About WaterJury
WaterJury is a database of 215 home water filters and water tests from 65 brands, plus the guides written on top of it. Every number on the site sits next to where it came from: the brand's page or data sheet, a certifier's listing, or a test someone else published.
Why it exists
Product pages promise a long list of contaminants and say “NSF certified” in the same breath, and the two rarely mean the same thing. Of the 137 filters in the database, 72 have a certifier listing for a health claim such as lead or PFOA/PFOS, 20 are listed for chlorine, taste, odor or TDS only, and 81 list substances on the product page that are not in any listing we could find.
Cartridges are the other gap. You pay for the filter once and for its cartridges for as long as you use it. Across the 125 filters with a cartridge price and a replacement interval from the brand, cartridges cost from $13 to $1,897 a year (prices checked Oct 13 to Oct 16, 2026).
So WaterJury puts every model in one table with the same columns, tags every reduction claim as certified or as the brand's own, and the differences show up on their own.
What you'll find here
- A source and a date on every number. Flow, cartridge life, cartridge price, warranty and price link back to the page they were copied from.
- Certifier listings checked model by model. “Certified” appears only with the standard and the substances in the listing, and a note that they are not necessarily in your water.
- The brand's figure next to other people's tests. We don't test products ourselves. We analyze video reviews, lab reports and articles, and say how many tests stand behind each measured number.
- Scores from published rules. Five criteria, 1.5 to 2 points each, all worked out from the database. How we research water filters has the details.
You won't find paid placements, coupon codes or countdown timers.
What WaterJury covers
Water filters, by where they go in the house:
- Under-sink filters: 32 models, 29 certified for health claims
- Reverse osmosis: 20 models, 12 certified for health claims
- Whole-house systems: 12 models, 3 certified for health claims
- Well water systems: 4 models, 0 certified for health claims
- Shower filters: 15 models, 0 certified for health claims
- Pitchers: 14 models, 7 certified for health claims
- Countertop filters: 7 models, 5 certified for health claims
- Countertop RO systems: 9 models, 4 certified for health claims
- Gravity filters: 18 models, 7 certified for health claims
- Faucet filters: 6 models, 5 certified for health claims
water tests for finding out what is in your water before you pick a filter, and water quality by city and state from EPA records and utility reports.
Also hydrogen water bottles: 5 models, compared on published lab reports and specs.
Who runs it
I'm Daryna Klochko, and I write and edit every page on WaterJury. I read the certifier listings, the brand data sheets and the tests other people publish, and I put each number next to the page it came from. Scores follow the rules on the method page, not my taste.
The site is paid for by affiliate commissions, and the affiliate disclosure explains how that works and what it doesn't change. WaterJury doesn't give medical advice, and the health disclaimer says where a filter comparison stops.
Get in touch
Found a wrong number, or want to send a data sheet or a certifier listing? The contact page says how.