Two questions, in this order: what is actually in your water, and what — if anything — you need to do about it. Most households buy the filter first and never answer the first question, which is how people end up with a filter certified for the wrong thing.
Our picks
The winners from our cheat sheet, each chosen for one job.
A pitcher from a maker with a 53 lead listing
We could not match this 10-cup model number in IAPMO's file W-17155, so confirm the model in the register. ZeroWater states its filter system is certified by IAPMO R&T to NSF/ANSI 53 for lead (15-gallon rating), and IAPMO's register lists the company's 53 file (checked August 24, 2026).
Certifier record checked · source
A pitcher for chlorine taste and odor
Listed on NSF's register for chlorine, taste and odor reduction (42) and lead-free materials (372); neither is a lead-removal claim.
Certifier record checked · source
Budget under-sink
The low-cost way into under-sink filtration. IAPMO R&T lists the 10UA to NSF/ANSI 42 (chlorine, taste and odor) and 372 (lead-free materials). Neither is a lead-reduction claim.
Certifier record checked · source
Faucet mount with a lead listing
IAPMO R&T lists model FM-3700B (PUR's SKU for this Chrome vertical system) to NSF/ANSI 53 for lead, mercury, total PFAS and VOCs, with the PUR PLUS filter RF-9999 (checked October 23, 2026). Matched to the Amazon listing by title; confirm FM-3700B on the box. It will not fit a pull-out or hand-held faucet.
Certifier record checked · source
Two questions, in this order. First, what is actually in your water — your utility publishes a free annual report, and a home test closes the gap it cannot cover, which is what your own service line and plumbing add. Only then choose a filter certified for what you found. Most households buy the filter first, which is how people end up with one certified for the wrong thing.
1. Find out what is actually in your water. Your utility publishes an annual water quality report and it is free. That covers the water leaving the plant and traveling the mains — it cannot tell you what your own service line and household plumbing add, which for lead is precisely where the problem usually is. A home test closes that gap. How to test your tap water walks through both.
2. Then choose a filter certified for what you found. Not before. This is the step order that saves money, because filters are certified against specific standards and most of the popular ones are not certified for the thing buyers assume.
This is the single most useful thing on this page, and almost every buying guide gets it wrong.
A filter can be genuinely well made, honestly marketed, certified to NSF/ANSI 42, and do nothing measurable about lead. That is not a scandal — it is doing exactly what it says. The mistake is on the buying side, and it is extremely common.
Certifications are listed publicly by the certifying bodies, so a claim on a box can be checked against the register rather than taken on faith.
Water is the vertical with the most live regulatory activity right now — lead service line replacement requirements and drinking-water limits for PFAS are both in motion, and both change what utilities have to tell you.
We will keep this section current as those obligations land, because "what your utility owes you" is the part most likely to change under you.
We sequence this test-first, because a filter is only useful against a contaminant it is certified to reduce. We check the specific NSF/ANSI standard a product is certified to rather than repeating a marketing phrase, and we are explicit that the common certification — 42, for taste and odor — is not a health claim at all.
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NSF/ANSI 42 is the certification most commonly printed on filter packaging, and it is an aesthetic claim — taste, odor, particulates. It is not a lead claim. For lead you want NSF/ANSI 53.
The science, briefly
NSF/ANSI 42 covers aesthetic effects — chlorine taste, odor, particulates. It is not a health claim and not a lead claim, and it is the certification most commonly printed on filter packaging. NSF/ANSI 53 covers health effects, and it is the standard that covers lead, VOCs, cysts and similar. NSF/ANSI 58 covers reverse osmosis systems. NSF/ANSI 372 means the device's own materials are lead-free, which is useful and is not a statement about what the filter removes from your water.
A filter can be genuinely well made, honestly marketed, certified to NSF/ANSI 42, and do nothing measurable about lead. That is not a scandal — it is doing exactly what it says. The mistake is on the buying side, and it is extremely common.
Certifications are listed publicly by the certifying bodies, so a claim on a box can be checked against the register rather than taken on faith.
Common mistakes
Certified against which standard? NSF/ANSI 42 is taste and odor. Lead lives under NSF/ANSI 53. The word "certified" on its own carries no information about what is removed.
It tells you about the water leaving the plant and traveling the mains. It cannot tell you what your own service line and household plumbing add — which, for lead, is precisely where the problem usually is. A home test closes that gap.
That order is what produces a filter certified for the wrong thing. Testing first costs little and decides which certification number you actually need.
Start here
Pitchers, under-sink and shower — matched to contaminant, not to marketing.
See picksWhich are named in a certifier's register for the shower-filter standard, and what that standard leaves out.
See picksThe cheapest useful upgrade for a family, and its limits.
See picksWhat we'd buy
Manufacturer statement checked · source
Go deeper
more than 98 percent of U.S. residents tested are carrying PFAS in their blood or tissue
— In 2019-05-15 testimony, Erik D. Olson, JD cited ...
Testimony of Erik D. Olson - PFAS — U.S. House Committee on Energy and Commerce (2019-05-15)
112.3 million people got their water from systems that detected lead at or above the 5 ppb lead level
— In 2026-02-24 testimony, Erik D. Olson, JD cited ...
Testimony of Erik D. Olson, Senior Strategic Director for Health, NRDC — U.S. House Committee on Energy and Commerce, Subcommittee on Environment (2026-02-24)
prevent up to 200,000 IQ points lost in children
— In 2026-02-24 testimony, Erik D. Olson, JD cited ...
Testimony of Erik D. Olson, Senior Strategic Director for Health, NRDC — U.S. House Committee on Energy and Commerce, Subcommittee on Environment (2026-02-24)
