Best water filters, by what you are actually filtering

There is no best filter

There is only a filter certified for the contaminant you are trying to remove — which is why this page is organized by problem rather than by rank.

And it starts one step earlier than most guides: test first. Buying filtration before knowing what is in your water is the most expensive mistake in this category, and it is the standard one.

The certification table, because this is where people lose money

Standard	What it actually covers
NSF/ANSI 42	Aesthetic — chlorine taste, odor, particulates. Not a health or lead claim.
NSF/ANSI 53	Health effects — lead, VOCs, cysts. This is the lead one for filters.
NSF/ANSI 58	Reverse osmosis systems. Lead is covered only where the model's listing names it
NSF/ANSI 372	The device's own materials are lead-free — about the filter, not your water

NSF/ANSI 42 is the certification most commonly printed on filter packaging, and it is the one most commonly mistaken for a safety claim. A filter can be well made, honestly marketed, certified to 42, and do nothing measurable about lead — because that is not what it was certified to do.

Certifications are published in searchable public listings. A claim on a box can be checked against the register in about a minute, and for anything health-related it is worth the minute.

By what you are filtering

If lead is why you are here, the certification to look for is NSF/ANSI 53, and you should verify it in the listing for the specific model rather than trusting the marketing. Our top pick is ZeroWater, a pitcher from a maker with a 53 lead listing: its lead claim is a certification against NSF/ANSI 53 (IAPMO R&T). We could not match the 10-cup model number in its file, so confirm that. Brita's Elite filter, below, also has a 53 lead listing, in named pitchers only. Culligan ZeroWater's own published wording is specific about what it holds and what it covers: the 5-stage filter and compatible pitchers are "system certified by IAPMO R&T against NSF/ANSI Standard 42 for reduction of chlorine taste and odor and against NSF/ANSI Standard 53 for reduction of lead, chromium (Hexavalent), PFOA, PFOS and mercury for 15-gallon capacity" (checked on ZeroWater's own site, September 10, 2026). Note the last four words. Fifteen gallons is a short rated life — call it a few weeks for a household drinking from it — and running past the rating means you are no longer protected. The bundled TDS meter is genuinely useful here, because it makes exhaustion visible rather than theoretical. Be clear about what TDS is and is not: it measures dissolved solids, which makes it a good exhaustion indicator and a poor safety instrument.

A word about the pick this replaced. Until this update the top pick here was the Clearly Filtered pitcher, on the reasonable-sounding grounds that it is positioned squarely at lead. Held against the table above, that did not survive. Clearly Filtered's own performance-data page states the pitcher is "certified by NSF to NSF/ANSI Standards 42 and 372" — the aesthetic standard and the lead-content-of-the-materials standard, which are precisely the two this page warns are not lead claims. Its lead figure, 99.34% reduction, comes from "additional testing" by an independent ISO 17025 laboratory "capable of testing following NSF/ANSI protocols" rather than from a certification (both quotes checked September 10, 2026). That is more published data than most of this category offers and we still list it. It is not a certification you can look up, which is the thing this page tells you to require, so we no longer recommend it for lead, and say why.

If you want filtered water at the faucet without plumbing, a faucet mount is the no-plumbing route. The PUR PLUS vertical faucet system (model FM-3700B, with the RF-9999 filter) is listed to NSF/ANSI 53 for lead by IAPMO R&T. Check your faucet first: it is not designed for pull-out or hand-held models. If you want a plumbed-in system with a lead listing, the Aquasana Claryum 3-Stage Max Flow is listed to 53 by WQA. And if you already own a Brita pitcher, the Brita Elite filter is listed to 53 for lead, but only inside the pitchers and the Ultramax dispenser on that listing.

If you want reverse osmosis, read the model's own listing, because NSF/ANSI 58 certifies a system only for the claims on that listing and the claims differ. IAPMO's register lists the Waterdrop G3P600 under NSF/ANSI 58 for a set that includes lead, but the Performance Data Sheet on Waterdrop's product page does not list lead, so we could not confirm it; the APEC ROES-50 is listed for TDS only. APEC's own page also states "Removes a wide variety of contaminants including arsenic, bacteria, lead, fluoride, chromium, radium and more," which is a manufacturer claim and not what the register lists for this model. Both need plumbing, and both waste water as they filter.

If it is taste, chlorine and general improvement, you have far cheaper options and the common NSF/ANSI 42 certification is genuinely the right one. The Waterdrop 10UA under-sink unit does this well at a low price, and the CuZn UC-200 claims an unusually long five-year cartridge life, though we could not confirm its certification. Five years is the brand's figure; check the gallon rating too.

If it is the shower and the bath, that is a different product and a different job — chlorine on skin rather than anything you drink. Our shower filter guide covers which shower filters are named in a certifier's register and what that standard does and does not test, and our bath filter review covers the bath.

The cost nobody quotes

The unit price is the small number. Cartridges over three years are the real cost, and the ranking changes substantially once you include them — a cheap housing with expensive cartridges on a short cycle is routinely the most expensive option on a shelf.

Hard water shortens every cartridge's life below its rating, so if your utility report says hard, plan on changing sooner than the box claims.

And write the change date on the housing. Past its rating a filter stops doing what it was certified to do, and some media can shed part of what they have captured.

Prices come from the live catalog and can change; check the retailer before you buy.