The 8 Best Water Filters for Coffee Brewing (2024)

Updated on:
March 6, 2024

Does your coffee taste bad? Or does it have an inconsistent flavor even when you use the same preparation method? It could be due to poor water quality that fails to bring out the best of what coffee has to offer. 

It’s not as simple as installing a heavy-duty water filter for clean water. Many studies suggest specific levels of total dissolved solids (TDS) levels and essential minerals are critical to brewing the perfect cup. 

Sound confusing? No worries. In this post, I’ve reviewed and tested the best water filters for coffee that can level up your coffee game in no time.

Let’s dive right in.

1. Waterdrop Reverse Osmosis G2P600 Water Filter: 9.70/10 

  • Best filtration 
  • $388.99

The Waterdrop Reverse Osmosis Filter is my top choice — a reliable, long-term solution that consistently delivers pure, crisp water and, ultimately, the perfect cup of coffee.


Waterdrop, a well-established American company, instills a sense of confidence in its products. And that’s exactly the kind of assurance you need when it comes to your daily dose of coffee. 

The Waterdrop G2P600 combines reverse osmosis technology with a tankless design, making it sustainable and effective. The filter system combines a sediment filter, an activated-carbon filter, and an RO membrane filter to separate water from impurities and reduce TDS levels. 

With an advanced filtration of 0.0001 microns, it can effectively trap sediment, rust, lead, salt, chlorine, fluoride, nitrate, and even bacteria and viruses. So, it’s a more practical solution for everyday kitchen use. My tests also showed significant improvement in water quality and taste. 

This combination of filters can also reduce heavy metal content to prevent scaling in coffee makers and espresso machines. 

Now, if you know anything about brewing coffee, essential minerals in water actually contribute to the flavor profile, and reverse-osmosis water or distilled water may just be too pure for tasty coffee. It’s a good thing that G2P600 features a “remineralization” filter that adds healthy minerals back into your drinking water. 

The Waterdrop RO filter system is compact and fits snuggly under the sink. It’s also easy to install. You can do it even without hiring any help.

It features a 0.42 gpm (gallons per minute) flow rate and takes just eight seconds to fill a cup. The filters have an impressive lifespan of one to two years, and a filter change takes only a few seconds, thanks to its user-friendly design. Additionally, the smart filter life indicators make the replacement process much easier.

The tankless design and premium technology enable a 2:1 pure water-to-waste ratio, which is exceptional considering others offer a 4:1 drain ratio. Compared to alternatives, like the Express Water filter, it’s much more efficient. 

All Waterdrop products are independently certified to NSF standards, which gives the end users peace of mind that the components are durable and high quality. Also, it’s made from BPA-free material. 

This Waterdrop RO filter system costs $388.88, and the replacements are priced at $140. It comes with a one-year warranty and free shipping. The brand also offers a 20% discount to first-time buyers. Considering its many features and quality, it’s a reasonable investment. 

Being an environmentally conscious person, I love the fact that Waterdrop is committed to eco-friendly practices. Other brands should take a page out of its book. 


Now, it’s true that the Waterdrop Reverse Osmosis Filter comes with a slightly higher upfront cost. However, the noticeable improvement in coffee taste and the minimal maintenance required truly make it a worthwhile investment for any serious coffee aficionado. A durable solution like the Waterdrop G2P600 really goes a long way.


The Waterdrop Reverse Osmosis Filter has impeccable filtration capability, effective remineralization, a long lifespan, and an ergonomic design, making it a reliable under-sink filter option for your drinking water needs.

If you want a long-term solution and a high-quality coffee brewing experience, buy this product here

2. Clearly Filtered Water Pitcher: 8.35/10

  • Best portable option
  • $81

My second pick is the Clearly Filtered Water Filter Pitcher. It’s extremely portable and easy to use. Considering its small size, the filtration is really impressive.


Convenience matters when choosing a water filter for something specific like coffee brewing. The Clearly Filtered Water Filter Pitcher stands out as the most feasible portable solution that doesn’t compromise on quality.

The filtration is thorough with a woven mesh, coconut granular carbon, and composite shell. My test results showed a significant decrease in impurities that can affect coffee’s taste, such as chlorine, fluoride, lead, glyphosate, and PFOAs.

Clearly Filtered’s water pitcher has a 10-cup capacity and a 100-gallon lifespan, about three to four months. The pitcher becomes heavy at full capacity, but the large ergonomic handle makes it easier to move around. It takes about 30 to 40 minutes for the complete reservoir to be fully filtered, so it’s best to keep it filled at all times, ensuring you have water ready to go whenever needed. 

The quality of the pitcher itself is noteworthy — it’s built to last and offers a handy design that fits seamlessly into your kitchen. Also, it’s independently certified against NSF standards and made from BPA-free material. 

Priced at $81 with replacements available at $49, the Clearly Filtered Pitcher offers a balance of performance and portability. The brand also offers free shipping and a lifetime warranty on the product. Additionally, you can take advantage of a 30-day free trial if you wish to test it yourself. 


While the Clearly Filtered Water Filter Pitcher offers many benefits, its replacement cost is relatively higher than some other pitchers. This is something to factor into your decision, particularly if cost-effectiveness is a primary concern.


The Clearly Filtered Water Filter Pitcher features an efficient three-stage filtration process that guarantees high-quality water. Also, its spill-free design and large reservoir make it ideal for brewing a big batch of coffee without the fuss of an entire point-of-use system.

The efficiency and dependable filtration make it a sound choice for those prioritizing clean water for their coffee rituals. Learn more about it here

3. Waterdrop WD-FC06 Faucet Filter: 7.60/10

  • Budget-friendly option 
  • $47.99

The Waterdrop faucet water filter is easy on the pocket, a breeze to install, and it cleans like nobody’s business — which is why I recommend this for all you caffeine connoisseurs out there.


The faucet-type filter is a good choice if you don’t have a budget to install Waterdrop’s RO filter, which I reviewed above. It’s a good point-of-use solution for renters or those who move often.

It’s small, compact, and easy to install. But size isn’t everything. This little giant packs a punch with its coconut (make sure you aren’t allergic) carbon-block filter media. You’re looking at chlorine, lead, sediment, rust, fluoride, and heavy metals effectively reduced in drinking water.

The Waterdrop faucet filter has a flow rate of 0.5 gallons per minute or 10 cups in a minute, which is decent. You can switch between tap and filtered water easily and adjust the flow angle any way you like. It can clean 320 gallons, which means you need to replace the old filter after three months. 

The outer body is made of stainless steel, while the insides are made from food-grade material. Also, the filter’s got an independent NSF certification, so you know it’s been put through its paces by the pros. 

The Waterdrop faucet water filter comes in at $47.99, and replacements are a mere $6 — so it’s pretty economical. You’ll also get a one-year warranty. 


Waterdrop’s faucet filter can only be installed on a standard faucet. Fancy, handheld, stylish, or spray-style faucets are incompatible. So, you may need to install a separate faucet for this filter. 

Another aspect to consider with the Waterdrop faucet water filter is that it doesn’t affect the TDS value, which represents the mineral content in water. If it’s higher than 400 ppm, then you’re better off installing under-sink or countertop filters. 


All in all, the Waterdrop WD-FC06 is worth the price. It’s a quick solution for quality coffee brews. The carbon-block filter effectively cleans tap water and requires minimum maintenance. You can find out more about this faucet filter here

4. Brondell Circle Reverse Osmosis Water Filter

Brondell’s Circle RO system is a stylish under-sink filter with a four-stage filtration process. It’s most suitable for heavy contamination. The four filters that do the heavy lifting are sediment, pre-carbon, post-carbon, and RO membrane filters. They target chlorine, lead, and heavy metals and reduce TDS levels effectively. 

It has a 1.6-gallon capacity with long-lasting filters for up to two years. The flow rate is comparable to high-performing RO filter systems. 

Unlike the Waterdrop G2P600, it doesn’t require electric power to function and comes with a designer faucet with an LED indicator. However, I ranked it lower because it doesn’t have a remineralization feature. A lack of essential minerals may hinder the taste of coffee. 

Even though it’s 10x more efficient than other nonelectric filters, it still wastes more water than electric ones, which is not eco-friendly. 

The quality is top-notch, and the brand has WQA gold certification for all of its products. And the installation is a breeze. No need to hire help. 

The Circle is priced at $449.49, and the replacement, on average, costs $169.98, which is the highest on my list.

5. ZeroWater Water Filter Dispenser 

ZeroWater is a reputable brand that produces efficient water filtration systems. 

The ZeroWater filter dispenser works similarly to pitchers, except it has a spout at the bottom so you don’t have to lift it. You can easily place it on the kitchen counter and enjoy clean drinking water, which is convenient for kids and the elderly, since pitchers can be really heavy to lift. It’s also compact enough to fit in your refrigerator.

The brand claims to have five-stage ion exchange filtration, which is pretty effective against sediment, chlorine, lead, PFOA, and bad taste and odor. It lasts for one to two months only, but the replacements are inexpensive.

It has a large capacity of 22 cups or 5.2 liters. However, its filtration rate is quite slow. It takes hours to fill the reservoir, so you better leave it overnight.

The Zerowater dispenser significantly reduces TDS levels and even comes with a TDS meter that monitors water quality. The built quality is good, and the product is NSF certified. 

It’s priced at $27.99, and replacements cost $15, which is quite reasonable. The brand only offers a limited warranty of 90 days.

6. iSpring CKC1C Countertop Water Filter

The iSpring CKC1C filter is a compact countertop option for high-quality drinking water. It utilizes a five-micron carbon filter, much like many others on my list, but it lasts longer, up to six months. You can trust the product quality is good because it’s NSF certified. 

This filter effectively removes the usual suspects from tap water, such as sediment, chlorine, rust, and lead. The installation bit can be tricky because it’s only compatible with standard faucets. So, you might need to change the faucet as well. 

Also, it’s not aesthetically pleasing. It sits near the faucet, occupying useful space, and the transparent casing makes the gunk trapped by the filter always visible. If you are picky about the overall look of your kitchen, then this may not be the right choice. 

The iSpring CKC1C is priced at $42.14, and replacements are $7, which is certainly one of the most inexpensive options on my list.

7. ‎Brita XL Water Dispenser

The Brita filter has a big and tall design that covers a lot of vertical space, especially in a fridge. The carbon filter is effective but not as good as the Clearly filtered and Zerowater filters. I noticed a reduction in sediment, chlorine odor, and taste, but it didn’t reduce the TDS level as much. 

The Brita water dispenser has a 120-gallon or 27-cup capacity, which is pretty decent. The filter, on average, lasts for two months. Replacing old filters is easy. Even though it’s a certified product, the built quality is lackluster. The outer body is fragile compared to other pitchers and dispensers I’ve reviewed. 

This Brita Water dispenser is priced at $37.99, and replacements are $4.46. The brand offers free shipping, but there is no mention of a warranty of any kind, which is disappointing considering its flimsy construction. 

8. ‎Express Water RO5DX Reverse Osmosis Filter

Lastly, we’ve the Express Water RO filter, which is good at removing contaminants from water, but it’s no match to Waterdrop when it comes to water purity. My testing showed diminishing water quality as the filter reached the end of its lifespan. The flow rate is decent; it can filter 50 gallons daily. 

It comes with a tank and three cartridge filters, so you need a big space under the sink to install it. Also, unlike the tankless Waterdrop and Circle RO filters, it wastes a lot of water. 

The poor drain ratio makes it less eco-friendly, which is why I ranked it lower. I want my conscience clear for my morning brew. 

The installation is a bit difficult, but the instructions manual is clear. The R05DX is priced at $169.99, and the replacements are $90. I’d recommend considering a slight budget increase and investing in an eco-friendly and effective RO system, such as the Waterdrop G2P600.

The Bottom Line

I’ve reviewed different types of filters in my quest to find the right water quality for the best coffee brew. And so far, Waterdrop’s G2P600 reverse osmosis filter system has consistently outperformed others. Especially its remineralization feature, which enhances the taste of coffee like none other. 

Waterdrop’s RO systems are most efficient at stripping harmful contaminants from tap water, providing long-lasting solutions for drinking, cooking, and, of course, brewing needs. It can filter 600 gallons per day at a 0.42-gallon-per-minute flow rate, which is pretty impressive. 

This under-sink tankless system easily fits in tight spaces. Unlike conventional RO systems, it requires power to run, but in return, you’ll have higher flow rates and less wastewater. The product is NSF-certified and requires minimum maintenance annually. Its compact design makes installation and replacing old filters a piece of cake. 

The Clearly Filtered pitcher and Waterdrop’s faucet-type filter also offer clean, portable, and inexpensive water. However, G2P600’s remarkable filtration system is the best long-term solution for coffee lovers. Order from Waterdrop today

Research Methodology 

Want to know how I ranked the best water filters? Spoiler alert: It’s not just about filtration. But coffee brewed to perfection requires more than just quality beans; the water you use plays an equally crucial role. Here’s the step-by-step process I used to sort the best water filter for coffee out there. 

Step 1: A big list of water filters for coffee

My initial move was to round up a bunch of the trendiest tap water filters currently making waves in the market. I scoured through places like Amazon, Walmart, and Target to see what filters were creating a buzz in the market. I also visited local coffee shops to inquire about the type of water they use. 

By the end of the day, I had a list of 12 water filters, including filter pitchers, countertop filters, ultraviolet water purifiers, whole-house filters, and under-sink filters. 

Practically everyone loves coffee, so I reached out to friends and family to get their recommendations as well. Because you never know who’s got the inside scoop, right?

Step 2: Product Analysis

I wanted to know what makes a filter truly stand out for brewing that perfect cup of joe. I scoured the web for answers to burning questions like, “What’s the secret sauce in the best water filters for coffee?” 

And you know me, I didn’t stop there. I swung by my favorite local coffee joint, had a quick chat with the barista, and got the lowdown on what type of water they use to brew coffee, starting with filtration.

Here’s the scoop: I learned that everyday tap water could be a real buzzkill for your coffee’s flavor. Nasty stuff like chlorine, organic compounds, dirt, and even heavy metals can leave your brew tasting bland. 

However, natural minerals in water can actually enhance the coffee’s flavor profile. An example of this is Third Wave Water sachets that add necessary minerals in your coffee

However, the best way is to filter tap water through activated carbon, sediment filters, or reverse osmosis filters. And make sure your water contains a small amount of healthy minerals. So, I brainstormed the following points to review the filters:

  • Targeted contaminants
  • Presence of essential minerals
  • Water quality
  • Filter life 
  • Flow rate
  • NSF/ANSI or WQA certification
  • Ease of installation
  • Costs
  • Warranty 

Step 3: Online reviews

Next, I immersed myself in a sea of online reviews and verified testimonials from users who had put these water filters to the test. I also tuned into reviews by enthusiastic barista-cum-bloggers, extracting valuable insights into each filter’s strengths and weaknesses. 

I found out some brands were riding the wave of fake and bogus reviews, so I removed them from my list.

Step 4: Interviews with real customers

In the next phase of my research, I reached out to customers who were actually using these filters, including a bunch of family members. Some even made me a cup of coffee so I could taste it myself. 

Hearing about their real-life experiences was a game-changer. It was like insider info straight from the source. 

Step 5: Interviews with companies

Next, I decided to hit up the customer service of the brands on my radar. I sent them a bunch of questions about certifications. I even forwarded some customer complaints just to see how they’d handle it. Turns out, some brands totally aced it, while others ignored my calls. I included this insight in my final ranking. 

Step 6: Test drives

Finally, I tested the water filters by myself. I set up a test rig in my garage and used regular city water as a source, collecting water samples after specified intervals. I measured flow rates, filtration time, water quality, and TDS levels, then brewed coffee with collected samples and did a taste test. 

Some samples resulted in really bad-tasting coffee, so I removed those filters from my list. I continued this test for three days. 

Next, I ran water filters for half of their lifespan just to see how they held after prolonged use, to which I dedicated an additional week. This helped me determine which filters work well in terms of taste, practicality, and quality. 

Step 7: Ratings

Once I had the test results, I organized everything in the spreadsheet and scored each filter on their performance. I started with 12 water filters, but in the end, only eight made the final cut. I gave the points based on the following criteria: 

  • My own test results
  • Online reviews 
  • Filter lifespan
  • Ease of installation 
  • Maintenance 
  • Certification 
  • Warranty 
  • Overall cost
  • Build quality 

Best Water Filter for Coffee Brewing

The testing process was rigorous, keeping me up at night — quite literally due to the abundance of coffee tasting. I may have developed an arrhythmia, but it was totally worthwhile, leading me to experience some of the finest coffee flavors I’ve enjoyed in a long while.

The Waterdrop G2P600 scored highest on my list when it comes to performance. Here are the things that made this reverse osmosis system stand out: 

  • Excellent filtration 
  • Remineralization feature
  • Long-term solution
  • Minimal maintenance
  • High flow rate
  • Longer lifespan
  • Safe water for coffee machines
  • Certified product
  • Extended warranty 
  • No need for bottled water

If you’re not willing to miss out on high-quality water for a delicious coffee experience, then Waterdrop’s G2P600 is my top recommendation. Don’t wait — get yours today.

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