Water Filters

Home Water Filters, Checked

A water filter is only as good as the contaminants it’s actually certified to remove — and “certified” is doing a lot of heavy lifting in this industry. Some systems are certified for the full unit, some only for a single component, and some use the word with no listing behind it at all. This hub is where we sort that out, filter type by filter type.

Here you’ll find our checked guides to whole-house (point-of-entry) systems that treat every tap at once, under-sink and countertop filters for drinking water, shower filters (and an honest look at what they can and can’t do), and fridge filters. Every guide verifies the NSF/ANSI certification listing for the exact model — NSF 42 for taste and chlorine, NSF 53 for health contaminants like lead and PFAS, NSF 58 for reverse osmosis performance, NSF 401 for emerging compounds — and puts the 5-year cost of filters and replacements next to the purchase price.

Not sure where to start? Your water decides for you. If your city’s water tastes like a swimming pool, that’s a chlorine (NSF 42) problem. Worried about lead or PFAS, that’s an NSF 53 or 58 problem. Spots and scale are a hardness problem, and filters don’t fix those at all — head to the softeners hub instead. If you drink from a private well, start with well water.

When our ZIP lookup launches, you’ll be able to start from your own water report instead of guessing. Until then, our water quality hub explains the contaminants worth caring about, and how we check explains exactly how every verdict on this site is earned.

Guides & comparisons