The Best Under-Sink Water Filter for Well Water: Purify Your H2O With Confidence (2024)

Updated on:
February 27, 2024

While well water can be a reliable and refreshing source of drinking water, it’s crucial to ensure its purity and safety for your family’s health. That’s where under-sink water filters come in, offering convenient and efficient filtration right at your kitchen sink.

In this article, I’ll dive into the world of well water filtration and present you with the seven best under sink water filters for well water, meticulously selected to tackle the unique challenges posed by well water contaminants.

Say good-bye to worries about contaminants and unpleasant tastes, and get ready to enjoy the refreshing goodness of pure well water with the help of these top-notch under-sink water filters.

Best Under Sink Water Filter for Well Water: SpringWell SWRO: 9.3/10

  • Best under-sink filter for well water
  • Price: $457.84

The SpringWell Reverse Osmosis System uses a four-stage filtration process to effectively filter out TDS (total dissolved solids), VOCs (volatile organic compounds), microorganisms, insecticides, and pesticides. It has also proven effective against heavy metals, sulfides, and chloramines. 


  • High filtration capacity (75 GPD)
  • Made with NSF-certified components
  • Easy DIY installation
  • Hassle-free maintenance and servicing
  • Removes thousands of harmful contaminants
  • Made in the USA
  • Available upgrade options
  • Lifetime warranty


  • No remineralization filter
  • UV filter upgrade is expensive


The SpringWell’s four stages include a sediment pre-filter, a carbon-block pre-filter, an RO membrane, and a carbon-block post-filter.

The sediment pre-filter removes large particles and sediment. Next, the carbon-block pre-filter reduces chlorine, VOCs, heavy metals, and bad tastes and odors. Then the reverse osmosis membrane removes dissolved solids, bacteria, viruses, and other contaminants. Finally, the carbon-block post filter further enhances taste, odor, and overall water quality. 

Installation is super easy. It took me an hour and a half to set up my test system. If you’re not a DIY person, you can always hire a professional plumber to do the job. Since it’s an under-sink filter system, professional installation should not cost much. 

Maintenance is also easy. The innovative twist and lock filter design allows for quick filter replacements — no tools required. Furthermore, since the unit has an integrated filter-cartridge design, it doesn’t collect germs and bacteria like other reverse osmosis systems that use exterior filter housings.

The SpringWell RO system has a high-capacity filtration rate of 75 GPD (gallons per day), which is enough to meet the daily needs of a large family. In contrast, most RO systems only provide around 40–50 GPD. The 3.2-gallon tank stores purified drinking water that you can access even when the power goes out. SpringWell also throws in a stainless steel dispenser faucet.

However, this water filter has a few limitations. 

The filters need frequent replacements as soon as six months, which is common for filters with this level of filtration, but still, it’s worth noting. Also, this SpringWell model doesn’t add minerals back into the filtered water. Furthermore, the UV filter upgrade costs $1,100. That’s not a big deal, though, because reverse osmosis already cleans water pretty efficiently.

SpringWell provides a lifetime warranty on the tank and valves and a six-month money-back guarantee. However, if the reviews are any indication, you’re unlikely to need it. This unit is sturdy, easy to install, low maintenance, and effective.

If you’re looking for an affordable and effective under-sink filtration system for your well water, get the SpringWell four-stage reverse osmosis system here.

2. Home Master HydroPerfection Reverse Osmosis System: 8.9/10

  • Best for pathogen removal
  • Price: $529.95

The Home Master TMHP HydroPerfection reverse osmosis system uses a nine-stage filtration process to effectively remove 99% of chlorine and chloramines, chemicals, lead, heavy metals, fluoride, microplastics, TDS (total dissolved solids), and thousands more.


  • High daily production rate (75 gallons)
  • Efficient water usage
  • Made with NSF-certified materials
  • Integrated UV sterilizer for pathogen removal
  • Approved by the EPA (Environmental Protection Agency)
  • Easy upgrades and service
  • Retains important minerals


  • Complex installation
  • Expensive
  • Limited warranty


The RO membrane in the TMHP HydroPerfection system has a fine pore size, typically around 0.0001 microns, which allows it to remove a wide range of contaminants commonly found in well water. With its nine-stage filtration process, this under-sink filter system ensures you have crystal clear mineral water straight from the kitchen faucet. 

The Home Master filter has a nonelectric permeate pump that increases the system’s efficiency with its HydroPerfection technology. It decreases water waste by up to 80% while increasing water output by up to 50%, for a waste-to-pure water ratio of roughly 1:1. It also produces significantly cleaner water by eliminating TDS Creep, a serious concern for some RO systems.

For your peace of mind, this system is manufactured with NSF-certified components. The EPA has even recognized and approved the UV filter technology for its efficiency in neutralizing microbial, disease-causing pathogens.

Maintenance is also quite easy. The modular design allows for easy upgrades and servicing. You don’t need a wrench to change the filters!

However, it’s important to note a few drawbacks. 

At almost $530, the TMHP HydroPerfection system is quite expensive. It also requires some plumbing knowledge and skills to install. 

I’ve read numerous customer complaints about leaks, a short cold water line, and unclear installation instructions. Which is troubling considering the unit is only covered by a five-year limited warranty and a 30-day money-back guarantee — not quite as good as SpringWell’s.

If you’re looking for a comprehensive and reliable multistage under-sink water filter for your well water, check out the Home Master TMHP HydroPerfection reverse osmosis system.

3. Waterdrop Remineralization RO System with UV sterilizer: 8.5/10

  • Best for remineralization
  • Price: $1,018.99

The Waterdrop G3P800 is a multistage under-sink water filter that uses a highly advanced seven-layer RO membrane to effectively filter out over 1,000 contaminants from well water, including PFAS, fluoride, heavy metals, and salts.


  • Third-party certified against NSF/ANSI Standard 58 for TDS reduction and NSF 372 certified for lead-free material
  • Faucet has an LCD TDS indicator
  • Saves 12 times more water than traditional RO systems
  • 800 GPD ultra capacity
  • Smart mercury-free LED UV sterilizer
  • Adds 18 different natural minerals and trace elements to filtered water
  • Stylish tankless design
  • Easy installation


  • Very expensive
  • Short warranty period
  • Not very effective against chloramine


One notable feature of the Waterdrop G3P800 system is its high production capacity, capable of producing up to 800 gallons of purified water per day (GPD). This makes it suitable for larger households or situations where a significant amount of purified water is required. 

This under-sink water filter has several third-party certifications to validate its performance and quality, including NSF certification, as well as the Water Quality Association (WQA) Platinum Seal. It’s also made with FDA-compliant materials. Its stylish tankless design has even won it an international design award.

Another important feature is the remineralization filter. The G3P800 under-sink water filtration system system typically contains a blend of natural mineral stones or media. As the purified water flows through this filter, it comes into contact with these mineral stones, allowing the minerals to dissolve and infuse into the water, enhancing the water’s mineral content. 

The remineralization filter effectively adds 18 different minerals to the filtered water, including calcium, magnesium, potassium, strontium, and other beneficial minerals. These minerals improve the water’s improved taste as well as providing potential health benefits, such as proper hydration, bone health, and electrolyte balance.

This system also has an innovative LED UV chip that filters 99.9% of the microbes and viruses in your well water — handy if you’re not convinced RO can do it alone

Despite the manufacturer’s claim that this system saves 12 times more water than a traditional RO system (just one cup of wastewater for every three cups of filtered water produced, allegedly), I realized during testing that the ratio is more like 1:1. 

I also kept getting the error code “E03,” which indicated that the system was overworked and could not filter water. After continuous use, raw well water would clog the G3P800’s membrane with iron, hardness minerals, and harmful pathogens. I suggest you invest in a pre-treatment option before installing this system. 

And for more than $1,000, I would expect an extensive warranty period, but you’ll only get a one-year manufacturer’s warranty and a 30-day return guarantee. 

If you need a compact, highly effective under-sink water filter system and you aren’t afraid to dig deep into your pockets, the Waterdrop G3P800 under-sink filtration system has some fancy features.

4. APEC Water Systems Essence Series

The APEC Essence under-sink water filter system features a high-quality TFC (Thin Film Composite) reverse osmosis (RO) membrane that removes up to 99% of total dissolved solids (TDS), heavy metals, bacteria, viruses, and other impurities. 

The system also includes a UV sterilization stage that effectively eliminates bacteria, viruses, and microorganisms, providing an additional layer of protection. Furthermore, an alkaline remineralization filter adds back beneficial minerals, improving the water’s taste and pH balance.

Unfortunately, the system’s build quality is a reflection of its low cost. There have been complaints about leaks from concerned users. Others have lamented that the remineralization filter often sheds calcium, which produces cloudy water, and the UV sterilizer is always on, which results in increased energy consumption and produces warm water. 

APEC can sell you a $55 flow-detection system upgrade that shuts down the UV filter when not in use. The one-year warranty period is also too short compared to the SpringWell.

Despite these shortcomings, the Essence under-sink water filter system has glowing reviews and has managed to score 4.5 out of 5 stars in 794 global ratings. Apart from the UV filter constantly warming the water, I did not encounter many issues during my test run.

If you need an under-sink water filter system that is affordable, easy to maintain, and removes 99% of dissolved solids from your well water, check out the APEC Essence series reverse osmosis system today.

5. Pentair FreshPoint Triple-Stage Carbon Block System

The Pentair FreshPoint drinking water filtration system is a compact and efficient under-sink filtration system designed to provide clean and great-tasting water for homeowners with well water. This system features a three-stage filtration process that effectively removes sediment, chlorine, taste, odor, and certain contaminants commonly found in well water.

The FreshPoint system is known for its ease of installation, compact design, and cost-effectiveness. It comes with an installation kit and detailed instructions for a hassle-free setup.

However, the FreshPoint system has its limitations. Despite being branded a “well water filtration system,” its filtration capabilities are quite limited. For instance, I observed that while it is good at removing excess sediments and other volatile compounds, it doesn’t remove iron and other heavy metals very well — which you need in a well water system especially. 

The FreshPoint system is primarily designed to address sediment, chlorine, taste, odor, and some other common contaminants found in well water. If you require a more effective filtration solution for your well water, consider the SpringWell reverse osmosis system instead.

6. Aquasana Claryum 3-Stage Max Flow System

The Claryum 3-Stage Max Flow under-sink water filter system utilizes a three-stage filtration process to effectively reduce contaminants commonly found in well water. 

The stages typically include a sediment pre-filter, an activated-carbon filter, and a catalytic carbon filter. This combination removes sediment, chlorine, heavy metals, organic chemicals, and other impurities, improving the overall taste and quality of your well water.

The Max Flow design of this Aquasana system allows for a high flow rate of up to 0.72 gallons per minute. This means you’ll have a robust and continuous supply of filtered water, even at peak demand times. 

The system is NSF certified to standards 42, 53, and 401. These certifications validate its effectiveness in reducing chlorine, lead, mercury, herbicides, pesticides, pharmaceuticals, and other contaminants commonly found in well water.

The system is designed for easy installation under the sink, and it comes with all the necessary parts and clear instructions. This makes maintenance hassle-free and convenient for homeowners.

However, replacement filters for the Claryum 3-Stage Max Flow system can be relatively expensive compared to standard carbon filters. Also, if your well water has a higher TDS level, you might need a pre-filter option because this system is not effective at reducing TDS levels. 

Also, there have been numerous customer complaints about leaking filters, and Aquasana has not been forthcoming about replacing the units, even when the product is within the one-year warranty period. To avoid these issues, you’re better off purchasing the SpringWell reverse osmosis system

7. Culligan US EZ-4 Under Sink Water Filter System

If your well water is affected by runoff from agricultural, construction, or mining activities, the Culligan EZ-4 is the best under-sink filtration system for you. 

Besides the usual sediment, chlorine, and hydrogen sulfide commonly found in well water, the Culligan under-sink filter can reduce turbidity, remove mercury, lead, lindane, cysts such as giardia and cryptosporidium, and perfluorinated chemicals that seep into groundwater due to the activities mentioned above.

The system features a single-cartridge design that can fit even in the smallest of spaces. The installation kit also includes a chrome, lead-free faucet with all the necessary fittings. At only $93.11, it’s one of the cheapest under-sink well water filters on the market.

However, while the single-cartridge design simplifies filter changes, it may limit the system’s ability to target a broad range of contaminants or provide comprehensive filtration. 

Depending on your water consumption and quality, frequent filter changes may be necessary, adding to the ongoing maintenance cost. The free faucet is not very durable, the water pressure isn’t high enough, and a couple of users have complained about leaks. 

If you need a more comprehensive under-sink filtration system, the SpringWell RO system is the best under-sink water filter for your well water.

Bottom Line 

After a rigorous review process, I have concluded that the SpringWell reverse osmosis system is the best under-sink water filter for well water. 

With its four-stage filtration process, this system effectively removes a wide range of contaminants commonly found in well water, including sediment, chemicals, heavy metals, and microorganisms. 

It has a high filtration rate of 75 GPD and includes a 3.2-gallon storage tank that provides access to purified drinking water at any time of the day. Installation is quite easy, and so is the filter-replacement procedure. 

If you need a comprehensive, reliable, and hassle-free under-sink water filter system covered by a lifetime warranty, check out the SpringWell reverse osmosis system today.

Best Under-Sink Water Filter for Well Water: Review Methodology

This section discusses the process I went through when reviewing these under-sink water filters for well water.

Step 1: A big list of all available products

Since I was starting with a clean slate, I needed to know “who’s who” in the water filtration industry. This meant compiling a long list of notable brands invested in well water filtration. 

I spent hours on the internet scouring websites like Amazon, Lowes, Home Depot, and Costco for the best-selling brands of under-sink well water filters. I also talked to a few water treatment dealers just to increase the scope of my research. In the end, I had a list of 30 different models.

Step 2: Online Reviews

Step 2 was to examine customer reviews for the most popular under-sink well water filter brands in the US. 

It goes without saying that if you want to know how a product is performing in the market, you need to study consumer sentiment. So I spent hours going through websites such as Consumer Affairs, Amazon, Good Housekeeping, Angi, and manufacturer websites, among others. Finally, I was able to reduce the list to 15 reliable models.

Step 3: Product/service analysis

For the next step, I needed to ask myself important questions about the products I was reviewing so that I could have a deeper understanding of the features to look out for. These questions include the following:

  • What is the average filter capacity for under-sink filter systems? 
  • How easy is the installation and maintenance process for under-sink filters? 
  • What is the difference between granular-activated carbon media and a reverse osmosis filter with regards to well water filtration?
  • What is the average filter life for under-sink filters? 
  • How does sediment filter media affect water supply or water pressure?
  • What is the difference between a sediment and carbon filter? 
  • Does a reverse osmosis system retain healthy minerals after the filtration process?

Any under-sink water filter that did not meet at least 80% of the requirements on my stringent checklist was booted from the list.

Step 3: Speaking with real customers

With a list of reputable under-sink water filters in hand, it was time to contact consumers who had made a purchase and ask them about their experiences. 

So, with the assistance of my partner and a few pals, we planned a 10-mile radius questionnaire survey. I also spoke with numerous water treatment dealers to get expert advice. It was an expensive and difficult undertaking, but it paid off in the end.

Step 4: Speaking with customer support departments

The next step involved calling the customer service representatives of the remaining under-sink well water filter manufacturers and pressuring them to reply to some of the unfavorable feedback from customers they had received. This enabled me to see how each company handled negative criticism and how conscientious its customer service employees were.

Step 6: Test drives

Now that I had a list of the top seven under-sink water filters for well water, I decided to rate them on the quality of water they produced. 

I approached a few water treatment dealers and asked if they would be able to supply several units for testing. Despite a few negative answers, one dealer agreed to supply all seven systems on the condition that its technicians be present throughout the testing.

So I hired two massive water bowsers full of well water, rented a warehouse for a week, and began the weeks-long testing process.

Step 7: Ratings

For the final step, I needed to create a rating list based on the following characteristics:

  • Contaminant removal efficiency 
  • Certification and testing 
  • Affordability
  • Filter capacity and flow rate
  • Installation and maintenance
  • Safety and convenience features 
  • After-sales service and support 
  • Warranty period
  • Filter life

The Best Under-Sink Well Water Filter System: Conclusion

When it comes to under-sink well water filtration, the SpringWell reverse osmosis system emerges as the clear winner. With its four-stage filtration process, it effectively removes a wide range of harmful contaminants, including heavy metals, insecticides, herbicides, TDS, VOCs, and microorganisms present in well water, ensuring clean and safe drinking water. 

This system is made of third-party certified materials guaranteed to last for years. That plus its lifetime warranty and six-month money-back guarantee means this may be the last water filter system you ever have to buy

Choose the SpringWell reverse osmosis system and enjoy the convenience of clean, great-tasting water right from your tap.

If you’re looking to discover different types of filters for your well water, we’ve got you covered! Check out these reviews of the best well water filters:

Notify of

Inline Feedbacks
View all comments