6 Best Under-Sink Water Filters Of 2024 To Keep Your Water Clean

Cloud's compact system easily fits under most sinks—but it still removes 99% of contaminants. It connects directly to your water line and uses reverse osmosis to remove contaminants like lead, fluoride, PFAs, pesticides, and pharmaceuticals.

Once water is properly filtered, it goes through a remineralization stage, where the system adds back trace minerals like calcium, magnesium, and potassium. This puts your water at an alkaline pH level of 9.0. 

We love that the filtered water sits in a 2.8-gallon holding tank ready to use, which increases the speed of the water flow. Plus, the system is battery-operated and connects directly to a smart app, so you can keep an eye on water quality (and your own water intake). 

What reviewers say: "We have tried several different water filtration systems in the past and this one is by far our favorite," says one tester. "Even our pickiest family members agree, the water tastes amazing!! The installation process was smooth and easy, the unit is sleek and silent, and I love how the app is tracking our personal usage so we know exactly when new filters are needed! Can’t recommend this product enough!"

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Under sink water filters don’t have to be large and bulky. If you want to invest in an under sink water filtration system but are low on space, this one's for you.

This pint-sized version, which is only 9 inches high and a little over 8 inches wide, can easily be installed under your sink without taking up much room. Plus, it comes with a dedicated metal faucet that's available in 3 different finishes.

Each system has an NSF/ANSI-approved Claryum dual-stage filter, which combines activated carbon, catalytic carbon, and ion exchange filtration. It removes up to 99% of contaminants found in tap water while leaving in healthy minerals like potassium and magnesium.

If you want a low-maintenance system, look no further—each filter lasts about six months, on average, translating to approximately 500 gallons before it has to be replaced. Replacement can also be done in a cinch—just snap off the old filter and lock in the new one. 

What reviewers say: One happy customer writes, “So compact and tastes so good. I had no trouble installing it myself, just had to get a drill bit for the faucet to be installed in my sink. Highly recommend.” Many people approve of this under sink water filter, but one did mention that they wish the filters lasted longer.

If you have well water that tastes or smells bad, consider picking up this system. Easy to install and use, this WQA-certified option does a great job of transforming unpalatable well water into a quality you actually want to use. It helps reduce 99% of contaminants (including chlorine, fluoride, and lead), improves taste and odor, and even comes with a designer faucet. 

Made by one of America’s top-rated water filter brands, this APEC system boasts high-quality leak-free connect fittings that require zero sealing (no running to the hardware store during installation) and everything you need to put it together yourself.

Even better? The system is noise-free, so you don’t have to worry about loud rumbling during all hours of the day. You will, however, need to keep tabs on a few different filters for varying replacement times—the pre-filter needs to be changed every 6-12 months, while the membrane and carbon filters last 2-3 years.

What reviewers say: With over 9,000 five-star ratings on Amazon, this popular under-sink water filter is especially praised for its straightforward installation and exceptional design. “The taste of our well water was transformed after installing this,” one Amazon shopper writes. “We save hundreds of dollars a year because we no longer buy bottled water. The taste is better than any bottled water out there. I’ve had 3 people so impressed with this system that they purchased their own.” A couple of people do point out that, depending on your sink setup and plumbing, you may need additional tools for installation.

This high-quality under-sink water filter takes water filtration to a whole new level. Water goes through not one, not two, but three layers of filtration that help reduce levels of chlorine, odor, and other contaminants.

Every system comes with a stainless steel faucet, a water inlet hose and a water outlet hose—basically everything you need to put it together yourself (which reviewers say only takes a few seconds to do). 

Even better? The filters have smart indicators that alert you when any of the three filters need to be switched out. Each filter lasts between six and 24 months, and the replacement process isn’t too tricky.

It’s important to note that the carbon blocks used in this device’s filters are made from natural coconut shells, which may be detrimental for those allergic to coconut. Also, installation requires you to drill a hole in your countertop, so make sure yours can withstand this step.

What reviewers say: “I rarely write reviews but this warranted it six months later!” one elated reviewer writes. “The water tastes great and it is so easy to replace the filters. I needed a system that needed to sit at the bottom of the kitchen cabinet and it’s perfect. I couldn’t say enough about it. They make it easy to order filters, have a QR code right on the box, everything about it is user-friendly and the quality is superb.”

A great choice for those who prefer a reverse osmosis under-sink filter, this NSF-certified, heavy-duty option boasts thousands of 5-star ratings and features a 6-stage alkaline remineralization layered filtration.

In other words, not only does this filter remove up to 99% of contaminants (like chlorine, lead, and calcium), but it also restores water’s natural alkalinity levels and mineral content. This is what helps give its filtered water such a great taste.

Constructed to fit perfectly under kitchen sinks, this system has been specifically designed for DIY installation. Each kit comes with an instruction manual, instruction videos, and easy access to technical support. 

What reviewers say: Shoppers love this under-sink water filter for its quick and easy installation and helpful customer service that’s available if you run into any issues. A few customers mention that this model is slightly bulk and takes up considerable room. Be sure to measure the space under your sink before adding this one to your cart.

This wallet-friendly under sink water filter is an excellent option for those looking to upgrade their tap water for a lower investment. Each system is made from BPA- and lead-free materials that are either WQA- or NSF/ANSI-approved. It does a great job at reducing impurities, like lead, chlorine, and heavy metals, often found in tap water, and its filter has a 12-month maximum service life. This equates to approximately 8,000 gallons. 

What’s more, this particular under sink filtration system features a “push-to-connect” design. This means it can be installed in just a few minutes, which is great news if you’d like to put it together yourself. Every kit includes a design-forward stainless steel brush faucet with a fast and stable flow rate, so you won’t have to wait forever for your water to come out. 

What reviewers say: This pick is strongly recommended by nearly 2,000 Amazon reviewers who gave this system a perfect five-star rating. One writes, “I had my handyman install it for me. It took him about a half hour. Anyway, it looks great, and the water tastes good. Also very affordable.” A few people do mention that they wish the directions were clearer. Others share that installation customization (such as using more washers) may be necessary in some cases.