The "best" water filter depends entirely on what's in your water and how much you want to filter. A pitcher is perfect for renters and drinking water; an under-sink reverse-osmosis system gives you near-pure water on tap; and a whole-house system treats every faucet and shower in the home. Below, we've picked a standout for each approach.
One tip before you buy: check your local water quality report (or run an at-home test) so you know what you're actually trying to remove. Then match a filter certified to handle it. As always, we don't quote prices — tap through to Amazon for the current one.
In this guide
How to choose a water filter
- Know your water. City water usually means chlorine and possibly lead or PFAS; well water can mean bacteria and sediment. Test first.
- Match the filtration method. Reverse osmosis removes the most (including PFAS, fluoride, and dissolved solids); carbon block handles chlorine, taste, and many chemicals; gravity systems are great off-grid.
- Look for certifications. NSF/ANSI standards 42, 53, 58, and 401 tell you exactly what a filter is verified to reduce.
- Factor in replacement filters. The upfront price is only part of the cost — check how often filters need changing and what they cost.
1. AquaTru Classic Countertop
Best countertop
AquaTru Classic Countertop
Reverse-osmosis purity, no plumbing required.
The AquaTru brings four-stage reverse osmosis to your countertop with zero installation — just fill and pour. It's independently certified to reduce a long list of contaminants including lead, chlorine, PFAS, and fluoride, making it one of the most thorough options you can own without a plumber. A favorite in the non-tox community for good reason.
2. Aquasana Whole House System
Best whole-home
Aquasana Whole House System
Filtered water at every tap and shower.
If you want cleaner water throughout the entire home — including the showers, where you absorb chlorine through skin and steam — a whole-house system is the ultimate upgrade. Aquasana's high-capacity carbon and KDF filtration treats hundreds of thousands of gallons with a salt-free softener option, and it's built to run for years. A true investment in your home.
3. Big Berkey Gravity System
Best gravity system
Big Berkey Gravity System
Powerful filtration, no electricity needed.
The Big Berkey is a cult classic: a stainless-steel countertop system that filters water by gravity alone, so it works during power outages and off-grid. Its Black Berkey elements tackle a huge range of contaminants while leaving beneficial minerals, and the long-lasting elements make it economical over time. Beloved by preppers and clean-water devotees alike.
4. Waterdrop G3P800 Under-Sink RO
Best under-sink
Waterdrop G3P800 Reverse Osmosis
Endless purified water, hidden away.
For purified water straight from a dedicated faucet, this tankless under-sink RO system is hard to beat. Its fast 800-gallon-per-day flow means no waiting, the multi-stage filtration is NSF-certified to reduce a broad range of contaminants, and a smart display tells you filter life at a glance. Tucks neatly under the sink for a clutter-free counter.
5. Clearly Filtered Water Pitcher
Best pitcher
Clearly Filtered Water Pitcher
Pitcher convenience, serious filtration.
Most pitchers do little more than improve taste. Clearly Filtered is the exception: its Affinity filtration is independently tested to target 365+ contaminants including lead, PFAS, fluoride, and microplastics, while leaving healthy minerals. If you want meaningful filtration without any installation, this is the pitcher to buy.
6. Epic Pure Water Filter Pitcher
Best budget pitcher
Epic Pure Water Filter Pitcher
Impressive filtration at an easy price.
Epic Pure delivers a lot of filtration for the money, with a long-life filter certified to reduce lead, PFAS, chlorine, and more. The larger filter means fewer replacements than typical pitchers, and it's a fantastic entry point if you're just starting to clean up your drinking water without a big upfront spend.
Frequently asked questions
Do water filters remove PFAS "forever chemicals"?
Some do. Reverse-osmosis systems (like AquaTru and Waterdrop) and certain high-performance pitchers (like Clearly Filtered) are tested to reduce PFAS. Standard carbon pitchers generally aren't. Always check the certification for PFAS specifically.
Is reverse osmosis water too "stripped" of minerals?
RO does remove minerals along with contaminants. It's not a problem for most people who eat a balanced diet, but if it concerns you, choose a system with a remineralization stage, or add trace mineral drops to your water.
Should I filter my shower water too?
It's worth considering. You absorb chlorine through your skin and by breathing in steam. A whole-house system handles this for every shower; alternatively, a dedicated shower filter is an inexpensive add-on.
How do I know which contaminants are in my water?
Start with your municipal water quality report (utilities publish these annually), or use an at-home water test kit for a personalized picture — especially important for well water.
Why don't you show prices?
Water filter prices — especially systems — change often with sales and bundles. We link you to the current price instead of quoting one that could be outdated. Just tap "Check Price on Amazon."
The bottom line
Cleaner water is one of the easiest wins in a non-toxic home. If you rent or want simple, start with a high-performance pitcher; if you own and want the best, a countertop RO or whole-house system is worth the investment. Match the filter to what's actually in your water, and you'll taste (and feel) the difference.