It is growth time for water filters, ever for the reason that EPA introduced that as many as 10 % of US water methods might have unsafe ranges of PFAS, also called “endlessly chemical substances,” within the water. Lead pipes are nonetheless all over, even when they’re now not in Flint, Michigan, as of July 2025. Heck, there are perhaps heavy metals within the groundwater, relying the place you might be, and bottled water dangers extra microplastics.
I do not say this to panic you. Your consuming water might be in compliance with federal requirements, and solely round 4 % of water methods find yourself with unsafe contaminant ranges, based on an EPA research in 2020. This mentioned, native water methods will not need to adjust to the brand new federal PFAS and PFOA maximums for consuming water till 2031.
In response to worries concerning the water provide, a complete new era of water filters are making wondrous guarantees about reductions in contaminants: chlorine, PFAS, heavy metals, stray prescription drugs like acetaminophen, fluoride if that is a fear for you. A few of these are whole-home or under-sink reverse osmosis methods. Others are easy countertop methods, gravity-fed by way of mesh or carbon or different filters.
So how do you kind out which water claims are credible? I have been testing water filters since 2024, typically utilizing chemical indicators and gear, and might attest that it’s not at all times straightforward. This is a fast information to checking up on that water filter that caught your eye.
What Are NSF/ANSI Water Filter Requirements?
The primary predominant sources of consolation for me when assessing water filters are certifications and unbiased testing. Obscure claims of 99 % discount in chlorine or PFAS or arsenic are more durable to belief if the testing is inner to the corporate itself. To be credible, any claims of third-party testing also needs to clearly determine the lab that carried out the testing.
Essentially the most dependable, standardized type of certification is testing in opposition to NSF/ANSI requirements. The NSF, previously referred to as the Nationwide Sanitation Basis, is a Michigan-based, nongovernmental nonprofit based in 1944 that develops and verifies adherence to various completely different testing requirements—together with these for water filters. ANSI, or the American Nationwide Requirements Institute, is an unbiased nonprofit that accredits accreditation and testing organizations just like the NSF.
There are three predominant NSF/ANSI requirements that apply to filters for house consuming water.
- NSF-ANSI 42: Consuming Water Therapy Models—Aesthetic Results.
This certifies removing of gear that are not thought-about dangerous however might have an effect on cosmetics or style of the water. This consists of the chlorine and chloramine utilized by cities to disinfect consuming water. - NSF/ANSI 53: Consuming Water Therapy Models—Well being Results
This certifies removing of any variety of compounds considered dangerous, together with lead, arsenic, PFAS, and others. Every compound is examined individually, amongst greater than 50 attainable contaminants. - NSF/ANSI 401: Rising Compounds/Incidental Contaminants
This certifies filtering of compounds which might be “rising” as potential issues, together with prescription drugs, herbicides, and pesticides.
In case you have the merchandise in hand, these could also be marked on the field. However do not assume certification is the norm. Amongst bathe water filters particularly, just one filter obtained certification from NSF free of charge chlorine removing: the Weddell Duo.
