Which Water Filter Brands Actually Remove Pesticides?

A carbon filter only stops pesticide residue when the specific media and cartridge have actually been tested against a named compound, not just because the word "filter" is on the box. That distinction matters most if a well sits near a cornfield, golf course, or land treated with herbicide. Aquasana, PUR, Multipure, Clearly Filtered, and Berkey earn a spot in this comparison because each has published a named pesticide compound and a percentage behind it. Viomi's reverse osmosis systems take a different, broader route: a 0.0001-micron membrane physically rejects pesticide and herbicide molecules by size, the same mechanism documented industry-wide for RO, backed by SGS-verified named-compound data on PFOS, PFOA, and lead. A standard Brita-style pitcher, with no compound-specific data at all, isn't a real pesticide solution no matter how it's marketed.

Why Most Basic Filters Miss Pesticides

Standard activated carbon pitchers and fridge filters are built and certified around chlorine, taste, and odor. That's a real, useful job, but it's a narrower one than most shoppers assume when they see "filter" on the label.

Pesticides and herbicides are organic chemical compounds. How well a filter handles them depends on the specific media and contact time, not just the presence of carbon. Basic granular carbon, the kind in most low-cost pitchers, typically packs a small amount of carbon into a fast-flowing cartridge. A lot of dissolved organic molecules pass through before the carbon can adsorb them. Denser carbon block media, the kind used in systems certified for pesticide reduction, packs more carbon into the cartridge and slows the water down, which gives it more contact time with the adsorptive media. Certification and contact time matter more than the word "carbon" by itself.

Pesticides also don't behave uniformly. Glyphosate binds tightly to soil particles and tends to stay put once it's in the ground. Atrazine is much more water-soluble and mobile, so it leaches into groundwater faster and shows up more often in well water near farmland. A filter tested against one compound can't be assumed to perform the same way against another. That's why the brands below are grouped by what they've named and tested rather than by a blanket "removes pesticides" claim.

What Removes Pesticides at Home

Three mechanisms show up across the brands that document real pesticide performance, and each works differently. A peer-reviewed study published in Environmental Pollution in November 2023 tested nine home water-treatment methods against 13 pesticides at realistic concentrations. Only activated carbon and reverse osmosis brought pesticide levels down to near-undetectable amounts across most of the compounds tested; basic membrane filtration on its own performed poorly. A "membrane filter" claim on a label isn't automatically the same as a certified RO system.

Reverse osmosis (RO) forces water through a semi-permeable membrane with pores small enough to reject dissolved molecules mainly by size, though charge, polarity, and the membrane's own material also affect how well a given compound is rejected, so size alone doesn't tell the whole story. Because most pesticide and herbicide molecules are larger than the membrane's pore size, RO systems reject a large share of them, the same process that lowers overall total dissolved solids (TDS). Most RO systems also route water through carbon stages before and after the membrane, which adds adsorption on top of the membrane's size-based rejection.

Certified activated carbon relies on adsorption, meaning pesticide molecules chemically bind to the carbon's surface as water passes through. This is the mechanism behind several brands' carbon-based systems:

• Multipure's solid carbon block systems
• Clearly Filtered's proprietary Affinity Filtration media
• Aquasana's Claryum under-sink cartridges
• PUR's granular-carbon cartridges

Performance depends heavily on contact time, the specific carbon formulation, and how much of the cartridge's rated capacity remains. A carbon system that's certified or independently tested for named pesticide compounds performs very differently from an uncertified pitcher that just happens to contain carbon, which is why PUR's faucet-mount filter carries a named NSF/ANSI 53 atrazine claim while a generic granular-carbon pitcher with no such testing doesn't.

Gravity filtration, the approach Berkey uses, also relies on adsorption through its element media, but with much longer contact time than a fast-flow tap filter since water sits and drips through by gravity alone rather than under water pressure. That slower pace is part of why Berkey's published herbicide and pesticide data covers such a wide compound panel.

The practical takeaway: look for a specific compound named on a certification or an independent lab report, ideally atrazine, glyphosate, 2,4-D, or another named pesticide or herbicide, rather than a generic "removes pesticides" line with no data behind it.

NSF/ANSI 53 is the standard most directly relevant here, since it covers a defined list of pesticides and herbicides (including atrazine, alachlor, lindane, and 2,4-D among others) under its health-effects contaminant reduction claims. A given product's NSF/ANSI 53 certification only covers the specific compounds or claim bundle it was tested and listed for, not the standard's entire possible list. Confirm the exact certificate rather than trusting the "NSF/ANSI 53" label by itself.

NSF/ANSI 401 is a separate, newer standard covering 15 "incidental" or emerging contaminants. It includes a handful of pesticide-adjacent compounds like DEET, metolachlor, and linuron that aren't part of NSF/ANSI 53's list. The two standards aren't interchangeable, and a product certified to one doesn't automatically meet the other's compound list.

Do You Need to Worry About Pesticides in Your Water?

Your water source is what determines pesticide risk, not your zip code. The EPA regulates a number of pesticides and herbicides under the Safe Drinking Water Act, including atrazine, capped at a maximum contaminant level of 3 parts per billion, and glyphosate, capped at 700 parts per billion. Municipal water systems are required to test for these and stay under those limits, and utilities publish the results in an annual water quality report (sometimes called a Consumer Confidence Report) that's public and worth checking before assuming a filter is necessary.

That public reporting only covers municipal customers, though. Private wells are the bigger blind spot: nobody tests well water for you, and wells near cropland, golf courses, or areas with heavy lawn-care chemical use are at meaningfully higher risk of pesticide runoff reaching groundwater, especially after rain.

A lab water test, not a guess based on taste or clarity, is the only reliable way to know whether pesticides are present in your specific water and at what concentration. None of these compounds have a distinct taste, smell, or color at the levels typically found in drinking water.

EPA maintains a state-by-state directory of certified drinking water laboratories, a more reliable starting point than a generic mail-in kit. A county extension office or state health department can also point to the nearest certified lab and explain which pesticide panel makes sense for the crops grown nearby, since panel scope and pricing vary by lab and by how many compounds are tested.

6 Water Filter Brands and What Evidence They Have

The six brands below carry three different tiers of proof, and that difference matters more than the price tag when you're comparing them. A named NSF/ANSI 53 certification means an accredited lab tested that exact model against a defined pesticide/herbicide list and it passed. An independent lab test without that certification is still real third-party data, but it wasn't verified against a standard's full protocol. A brand's own contaminant list with no lab or percentage cited is the weakest tier of evidence and shouldn't be treated the same as the other two.

Prices vary by model, so confirm the certification against the specific product before buying.

Note the evidence-type differences in the table too. Aquasana's atrazine claim and PUR's faucet-mount atrazine claim sit on certificates that name the compound directly. Multipure's comes from an NSF-defined VOC Reduction category that bundles in specific pesticides by the standard's own definition. Clearly Filtered's and Berkey's come from independent lab testing the brands publish themselves, real third-party data, but a different tier of verification than a named certification. Viomi's RO systems carry real NSF/ANSI certifications for other named contaminants, backed by the same size-based rejection mechanism documented industry-wide for pesticides, without a test that names a pesticide compound specifically yet.

Viomi

Viomi's flagship reverse osmosis system for this category is the Viomi M1. The membrane rated at 0.0001 microns sits at the center of the pesticide question: that pore size is well below the roughly 0.6-to-1-nanometer molecular diameter of most pesticide and herbicide compounds, the size gap that lets a tight RO membrane reject them mechanically rather than relying on adsorption alone.

That membrane is the last of nine sequential filtration stages the Viomi M1 runs water through as a tankless under-sink system. Carbon pre-filtration and carbon polishing add adsorption on top of the membrane's size-based rejection, the same two-part mechanism, size rejection plus carbon adsorption, documented industry-wide for RO pesticide removal.

Viomi backs that mechanism with independent proof on the contaminants it has tested for by name. SGS-verified reduction rates run above 99% for PFOS, PFOA, and lead, third-party lab data rather than a self-reported marketing claim. The Viomi M1 also carries NSF/ANSI 58 certification for TDS reduction, NSF/ANSI 42 certification for chlorine, taste, and odor, and NSF/ANSI 372 certification for lead-free construction. Viomi hasn't run an SGS challenge test naming a specific pesticide compound yet, so treat pesticide reduction as a well-documented physical outcome of the membrane's size-based mechanism, the same mechanism the Environmental Pollution study above found effective, rather than a lab-tested percentage the way Multipure or Aquasana publish.

For a well owner juggling several contaminants at once, that combination, size-based molecular rejection backed by SGS-verified heavy-metal and PFAS data, is what actually determines whether one under-sink unit can replace several single-purpose filters. Most well owners near farmland aren't dealing with pesticides in isolation; PFAS, lead, and elevated TDS tend to show up on the same water test, and that's the case the Viomi M1 is built to handle in one pass. If pesticides are genuinely the only concern in the house, Multipure or Aquasana's named compound certifications are the more direct paperwork trail for that specific job. At $799.99, the Viomi M1 also remineralizes water afterward and needs under-sink space and a drain connection, standard for any RO system.

For a lower price point, the Viomi V8 PRO ($479.99) runs the same 9-stage tankless format at 800 GPD and adds NSF/ANSI 53 certification alongside 42, 58, and 372. Per Viomi's product page, that NSF/ANSI 53 certification targets PFOA/PFOS, lead, copper, arsenic, nitrate, and fluoride specifically, not the standard's separate pesticide/herbicide compound list. It's a real certification, just not evidence of pesticide performance on its own.

Viomi's entry-level 0.5-micron under-sink carbon filter ($78.99) is a solid budget option for lead, chlorine, and taste, but it isn't the right pick if pesticide reduction specifically is the priority. Its NSF/ANSI 53 certification covers PFAS, PFOA/PFOS, and lead, not a pesticide/herbicide compound list, and its single-cartridge carbon design isn't purpose-built or certified for pesticide reduction the way dense carbon block systems are.

If pesticides are the only or top concern, Multipure or Aquasana's named certifications are the more direct match regardless of budget. Viomi's line fits better once PFAS, lead, or arsenic are also on the list of things to solve for.

Aquasana

Aquasana skips reverse osmosis for its AQ-5300+ under-sink filter, running water instead through three stages of its Claryum carbon media, so it needs no drain connection and produces no reject water. Per Aquasana's own site, it's NSF/ANSI 42, 53, and 401 certified, and its published performance data sheet names atrazine directly: a tested influent of 0.100 mg/L came down to 0.003 mg/L, a reduction above 97%. That's the kind of model-specific, traceable number this whole comparison is built around, an atrazine claim tied to Aquasana's own testing rather than a general marketing line.

The tradeoff compared to Viomi's RO line is that carbon alone won't reduce dissolved salts or TDS the way a membrane does, so it fits best when pesticides, chlorine, and a handful of other named contaminants are the specific concern rather than overall water purity.

PUR

PUR sells two different certified pesticide claims under two different cartridges, and they aren't identical.

• PUR PLUS pitcher cartridge (PPF951K): NSF/ANSI 42, 53, and 401 certified, with named simazine reduction above 98.3% and methoxychlor above 81.1%. No atrazine claim.
• PFM400H faucet-mount filter (RF9999/RF3375): Its own NSF/ANSI 42, 53, and 401 certification, with atrazine reduction above 93.9% alongside simazine. Cartridge is rated for 100 gallons, roughly three months of typical use.

At roughly $25 to $40 depending on format, either cartridge is a cheap way to get an actual certified pesticide claim in this comparison, but anyone specifically after the atrazine claim needs the PFM400H faucet mount, not the PLUS pitcher. Both are a reasonable stopgap for renters or anyone who wants a documented certification before committing to a bigger system.

Multipure

Multipure skips reverse osmosis entirely. Its solid carbon block systems, sold under names including Aquapremier, Aquaperform, Aquaversa, and Aqualuxe, won't reduce total dissolved solids the way an RO system does, but they also don't need a drain connection or produce reject water.

What they carry instead is an NSF/ANSI 53 certification for what the standard calls a "VOC Reduction" claim, along with NSF/ANSI 401 certification on the Aquapremier, Aquaperform, Aquaversa, and Aqualuxe models. That VOC Reduction category covers more than industrial solvents like benzene and carbon tetrachloride; NSF's own definition names a specific set of pesticides and herbicides too:

Multipure's own site describes the certification as VOC reduction rather than listing every pesticide individually, but the claim it holds is defined by NSF to include them. Aquasana's AQ-5300+ draws its atrazine number from this same NSF/ANSI 53 VOC surrogate-testing mechanism and compound bundle, so the two brands' pesticide-relevant certifications land in the same evidence category rather than one covering meaningfully more ground than the other. Multipure sells several models, including Aquapremier, directly through its own site at posted prices (Aquapremier runs about $895 for the base system as of August 2026), though pricing and availability vary by model, and Aqualuxe was listed as out of stock when checked.

Clearly Filtered

Clearly Filtered's lineup includes pitcher, under-sink, and fridge formats built around a proprietary carbon-based media the company calls Affinity Filtration. The pitcher's main draw is that it needs no installation at all, and the published pitcher data behind it is unusually deep for a brand-run lab test: atrazine above 99.81% (from 53.2 µg/L down to below 0.1 µg/L), glyphosate above 99.99%, and 2,4-D above 99.98%, part of a panel the brand says covers more than 25 herbicide and pesticide compounds.

The catch is where that data comes from. Clearly Filtered's formal NSF listing covers NSF/ANSI 42 and 372, while the pesticide and herbicide numbers are independent lab data the brand publishes itself rather than a formal NSF/ANSI 53 certification the way Multipure, PUR, or Aquasana carry, a real but different tier of third-party verification.

Berkey

Berkey's gravity systems don't need electricity or a plumbing connection, and they come in two tiers of pesticide-relevant evidence, per the brand's own published test summaries. The standard Black Berkey elements, tested by Envirotek Laboratories according to Berkey's site, reduced atrazine and 2,4-D to below detectable levels and lindane to below detectable levels, with glyphosate reduced by more than 75% (a figure limited by the lab's detection method, not necessarily a ceiling on the element's actual performance).

Berkey's Phoenix Elements are a separate, higher-cost upgrade over the standard Black Berkey elements, not a second filter needed alongside them, and they go further: RAYNU Analytical lab testing shows glyphosate and 2,4-D reduced by more than 99.9%, alongside a broader panel of 50-plus pesticides and herbicides also above 99.9%, again per Berkey's published data. Phoenix Elements carry NSF/ANSI 42 and 372 certification on the specific systems Berkey lists for that certification, so it's worth confirming the exact model rather than assuming every system sold with Phoenix Elements is covered. Berkey also restricts direct shipping to some states, so check availability before ordering.

The tradeoff with gravity filtration generally is speed. You fill the top chamber and wait for water to filter through by gravity, which is slower than a tap-connected system but works anywhere, including apartments and off-grid situations with no under-sink access at all.

How to Verify a Brand's Pesticide Claim Yourself

Before trusting any product page, including this one, run your own quick check:

1. Look up the exact model on the NSF or IAPMO public certification database, not just a badge image on the product page. Certifications are tied to specific models and specific contaminants, not brand names in general.

2. Check which standard the pesticide claim falls under. NSF/ANSI 53 covers a defined pesticide/herbicide list (atrazine, alachlor, lindane, and others); NSF/ANSI 401 covers a different, smaller list of emerging compounds (DEET, metolachlor, linuron). A product certified to one doesn't automatically cover the other.

3. See whether a specific compound is named, not just the word "pesticides." A named compound with a tested percentage, like atrazine at 99.9%, is a real, checkable claim. "Reduces pesticides" with no compound or number attached is marketing language.

4. Confirm whether it's certified or independently tested. Both are legitimate forms of evidence, but a formal NSF/ANSI certification means an accredited lab verified the claim against the standard's full protocol, while independent testing a brand publishes itself is real third-party data collected outside that specific protocol.

Which Type of Filter Fits Your Situation

• Well water near farmland or heavy agricultural use, want a broad certified compound list: Multipure's and Aquasana's NSF/ANSI 53 certifications both cover the same defined pesticide/herbicide bundle (atrazine, alachlor, simazine, and others), making either a solid pick for this use case.

• Want the deepest independently tested data on specific herbicides like glyphosate and 2,4-D, no plumbing required: Berkey's Phoenix Elements publish the broadest tested panel, though as an add-on purchase over the base system.

• Pesticides are one concern among several (also worried about PFAS, lead, arsenic, or high TDS) and you want it handled in one under-sink system: the Viomi M1 or Viomi V8 PRO cover that broader list with SGS-verified numbers on PFOS, PFOA, and lead, though neither publishes a standalone pesticide certification or percentage; if pesticides are the only concern, look at Multipure or Aquasana instead.

• Renting or no plumbing access, want the cheapest certified pesticide claim: PUR's faucet-mount filter (the atrazine-certified PFM400H) runs about $25-40; its pitcher cartridge covers simazine instead if that's the specific compound of concern.

• Want a plumbed under-sink filter with a certified atrazine number but no RO drain line or reject water: Aquasana's AQ-5300+ publishes its own performance data sheet showing atrazine reduced above 97%.

• Want a pitcher with zero installation and the deepest published herbicide panel: Clearly Filtered's own lab data covers 25-plus compounds, including atrazine above 99.81% and glyphosate above 99.99%, ahead of what Multipure or Berkey publish for a pitcher format specifically.

• Tight budget, mainly concerned with lead, chlorine, and taste, pesticides are a secondary concern: Viomi's entry-level under-sink carbon filter or a basic PUR cartridge cover the basics affordably; step up to a certified pesticide-specific option above if that documentation becomes the priority.

• Budget isn't the constraint and you want both the smart RO experience and a dedicated pesticide certification: pairing a Viomi M1 or Viomi V8 PRO under the sink with a certified add-on like PUR's faucet-mount filter or Aquasana's AQ-5300+ covers the broader contaminant list and a named pesticide claim at the same time.

FAQ

Do Brita or PUR pitchers remove pesticides? Most don't. Standard Brita pitchers and PUR's basic (non-PLUS) cartridges are certified mainly for chlorine, taste, and odor, not pesticides. PUR PLUS is the exception, though the specific cartridge still matters: the pitcher cartridge is certified for simazine, while the separate faucet-mount filter is certified for atrazine. Check which one you have before assuming either compound is covered.

Does boiling water remove pesticides? No, and it can make things worse for some compounds. Boiling evaporates water while non-volatile pesticides stay behind, which can concentrate them in the remaining water rather than removing them.

Is well water more likely to have pesticides than city water? Generally yes, if the well is near cropland, golf courses, or areas with heavy lawn-care chemical use. Municipal water is tested and regulated under EPA limits, but private wells aren't tested by anyone unless the owner arranges it.

What's the difference between NSF/ANSI 53 and NSF/ANSI 401 for pesticides? NSF/ANSI 53 covers a defined list of pesticides and herbicides, including atrazine, alachlor, and lindane, as part of its broader health-effects contaminant standard. NSF/ANSI 401 is newer and covers a separate list of 15 emerging or incidental contaminants, which includes a few pesticide-adjacent compounds like DEET, metolachlor, and linuron that 53 doesn't name. Certification to one doesn't cover the other's list.

Does reverse osmosis remove all pesticides? Not literally all of them, but RO membranes reject most dissolved organic pesticide molecules mainly by size, though charge and membrane chemistry also affect rejection for specific compounds, as part of the same process that reduces overall TDS. Most RO systems also add carbon stages before and after the membrane for additional adsorption.

How do I know if my water actually has pesticides in it? A lab water test is the only reliable way to know. Pesticides at typical drinking-water concentrations don't have a distinct taste, smell, or color, so you can't tell by drinking it. Municipal customers can also check their utility's annual water quality report for pesticide test results.

Bottom Line

Start with a water test, not a brand name. A lab result naming a specific pesticide compound and concentration is what turns this from guesswork into an actual purchase decision.

If that test flags a named pesticide as the primary concern, Multipure's and Aquasana's NSF/ANSI 53 certifications draw on the same defined compound bundle, so neither one covers meaningfully more ground than the other. Clearly Filtered publishes the deepest independently tested herbicide panel for a pitcher, and Berkey's Phoenix Elements do the same for a no-plumbing, gravity option. PUR's faucet-mount filter (the atrazine-certified PFM400H) and Aquasana's AQ-5300+ both carry real NSF/ANSI 53 atrazine certifications at a lower price and simpler installation than a full RO system.

If that test, or just a general concern about well water near farmland, turns up pesticides alongside PFAS, lead, or elevated TDS, which is the more common real-world picture for well owners, a single-purpose pesticide filter only solves part of the problem. That's the real choice at the center of this comparison: a certified pesticide filter defends one contaminant well, while the Viomi M1 or Viomi V8 PRO's 0.0001-micron RO membrane rejects pesticide-sized molecules by the same physical mechanism documented across this roundup, backed by SGS-verified PFOS, PFOA, and lead reduction above 99%, and handles the rest of a well's typical contaminant list in the same pass.

For a household that wants one system covering the full range instead of a shelf of single-purpose filters, that's the case for starting with Viomi.