6 Best Water Filters to Remove Arsenic in 2026

Short answer: the best water filter for arsenic is one that is specifically rated or certified for arsenic reduction, matches your water test results, and has a realistic filter replacement cost. Reverse osmosis systems are often the strongest choice for drinking-water arsenic reduction, while some gravity, under-sink, and multi-stage filters can also help when their test data supports arsenic removal claims.

Before buying, test your water for arsenic level and type where possible. Arsenic can appear as arsenic III or arsenic V, and filters do not all perform equally against both forms. For deeper background, see our guide on whether reverse osmosis removes arsenic from water.

Quick picks for arsenic removal

• Best RO-style option in this list: APEC ROES-50, because reverse osmosis is commonly used for drinking-water arsenic reduction when the system is maintained correctly.
• Best premium under-sink RO option: Home Master TMAFC-ERP, because it combines RO filtration with remineralization and a strong home-drinking-water setup.
• Best budget-friendly RO option: iSpring RCC7AK, because it is a popular under-sink RO system with remineralization at a lower price point.
• Best non-RO comparison: Big Berkey may fit countertop/gravity-filter needs, but confirm current arsenic test data and replacement-filter requirements before relying on it.

If your main concern is arsenic in drinking water, compare each product’s documented arsenic-reduction claims, certification details, flow rate, filter life, and replacement cost. You can also compare broader RO options in our best reverse osmosis systems for home use guide and our reverse osmosis drinking water system guide.

Are you searching for a water filter that can reduce arsenic in your drinking water? In this article, we’ll compare the listed reverse osmosis, under-sink, and gravity-fed options through the lens that matters most for arsenic: documented reduction claims, relevant certification or test data, flow rate, filter life, and replacement cost. No filter should be treated as a blind guarantee, so confirm your water test results and verify the current product data before buying.

1. APEC ROES-50

One of the standout features of the APEC ROES-50 is its reverse osmosis filtration system. For an arsenic-focused drinking-water setup, this makes it one of the stronger options in the list, provided the current model documentation supports the arsenic-reduction claim you need and the system is maintained on schedule.

With a filtration capacity of 50 gallons per day, the ROES-50 provides an ample supply of clean, great-tasting water for our household. The system operates quietly and efficiently, delivering a steady flow of purified water. I particularly appreciate its large 4-gallon tank capacity, which means I don’t have to worry about running out of filtered water, even during peak usage times.

The ROES-50 has a 5-stage filtration process. The sediment and carbon block filters handle larger particles and chlorine taste or odor, while the reverse osmosis membrane is the key stage to verify for arsenic reduction. The final carbon block filter further improves taste before the water reaches the faucet.

What I like about the APEC ROES-50 is that it is presented as an NSF/ANSI Standard 58 RO system. Before buying for arsenic specifically, confirm whether the current certification or performance sheet includes the arsenic claim you need, because not every NSF/ANSI 58 listing covers every optional contaminant.

As for the pros and cons, here’s a quick summary:

Pros:

• RO filtration approach is a strong fit for arsenic-focused drinking-water treatment when current product data supports the claim.
• Reverse osmosis technology for thorough purification.
• Ample filtration capacity and large tank size.
• NSF/ANSI Standard 58 certified.
• Quiet and efficient operation.
• Comes with a 1-year limited warranty and lifelong support.

Cons:

• Requires professional installation for optimal performance.
• Filter replacement can be a bit costly.

2. Home Master TMAFC-ERP

The Home Master TMAFC-ERP features a 7-stage under-sink filtration system. It is the premium-style option in this list because it pairs RO filtration with remineralization and higher daily production, but arsenic buyers should still verify the current model’s arsenic-reduction documentation before relying on it.

One of the standout features of the Home Master TMAFC-ERP is its impressive filtration capacity. With a rate of 75 gallons per day, it can easily meet the daily water needs of my household. The system efficiently filters water, providing a continuous supply of purified water for drinking, cooking, and other household uses. The 3.2-gallon tank capacity ensures that I always have access to filtered water, even during peak usage periods.

The 7-stage filtration process includes sediment, iron, catalytic carbon, RO membrane, remineralization, and polishing stages. For this article’s purpose, the RO membrane and the current contaminant-reduction documentation matter most; the remineralization stages are mainly a taste and water-profile benefit.

One notable fact about the Home Master TMAFC-ERP is its NSF/ANSI Standard 58 positioning. For arsenic, check the current certification details or performance sheet for the exact claim, then confirm results with post-installation water testing if your source water has confirmed arsenic.

Now, let’s take a look at the pros and cons:

Pros:

• Premium RO setup with features that can suit arsenic-focused drinking-water treatment when verified by current model data.
• Comprehensive 7-stage filtration process.
• Ample filtration capacity and tank size.
• NSF/ANSI Standard 58 certified.
• Easy installation under the sink.
• Comes with a 5-year limited warranty and lifelong support.

Cons:

• Requires under-sink installation, which may not be suitable for everyone.
• The system can be a bit bulky under the sink.

3. iSpring RCC7AK

The iSpring RCC7AK features a 6-stage alkaline reverse osmosis filtration system, combining RO filtration with an alkaline remineralization filter. It is a sensible budget-friendly RO pick in this list, especially if you want remineralization, but the arsenic claim should still be checked against current product documentation.

With a filtration capacity of 75 gallons per day, the RCC7AK is more than capable of meeting the daily water needs of my household. The system efficiently filters water, providing a steady supply of purified water for drinking, cooking, and other everyday uses. The 3.2-gallon tank capacity ensures that I always have access to filtered water, even during high-demand periods.

The 6-stage process includes sediment and carbon filters, an RO membrane, and an alkaline remineralization stage. For arsenic, focus less on the alkaline stage and more on whether the current membrane/system documentation supports the reduction claim for your test result.

One notable feature of the iSpring RCC7AK is its NSF/ANSI Standard 58 positioning. Because arsenic reduction is a specific performance claim, confirm the current certification details or performance sheet rather than assuming every RO certification covers your contaminant.

Now, let’s take a look at the pros and cons:

Pros:

• Budget-friendly RO format that can be appropriate for arsenic concerns when the current claim is verified.
• Alkaline remineralization for improved taste and mineral profile.
• Ample filtration capacity and tank size.
• NSF/ANSI Standard 58 certified.
• Easy to install and maintain.
• Comes with a 1-year limited warranty and lifelong support.

Cons:

• The initial installation process may require some plumbing knowledge.
• Filter replacement can be a bit time-consuming.

4. Aquasana 3-Stage

The Aquasana 3-Stage is the main non-RO under-sink comparison in this list. It can be attractive if you want simpler filtration and strong taste/odor improvement, but for confirmed arsenic contamination you should verify the current model’s arsenic-specific claim before choosing it over an RO system.

One of the standout features of the Aquasana 3-Stage is its impressive filtration capacity. Each filter replacement is capable of purifying up to 600 gallons of water, making it highly cost-effective and convenient. I appreciate not having to replace the filters frequently, which translates to fewer maintenance tasks and reduced expenses over time.

The 3-stage filtration process starts with a pre-filter for sediment and larger particles, followed by activated carbon for chlorine taste and odor. The Claryum selective filtration stage is the part to check for current contaminant-reduction claims, including whether arsenic is covered for the exact model.

One notable fact about the Aquasana 3-Stage is its NSF/ANSI 42, 53, and 401 positioning. For this arsenic-focused article, the key question is whether the current certification listing or performance sheet includes arsenic reduction for the exact model being sold.

Now, let’s look at the pros and cons:

Pros:

• Useful non-RO comparison if current product data supports the arsenic claim you need.
• Long filter life with a capacity of 600 gallons per replacement.
• Comprehensive 3-stage filtration process.
• NSF/ANSI Standards 42, 53, and 401 certified.
• Easy installation under the sink.
• Comes with a 1-year limited warranty and lifelong support.

Cons:

• Requires under-sink installation, which may not be suitable for everyone.
• May not be suitable for areas with extremely high levels of arsenic.

5. Big Berkey BK4X2

The Big Berkey BK4X2 features a gravity-fed filtration system, which eliminates the need for electricity or complex installations. This makes it a versatile and convenient option for providing purified water in various settings, whether at home, during outdoor activities, or in emergency situations.

One of the standout features of the Big Berkey BK4X2 is its impressive filtration capacity. With a rate of 2.25 gallons per hour, it can efficiently produce a steady supply of purified water. The system’s storage capacity of 2.25 gallons ensures that I always have access to filtered water, even during periods of high demand.

The filtration process of the BK4X2 uses a gravity-fed design with replaceable filter elements. That makes it convenient for countertop use and emergency-style setups, but arsenic buyers should verify current test data for the exact filter elements before treating it as the primary solution for confirmed contamination.

One notable fact about the Big Berkey BK4X2 is its durable construction. The system is made of high-quality stainless steel, which not only gives it a sleek and modern look but also ensures its longevity. The stainless steel material is resistant to rust and corrosion, providing added durability and reliability.

Now, let’s take a look at the pros and cons:

Pros:

• Countertop gravity-fed format may fit some buyers, but arsenic-specific reliance should depend on current filter-element data.
• Gravity-fed system for versatile use.
• Impressive filtration and storage capacity.
• Durable stainless steel construction.
• Easy to assemble and use.
• 6-month warranty on filters.

Cons:

• Requires manual filling and monitoring of water levels.
• Filter lifespan may vary depending on water quality.

6. Express Water RO5DX

The Express Water RO5DX uses a 5-stage reverse osmosis filtration system. It is another practical RO option in this list, especially for buyers who want a standard under-sink setup, but the current arsenic-reduction documentation should be checked before buying for a known arsenic problem.

One of the standout features of the Express Water RO5DX is its impressive filtration capacity. With a rate of 50 gallons per day, it can easily meet the daily water needs of my household. The system operates efficiently, delivering a steady flow of purified water for drinking, cooking, and other household uses. The 4-gallon tank capacity ensures that I always have access to filtered water, even during high-demand periods.

The 5-stage filtration process includes sediment and activated carbon filters, an RO membrane, and post-filtration carbon stages. For arsenic, the RO membrane and the system’s current contaminant-reduction claim are the parts to verify; the carbon stages mostly support sediment, chlorine taste, odor, and final polishing.

One notable fact about the Express Water RO5DX is its NSF/ANSI 42, 58, and 61 positioning. Since NSF/ANSI 58 has optional contaminant claims, confirm whether the current listing or performance sheet includes arsenic reduction for the system configuration you are buying.

Now, let’s take a look at the pros and cons:

Pros:

• Standard RO format that can fit arsenic-focused use when the current system data supports the claim.
• Comprehensive 5-stage filtration process.
• Ample filtration capacity and tank size.
• NSF/ANSI Standards 42, 58, and 61 certified.
• Easy installation and operation.
• Comes with a 1-year limited warranty and lifelong support.

Cons:

• Requires some under-sink space for installation.
• Filter replacement can be a bit costly over time.

Buying Guide: Choosing the Best Water Filter to Remove Arsenic

Ensuring the purity of our drinking water is essential for our health and well-being. When it comes to removing arsenic, a highly toxic contaminant, a reliable water filter is crucial. With a plethora of options available on the market, choosing the right water filter to remove arsenic can be overwhelming. Fear not! As an expert in water filtration, I’m here to guide you through the process. Below, you’ll find a detailed buying guide that will help you make an informed decision and select the best water filter for your needs.

• Know Your Water Quality: Before diving into the world of water filters, it’s essential to understand the quality of your water. Get your water tested to determine the presence and concentration of arsenic. This will help you assess the severity of the contamination and choose an appropriate filter with the necessary filtration capabilities.
• Consider Filtration Efficiency: Look for water filters that specifically mention arsenic reduction in their specifications, certification listing, or performance data sheet. For reverse osmosis systems, check whether the NSF/ANSI 58 claim includes arsenic reduction, because arsenic is not automatically covered by every RO certification. For non-RO filters, look for a relevant NSF/ANSI 53 arsenic-reduction claim or current third-party test data.
• Filtration Technology: Different water filters use different methods to reduce contaminants. For this list, the RO systems are the stronger starting point for an arsenic-focused drinking-water setup, while Aquasana 3-Stage and Big Berkey BK4X2 should be treated as comparison options unless their current model-specific arsenic data matches your water test.
• Flow Rate and Filter Capacity: Consider the flow rate and filter capacity based on your household’s water consumption. A higher flow rate ensures that you have an adequate supply of purified water when you need it. Similarly, a larger filter capacity reduces the frequency of filter replacements. Find a balance between flow rate and filter capacity that suits your household’s needs.
• Filter Lifespan and Maintenance: Check the filter’s lifespan and the recommended maintenance procedures. Filters with longer lifespans reduce the hassle and cost of frequent replacements. Additionally, consider the ease of maintenance, such as filter replacement and cleaning processes. User-friendly filters with straightforward maintenance routines can make your life easier.
• Additional Contaminant Removal: While your primary concern might be arsenic removal, it’s worth considering filters that can address other contaminants as well. Look for filters that remove chlorine, heavy metals, pesticides, and other harmful substances. This ensures comprehensive water purification and enhances the taste and quality of your drinking water.

Suggested picks from the products above: based on the products reviewed in this guide, these are the most sensible ways to narrow the list:

• APEC ROES-50: choose this first if you want a straightforward under-sink RO system and your priority is arsenic reduction for drinking and cooking water. It is the clearest fit in this article for readers who want a conventional RO setup without paying for extra stages.
• Home Master TMAFC-ERP: choose this if you want a more premium under-sink RO system with higher daily production and remineralization. It makes more sense than a basic RO system when you care about taste, flow, and a fuller kitchen-drinking-water setup.
• iSpring RCC7AK: choose this if you want a budget-friendlier RO option with remineralization. It is a practical middle ground for buyers who want RO filtration but do not want the highest-cost system in the list.
• Express Water RO5DX: consider this if you want a basic 5-stage RO system and the current product documentation supports the contaminant claims you need. Compare its filter replacement cost and under-sink footprint against the APEC option before deciding.
• Aquasana 3-Stage: treat this as a non-RO under-sink comparison, not the default arsenic pick. It may be attractive if you want simpler under-sink filtration, but confirm the exact arsenic-reduction claim for the current model before relying on it for confirmed arsenic contamination.
• Big Berkey BK4X2: consider this only if you specifically want a countertop gravity-fed system and have verified current arsenic test data for the filter elements being used. For confirmed arsenic in drinking water, I would compare it against the RO systems above before making it the primary choice.

Arsenic Water Filter FAQs

1. How does the water filter remove arsenic?

The water filter utilizes a specialized filtration process, such as reverse osmosis or selective filtration, to effectively remove arsenic from the water. These filtration methods physically or chemically separate the arsenic particles from the water, ensuring purified drinking water.

2. What is the filtration capacity of the water filter?

The filtration capacity refers to the amount of water the filter can purify per day or per filter replacement. It varies depending on the specific water filter model but can range from 50 to 75 gallons per day or more, ensuring a steady supply of purified water.

3. How often do I need to replace the filters?

The frequency of filter replacement depends on the specific water filter model, as well as the water quality and usage. Typically, filters need replacement every 6 to 12 months, or when the specified filter lifespan is reached. Regular filter replacement ensures optimal performance and continued removal of arsenic and other contaminants.

4. Is professional installation required for the water filter?

It depends on the water filter model and your level of comfort with DIY installations. Some water filters are designed for easy installation and come with comprehensive instructions, allowing homeowners to install them independently. However, certain models may require professional installation for optimal performance and warranty coverage.

5. Is the water filter certified for arsenic removal?

Many water filters undergo certification by independent organizations, such as NSF/ANSI, to validate their effectiveness in removing arsenic and other contaminants. Look for water filters that are certified to meet specific standards, such as NSF/ANSI Standard 58, which ensures reliable arsenic removal and overall water quality.

6. Does reverse osmosis remove arsenic?

Reverse osmosis can reduce arsenic in drinking water, but performance depends on the system, membrane condition, pre-treatment, water chemistry, and whether the product has relevant certification or test data. If arsenic is confirmed in your water, use lab testing before and after installation.

7. What should I check before choosing an arsenic water filter?

Check your arsenic test result, whether the filter is rated for arsenic III, arsenic V, or both, the certification standard, replacement filter cost, flow rate, installation requirements, and whether the system also handles your other water concerns.

For more detail about how recommendations are evaluated, see our review methodology and editorial policy.

Conclusion

When choosing the best water filter to reduce arsenic, start with a current water test and then match the product to the contaminant claim you need. Among the products listed here, the RO systems are the strongest starting point for an arsenic-focused drinking-water setup, with APEC ROES-50, Home Master TMAFC-ERP, iSpring RCC7AK, and Express Water RO5DX covering different budget and feature needs. Aquasana 3-Stage and Big Berkey BK4X2 can still be worth comparing, but only after you confirm current arsenic-specific performance data for the exact model and replacement filters.