Do water filters remove arsenic?

Most ordinary water filters do not remove arsenic. Standard pitcher filters (Brita, PUR, ZeroWater) use granular activated carbon that is not effective against dissolved arsenic and have no NSF/ANSI 58 certification. The technologies that genuinely remove arsenic are reverse osmosis, distillation, and certain specialty media (activated alumina, iron-oxide adsorbents) used in commercial settings. For home use, an NSF/ANSI 58–certified RO system is the standard recommendation. Always check the certification label rather than relying on marketing claims.

What is NSF/ANSI 58 certification, and why does it matter for arsenic?

NSF/ANSI 58 is the American National Standard for residential reverse osmosis water treatment systems. To carry the certification, the system must pass independent lab testing against a list of optional reduction claims — and arsenic V (pentavalent arsenic, the dominant form in chlorinated municipal water) is one of those claims. NSF/ANSI 53 covers other health-effects contaminants but does not cover arsenic, which is why this page focuses on RO. If your water has not been pre-oxidized (e.g., private well water without chlorination), arsenic III (trivalent) may also be present — in that case look for a system that explicitly handles both, or pre-oxidize with chlorine before the RO membrane.

Does reverse osmosis remove arsenic?

Yes. Reverse osmosis is the most reliable home treatment for arsenic. RO membranes have pores small enough to physically reject dissolved arsenic ions, achieving high reduction percentages when the system is NSF/ANSI 58 certified. The Waterdrop G3 series, AquaTru Classic, and AquaTru Carafe on this page all carry NSF/ANSI 58. Maintenance matters: pre-filters need to be replaced on schedule (every 6–12 months) and the RO membrane every 2–3 years to maintain certified performance.

Do whole-house filters remove arsenic?

Generally no. Standard whole-house carbon-block filters do not reduce arsenic — the contact time and media chemistry are not designed for it, and they do not carry NSF/ANSI 58 certification. The correct architecture for arsenic is point-of-use treatment at the sink where you drink and cook (an under-sink or countertop RO system). If you also want shower-water and laundry-water filtration for chlorine and sediment, layer a whole-house carbon system on top of the RO — but the RO is what actually removes the arsenic.

How do I know if arsenic is in my water?

Two paths. First, look up your utility's water quality report by entering your ZIP code on our checker — community water systems are required by EPA to publish arsenic test results in their annual Consumer Confidence Report. Second, if you are on a private well or want lab-verified numbers for your own tap, order a certified water test from a state-certified lab — SimpleLab's Standard or Advanced Home Water Tests both include arsenic and run from a kitchen-sink sample. For the highest-impact regions (Arizona, New Mexico, Nevada, parts of New England, the Upper Midwest), independent testing is the safer call.

Where does arsenic in tap water come from?

Most US arsenic contamination is naturally occurring — groundwater dissolves arsenic from rock and soil deposits, with the highest concentrations in the Southwest (Arizona, New Mexico, Nevada), parts of New England, and the Upper Midwest. Human sources include runoff from past pesticide use on orchards, copper smelting and electronics-manufacturing waste, and some legacy mining operations. Surface-water sources (rivers, lakes) generally have lower arsenic than groundwater. If your utility relies primarily on groundwater wells, your arsenic exposure is likely higher than a neighboring city served by a surface-water reservoir.

How often should I replace an arsenic RO filter?

Follow the manufacturer's published schedule — under-replacement compromises arsenic reduction. Typical guidance: sediment and carbon pre-filters every 6–12 months (depending on water quality and usage), and the RO membrane every 2–3 years. Systems with smart monitoring (Waterdrop G3 P800) display filter-life indicators on the unit. Skipping replacement does not just reduce performance; it can let arsenic break through to the filtered side once the membrane saturates. Set a calendar reminder when you install the system.

Does boiling water remove arsenic?

No — boiling water does not remove arsenic, and in fact it concentrates it. Water evaporates as steam and leaves the dissolved arsenic behind, raising its concentration in the remaining liquid. The same is true for letting water sit out or freezing it. The only effective home methods are reverse osmosis, distillation, and certified specialty media. If you are on a boil-water advisory for bacteria, the boiling addresses the bacteria but does nothing for arsenic — keep using your RO system or bottled water for the arsenic exposure.

What is the cheapest verified way to remove arsenic from drinking water?

The Waterdrop G3 P600 is the lowest-cost NSF/ANSI 58–certified option on this page at roughly $110 (verified April 2026). Annual replacement-filter cost runs around $90–$120 depending on water usage. Pair it with a single Standard Home Water Test from SimpleLab (~$232) once after install to confirm your specific home's arsenic level dropped to non-detect — that one-time test is the credibility check that matters more than the brand on the box. Total first-year cost for verified arsenic removal: under $250.

Best Water Filters for Arsenic Removal (2026)

Q: What are the health effects of arsenic in drinking water?

EPA classifies arsenic as a known human carcinogen. Long-term exposure above the 10 ppb Maximum Contaminant Level is associated with skin damage and circulatory-system problems, plus increased risk of bladder, lung, and skin cancer. Children and pregnant women face higher risk per unit of exposure. Acute high-dose exposure can cause nausea, vomiting, and abnormal heart rhythm. EPA's Maximum Contaminant Level Goal for arsenic is zero, meaning no exposure level is considered safe. Source: EPA 40 CFR 141.62 and the EPA Arsenic Rule.

5 filters tested

Updated April 2026

Reddit-Verified Reviews

Arsenic shows up above EPA's 10 ppb limit in 2,635 US community water systems serving over 215 million people, with the heaviest exposure across Arizona, New Mexico, Texas, and California groundwater systems. We picked 5 NSF/ANSI 58–certified reverse osmosis systems that independently test for arsenic reduction — no pitcher or faucet-mount filter has ever earned the certification, so reverse osmosis (or distillation) is the only verified path.

#	Product	Filter Type	Price	Rating	Certification	Arsenic Removal
#1	AquaTru Carafe Countertop Reverse Osmosis Water Purifier BEST OVERALL	Countertop	$349	4.8	NSF/ANSI 58	Arsenic V reduction per NSF/ANSI 58 certification	View
#2	AquaTru Classic Countertop Reverse Osmosis Water Purifier	RO System	$449	4.8	NSF/ANSI 58	Arsenic V reduction per NSF/ANSI 58 certification	View
#3	AquaTru Classic Alkaline Countertop Water Purifier	RO System	$475	4.8	NSF/ANSI 58	Arsenic V reduction per NSF/ANSI 58 certification	View
#4	Waterdrop G3 P800 Tankless Reverse Osmosis System	RO System	$539	4.6	NSF/ANSI 58	Arsenic V reduction per NSF/ANSI 58 certification	View
#5	Waterdrop G3 P600 Under-Sink Reverse Osmosis System BEST VALUE	Under Sink	$109.99	4.8	NSF/ANSI 58	Arsenic V reduction per NSF/ANSI 58 certification	View

Quick Compare: Best Arsenic Filters

BEST OVERALL

AquaTru Carafe Countertop Reverse Osmosis Water Purifier

Countertop

$349

Arsenic V reduction per NSF/ANSI 58 certification

View Deal

AquaTru Classic Countertop Reverse Osmosis Water Purifier

RO System

$449

Arsenic V reduction per NSF/ANSI 58 certification

View Deal

AquaTru Classic Alkaline Countertop Water Purifier

RO System

$475

Arsenic V reduction per NSF/ANSI 58 certification

View Deal

Waterdrop G3 P800 Tankless Reverse Osmosis System

RO System

$539

Arsenic V reduction per NSF/ANSI 58 certification

View Deal

BEST VALUE

Waterdrop G3 P600 Under-Sink Reverse Osmosis System

Under Sink

$109.99

Arsenic V reduction per NSF/ANSI 58 certification

View Deal

What Reddit Says About Arsenic Filters

Top Reddit Recommendations

AquaTru Classic Countertop RO

User shared lab results showing residual arsenic dropped to ~0.054 ppb (well below EPA's 10 ppb MCL) after AquaTru filtration

“I recently purchased the AquaTru classic countertop reverse osmosis system and sent a water sample for lab testing. Everything looks good except for arsenic and antimony. ... Arsenic level is 5.4E-5 [mg/L]”

r/WaterTreatment

Waterdrop G2 (5-stage tankless)

Recommended for under-sink arsenic removal — tankless design, no storage tank to clean, strong flow

“We're currently running a Waterdrop G2 5-stage and it cranks out the water without a storage tank, taking less space and giving better flow. ... We measure a drop of 350ppm TDS to about 15ppm which is just right for us.”

r/WaterTreatment

Reverse Osmosis (general consensus)

Cross-thread consensus: undersink RO is the standard arsenic recommendation when budget allows; pair with home test kit

“Undersink Reverse Osmosis (RO) systems provide best value for most and a backup to other treatments. Look for independent test results & brands that have been around awhile.”

r/WaterTreatment

NSF certification (any brand)

NSF certification matters more than brand — independent verification is what separates verified arsenic reduction from marketing claims

“I would put weight into NSF certs and brand support. Without NSF certs who knows what reductions you're actually getting, if any. ... The difference between something that's NSF certified and something that isn't, is like using sunscreen but finding out it's just lotion with no UV protection.”

r/WaterTreatment

Common Concerns

•Whole-house carbon filters are not specifically rated to remove arsenic — even when they include KDF media. At any meaningful arsenic level (e.g. 19 ppb), Reddit reviewers consistently push back toward a system explicitly certified for arsenic.
•AquaTru durability complaints surface in long threads — RO membrane clogging within months, pump failure shortly after warranty. Plan for replacement filters on schedule and test water periodically rather than assuming the system holds performance forever.
•Arsenic exists in two forms (arsenic III / arsenite and arsenic V / arsenate) and most NSF-58 certifications cover arsenic V only. Private well water without chlorination may contain arsenic III, which requires pre-oxidation before RO.
•Marketed NSF certifications don't always match what's in NSF's public database. Reddit users repeatedly recommend cross-checking the manufacturer's claim against NSF.org's certified-product search before trusting the label.

Reddit Tips

•Test your water for arsenic both before AND after installing a filter. The 'after' test is the credibility check — multiple Reddit threads describe owners who replaced filters and found arsenic still showing up due to wrong replacement parts or worn-out membranes.
•If you're choosing between whole-house and under-sink, choose under-sink (or countertop) RO at the kitchen sink for drinking water. Whole-house carbon does not reliably reduce arsenic. Layer them only if you also want shower/laundry filtration for chlorine and sediment.
•Verify the exact NSF certification on nsf.org's certified-products database, not just the seller's product listing. NSF/ANSI 58 (RO performance) is the right standard for arsenic — NSF/ANSI 53 alone is not sufficient.
•If you're on a private well, get the type of arsenic identified (III vs V) before buying a system. State or county labs typically run this test for under $50 and the answer determines whether you need pre-oxidation upstream of the RO membrane.

Affiliate Disclosure: We earn affiliate commissions from purchases made through our links at no extra cost to you. This supports our testing and keeps our content free. Learn More

Detailed Filter Reviews

#1 BEST OVERALL

AquaTru Carafe Countertop Reverse Osmosis Water Purifier

AquaTru

(1,040)

$349

Countertop

Arsenic V reduction per NSF/ANSI 58 certification

NSF/ANSI 58

The AquaTru Carafe is a 4-stage countertop reverse osmosis system in a glass-carafe form factor. It carries the broadest NSF certification spread of any product on this page (NSF/ANSI 42, 53, 58, 401, P473, and 372), independently testing for arsenic reduction along with 80+ other contaminants. No installation required — fill the top tank from your tap, and filtered water collects in the carafe below.

Contaminant Removal99% • Excellent

Flow Rate40% • Poor

Value Score80% • Good

NSF-42

NSF-53

NSF-58

NSF-401

NSF-372

NSF-P473

Key Features

NSF/ANSI 58 certified for arsenic reduction (and 53/401/P473 for lead, PFAS, emerging contaminants)
Countertop — no plumbing or installation
Glass carafe (no plastic in the dispense path)
4-stage filtration including RO membrane

Our Review

The Carafe is the strongest single product on this page because it pairs full NSF/ANSI 58 arsenic certification with the broadest contaminant-reduction claim list (PFAS, lead, fluoride, chromium-6, nitrate, mercury, copper, chlorine). The countertop form factor means renters and short-term occupants can use it without modifying plumbing, and the glass carafe sidesteps the plastic-leaching question raised about some carbon-block pitchers. The trade-off is throughput: filling the top reservoir and waiting for RO is genuinely slower than turning on a tap connected to an under-sink system. If you have the budget and the kitchen counter space, the Carafe is the easiest yes on this page.

Pros

+Broadest NSF certification of any arsenic filter we picked
+No plumbing or installation — works for renters
+Glass carafe avoids plastic in the dispense water
+Independent verification via NSF/ANSI 58 + 53 + 401 + P473

Cons

-Slow throughput vs plumbed RO (fill-and-wait countertop design)
-1-gallon dispense capacity — refill more often than under-sink
-Annual filter cost ~$90
-Higher upfront price than basic pitchers

Specifications

Stages

4-stage

Capacity

1 gal

Filter Life

12 months

Annual Filter Cost

$90/year

Warranty

1 year

Removes 10+ Contaminants

Arsenic

Lead

PFOA

PFOS

Fluoride

Chromium-6

Nitrate

Mercury

Copper

Chlorine

Best For

Renters and apartments where under-sink installation isn't possible

Households wanting the deepest NSF certification spread

People who avoid plastic in their drinking water

Check Price on Amazon

#2 BEST VALUE

Waterdrop G3 P600 Under-Sink Reverse Osmosis System

Waterdrop

(199)

$109.99

Under Sink

Arsenic V reduction per NSF/ANSI 58 certification

NSF/ANSI 58

The Waterdrop G3 P600 is an entry-priced tankless under-sink RO system that holds NSF/ANSI 58 certification for arsenic and other heavy-metal reduction. Tankless design means no waiting for a storage tank to refill and a smaller under-sink footprint than legacy 5-stage systems. At ~$110, it is roughly one-third the price of the AquaTru Carafe.

Contaminant Removal90% • Excellent

Flow Rate90% • Excellent

Value Score95% • Excellent

NSF-58

Key Features

NSF/ANSI 58 certified for arsenic reduction
Tankless — fits in tight under-sink cabinets
600 GPD output (genuinely fast for an entry-level RO)
Filter-life indicator built into the unit

Check Price on Amazon

AquaTru Classic Countertop Reverse Osmosis Water Purifier

AquaTru

(536)

$449

RO System

Arsenic V reduction per NSF/ANSI 58 certification

NSF/ANSI 58

The AquaTru Classic is the higher-capacity countertop RO sibling of the Carafe, with a larger filtered-water reservoir and a wider 4-stage filter set. Same NSF certification spread as the Carafe (42/53/58/401/P473/372), but a different reservoir form factor that suits households with multiple drinkers.

Contaminant Removal98% • Excellent

Flow Rate50% • Average

Value Score70% • Good

NSF-42

NSF-53

NSF-58

NSF-401

NSF-372

NSF-P473

Key Features

Same NSF certification spread as the Carafe (42/53/58/401/P473)
Larger filtered-water capacity than the Carafe
Countertop — no plumbing required
4-stage RO filtration

Check Price on Amazon

AquaTru Classic Alkaline Countertop Water Purifier

AquaTru

(45)

$475

RO System

Arsenic V reduction per NSF/ANSI 58 certification

NSF/ANSI 58

The AquaTru Classic Alkaline adds a remineralization stage downstream of the RO membrane, restoring calcium and magnesium that RO would otherwise strip out. Same arsenic-removal capability as the Classic via NSF/ANSI 58 certification; the alkaline stage addresses people who don't like the flat taste of pure RO water.

Contaminant Removal97% • Excellent

Flow Rate50% • Average

Value Score65% • Average

NSF-42

NSF-53

NSF-58

NSF-401

Key Features

NSF/ANSI 58 certified for arsenic + 4-stage RO + remineralization stage
Alkaline post-filter restores calcium and magnesium for taste
Same countertop form factor as the standard Classic

Check Price on Amazon

Waterdrop G3 P800 Tankless Reverse Osmosis System

Waterdrop

(1,255)

$539

RO System

Arsenic V reduction per NSF/ANSI 58 certification

NSF/ANSI 58

The Waterdrop G3 P800 is a higher-capacity tankless under-sink RO system with smart-filter monitoring. Carries NSF/ANSI 42, 53, 58, and 372 — broader cert spread than the G3 P600 and including NSF-53 for additional health-effects claims (but not P473, so no certified PFAS-specific claim). 800 GPD throughput suits multi-person households where sink-side throughput matters.

Contaminant Removal95% • Excellent

Flow Rate95% • Excellent

Value Score75% • Good

NSF-42

NSF-53

NSF-58

NSF-372

Key Features

NSF/ANSI 42, 53, 58, 372 certified — broader than the G3 P600
Tankless design — no holding tank under sink
800 GPD output for multi-person households
Smart-filter monitoring with TDS display

Check Price on Amazon

How We Chose the Best Arsenic Filters

Our recommendations combine laboratory data, real-world user experiences, and value analysis to find filters that effectively remove arsenic from your water.

Certification Verification

We verify all NSF certifications directly with NSF International's database. Claims of 'NSF tested' are not the same as 'NSF certified' — we only recommend filters with verified certifications for the contaminants they claim to remove.

Lab Data Analysis

We analyze each filter's certified test results from NSF International and independent laboratories. We verify contaminant removal rates, flow rate measurements, and filter capacity claims against actual performance data.

Real-World Reddit Analysis

We analyze hundreds of Reddit posts, Amazon reviews, and forum discussions to understand how filters perform in actual homes over months and years of daily use.

Value Assessment

We calculate the true cost of ownership including initial price, filter replacements, and maintenance. The best filter is not always the cheapest upfront or the most expensive.

Buying Guide: Choosing a Arsenic Filter

Arsenic is one of the few drinking-water contaminants where the filter recommendation is genuinely narrow: only NSF/ANSI 58–certified reverse osmosis (or distillation) reliably reduces it. NSF/ANSI 53 filters are not certified for arsenic. This page is therefore intentionally heavy on under-sink RO and countertop RO systems — the form factors that NSF actually tests for arsenic reduction.

Check Certifications

Look for NSF/ANSI certifications that specifically cover the contaminants you need removed. Generic 'NSF tested' claims are not the same as certified performance.

Compare Total Costs

Factor in filter replacements and maintenance, not just the upfront price. A cheaper system with expensive filters can cost more over 2-3 years.

Consider Filter Type

Different filter types suit different lifestyles. Pitchers need no installation but have lower capacity. Under-sink and RO systems require plumbing but offer better performance.

Read Real Reviews

Check Reddit and forums for long-term user experiences. Lab data shows what a filter can do; real reviews show what it actually does in daily use.

Which Filter Type Is Best for Arsenic Removal?

Pitcher Filters

No pitcher filter is currently NSF/ANSI 58 certified for arsenic reduction. Pitcher filters use carbon block media that does not reliably remove dissolved arsenic. If you are renting and a plumbed system is not an option, a countertop RO system (like the AquaTru Carafe) is the closest pitcher-style alternative that genuinely removes arsenic.

Faucet-Mount Filters

Faucet-mount filters are also not NSF/ANSI 58 certified for arsenic. The same carbon-media limitation applies. Use this page's countertop or under-sink RO picks instead.

Under-Sink Filters

Under-sink reverse osmosis systems are the most popular and cost-effective certified arsenic solution. The Waterdrop G3 P600 and AquaTru Classic both carry NSF/ANSI 58 certification with verified arsenic reduction performance, and install in 30–60 minutes without a plumber.

Whole-House Filters

Whole-house carbon filters are not effective for arsenic — the contact time and media chemistry are wrong. The right architecture for arsenic is point-of-use RO at the kitchen sink (where you drink and cook), not whole-house. If you also want shower-water peace of mind, layer a whole-house carbon system on top of an under-sink RO; the under-sink RO is what actually removes the arsenic.

Frequently Asked Questions About Arsenic Filters

The best water filter for arsenic is a reverse osmosis (RO) system carrying NSF/ANSI 58 certification. Our top pick is the AquaTru Carafe — a countertop RO system that is independently certified to NSF/ANSI 42, 53, 58, 401, P473, and 372, removing arsenic along with 80+ other contaminants. For a budget choice, the Waterdrop G3 P600 is an under-sink RO system at roughly one-third the price that also carries NSF/ANSI 58. Activated carbon pitcher filters and faucet-mount filters are not NSF certified for arsenic, no matter how the package is marketed.

Check Your Water for Arsenic

Enter your ZIP code to see if arsenic has been detected in your local water supply and what levels were found.

Check Your Water Quality

Why Arsenic in Your Water Is a Concern

Arsenic occurs naturally in groundwater across much of the US, with the highest concentrations in the Southwest, parts of New England, and the Upper Midwest. The EPA's Maximum Contaminant Level is 10 parts per billion (ppb), but the Maximum Contaminant Level Goal — the level at which no health effects are expected — is zero. Long-term exposure is associated with skin lesions, cardiovascular disease, diabetes, and increased risk of bladder, lung, and skin cancers. Children and pregnant women face higher risk per unit of exposure. Boiling water concentrates arsenic rather than removing it, and standard activated-carbon pitcher filters have no NSF certification for arsenic reduction. Source: EPA 40 CFR 141.62.

Learn more about Arsenic in drinking water →

Best Water Filters for Arsenic Removal (2026)

Quick Compare: Best Arsenic Filters

What Reddit Says About Arsenic Filters

Top Reddit Recommendations

Common Concerns

Reddit Tips

Detailed Filter Reviews

AquaTru Carafe Countertop Reverse Osmosis Water Purifier

Key Features

Our Review

Pros

Cons

Specifications

Removes 10+ Contaminants

Best For

Waterdrop G3 P600 Under-Sink Reverse Osmosis System

Key Features

AquaTru Classic Countertop Reverse Osmosis Water Purifier

Key Features

AquaTru Classic Alkaline Countertop Water Purifier

Key Features

Waterdrop G3 P800 Tankless Reverse Osmosis System

Key Features

How We Chose the Best Arsenic Filters

Certification Verification

Lab Data Analysis

Real-World Reddit Analysis

Value Assessment

Buying Guide: Choosing a Arsenic Filter

Check Certifications

Compare Total Costs

Consider Filter Type

Read Real Reviews

Which Filter Type Is Best for Arsenic Removal?

Pitcher Filters

Faucet-Mount Filters

Under-Sink Filters

Whole-House Filters

Frequently Asked Questions About Arsenic Filters

What is the best water filter for arsenic?

Do water filters remove arsenic?

What is NSF/ANSI 58 certification, and why does it matter for arsenic?

Does reverse osmosis remove arsenic?

Do whole-house filters remove arsenic?

How do I know if arsenic is in my water?

What are the health effects of arsenic in drinking water?

Where does arsenic in tap water come from?

How often should I replace an arsenic RO filter?

Does boiling water remove arsenic?

What is the cheapest verified way to remove arsenic from drinking water?

Check Your Water for Arsenic

Why Arsenic in Your Water Is a Concern

Related Resources

Filter Guides

Contaminant Information

Stay Informed About Your Water Quality