not wait until your water starts tasting strange again.

Final Sips on Filtered Water for Coffee

Filtered water cannot turn stale or poorly roasted coffee into an amazing cup.

But when you start with fresh, carefully roasted beans, good water can help you taste more of the flavor already inside them.

This is especially helpful with specialty coffees that naturally taste like:

• Chocolate
• Berries
• Citrus
• Nuts
• Caramel
• Flowers
• Tropical fruit

These flavors are not added to the coffee.

They come naturally from the coffee variety, growing region, processing method, and roast.

At Philly Fair Trade Roasters, we source Organic, Fairtrade coffee and roast it in small batches. This helps your coffee arrive fresh and full of natural flavor.  Always roasted for awesome, nothing artificial added. 

Give those beans clean, balanced water, and let them shine.

A better morning does not need to be complicated.

Sometimes all you need is fresh coffee, filtered water, and your favorite mug.

It’s a good day to have a good day.

Start your next good day with a better cup. Choose your favorite Organic, Fairtrade coffee, select whole bean or a custom grind, and enjoy fresh-roasted flavor delivered to your door.

Shop Coffee

Free shipping is available on qualifying orders over $40, or choose Subscribe & Save for easy recurring deliveries.

📚 Recommended Reading

Keep growing your coffee knowledge with these helpful articles:

Brewing & Coffee Education

• How to Store Coffee Beans for Maximum Freshness
• Coffee-to-Water Ratio: Brew Better Coffee Every Time
• Best Coffee Brewing Temperature Explained
• How to Make Coffee Without a Coffee Maker
• French Press Coffee Guide for Beginners

Join Our Coffee Community

Love learning about coffee?  Sign up in the footer.

Join our email newsletter for weekly brewing tips, coffee education, farmer stories, new coffee releases, and exclusive offers.

From our roaster to your morning routine—we're here to help make every cup, and every day, a little better. ☕