Best water filters for the home: countertop vs under-sink vs whole-house

How the 93/100 was earned.

1. 01

   Best overall93

   AquaTru Countertop RO

   Four-stage reverse osmosis in a countertop unit that plugs into a standard outlet. NSF certified to Standards 42, 53, 58, and 401: the full set that covers aesthetic contaminants, health-related contaminants, RO performance, and emerging compounds like PFOA, PFOS, and BPA. No plumber needed. Filters last six months to two years depending on stage. The tradeoff: you refill a tank, you wait, and it produces wastewater.

   SponsoredCheck AquaTru
2. 02

   Best gravity filter82

   Big Berkey Gravity Filter

   A steel canister with ceramic-composite Black Berkey elements that uses gravity. No electricity, no plumbing. Independent lab reports show strong reduction of lead, chlorine, pathogens, and many VOCs. NSF certification is the weak point: Berkey does not hold NSF 53 on PFAS, and they've had regulatory disputes in California and Iowa. Excellent for off-grid, camping, and power outages. For daily home use with a grid connection, AquaTru's certification story is cleaner.

   SponsoredCheck Berkey
3. 03

   Best budget84

   Epic Pure Pitcher

   A pitcher-format filter with published third-party testing against 200+ contaminants including PFAS, lead, chromium-6, and pharmaceuticals. Made in the US, replaceable cartridges, nothing to install. Slower flow than a Brita and pricier per cartridge, but the contaminant removal is a full tier above any mass-market pitcher. The sensible starting point if $400 for AquaTru isn't in budget this month.

   SponsoredCheck Amazon
4. 04

   Best budget alternative80

   Clearly Filtered Pitcher

   Similar positioning to Epic Pure: published test data, strong PFAS and fluoride reduction, US-made. Cartridges last roughly 100 gallons. We'd flip a coin between Clearly Filtered and Epic Pure; both are honest products with transparent testing. Clearly Filtered's under-sink line is also worth considering if you want pitcher-grade filtration at the tap.

   SponsoredCheck Amazon
5. 05

   Best under-sink RO86

   APEC ROES-50 Under-Sink RO

   A traditional five-stage under-sink reverse osmosis system at roughly half the installed cost of most competitors. NSF-certified components, well-documented install, and filters that are easy to source anywhere. Requires a dedicated faucet hole and storage tank under the sink. If you own your home and want plumbed-in RO, this is the default pick. Renters should stick to countertop.

   SponsoredCheck Amazon
6. 06

   Best premium under-sink83

   Waterdrop G3 Tankless RO

   Tankless RO. Water is filtered on demand instead of sitting in a storage tank. NSF 58 and 372 certified. The premium over APEC buys you a smaller footprint and a TDS display on the faucet. Noisier than a tanked system when filtering. Worth it if your under-sink space is tight; otherwise APEC is the more boring, more repairable choice.

   SponsoredCheck Amazon
7. 07

   Best whole-house78

   Aquasana Rhino Whole-House

   Whole-house carbon and KDF filtration, rated for roughly 1 million gallons (about 10 years for a family of four). Reduces chlorine, chloramines, lead, mercury, and VOCs site-wide, including shower and laundry water. NSF 42 certified. Does not remove fluoride or dissolved solids. For that you still want RO at the kitchen tap. Install requires a plumber and a shutoff.

   SponsoredCheck Amazon
8. 08

   Budget honorable mention70

   Brita Elite Pitcher

   Brita's upgraded cartridge (formerly LongLast) is NSF certified to Standards 42 and 53 for lead, chlorine, and a short list of other contaminants. It's a real filter, not a placebo. The ceiling is low: no PFAS removal, no fluoride removal, no pharmaceutical claims. Fine as a bridge for a few months. Not fine as your permanent solution if you live anywhere with known PFAS contamination.

   

   SponsoredCheck Brita

What people ask us most.

Do I actually need a water filter?

Probably, depending on your zip code. The EPA's 2024 final PFAS rule set enforceable limits at 4 parts per trillion for PFOA and PFOS, and utilities have until 2029 to comply. Until then, EWG's Tap Water Database maps known contaminants in your local system. Look yours up before deciding. If your system shows elevated lead, chromium-6, trihalomethanes, or any PFAS, a filter is the fastest intervention.

Is reverse osmosis worth it?

For PFAS and fluoride specifically, yes. RO is the only consumer-grade technology that reliably removes both. Carbon filters don't touch fluoride and have mixed PFAS performance. RO does strip minerals along with contaminants, which is a real tradeoff, but the idea that demineralized water is harmful in meaningful amounts isn't supported by current evidence. If you want the minerals back, remineralization cartridges or a pinch of sea salt in a gallon jug solves it.

What's the difference between NSF 42, 53, 58, and 401?

NSF 42 covers aesthetic contaminants (chlorine, taste, odor). NSF 53 covers health-related contaminants (lead, cysts, VOCs, chromium-6). NSF 58 is specifically for reverse osmosis performance. NSF 401 covers emerging compounds (BPA, pharmaceutical residues, pesticides). A filter certified to only 42 is not a health filter. Look for 53 at minimum, ideally 53 and 401, and 58 if it's an RO system.

Does Berkey really not have NSF certification?

Correct. Berkey publishes independent lab test reports from labs like Envirotek and NSF-accredited labs, and the results are strong. But the company does not hold full NSF product certification the way AquaTru or APEC do. That's a defensible choice for a small company (NSF certification is expensive), but it's a real gap in the paper trail, and it's the reason Berkey has faced EPA questions in the past.

Will a water filter remove microplastics?

Reverse osmosis and properly-rated carbon block filters remove microplastics above 0.5 microns, per multiple 2020-2023 studies. Nanoplastics, below 100 nanometers, are harder. A 2024 paper in PNAS (Qian et al.) identified nanoplastics in bottled water at up to 240,000 particles per liter; filtered tap water is almost certainly a lower-particle exposure route than bottled.

What about shower filters?

Worth considering if your water is chlorinated or chloraminated. Chlorine and chloramines volatilize in hot water and are inhaled during showers. The exposure route is real, though the health significance is still debated. A simple KDF shower filter reduces the chlorine smell and reduces skin irritation for many people. We'd call it a tier-two upgrade, not a priority over your drinking water.

Related in this hub.

• The Guide

  PFAS 'Forever Chemicals': What They Are and Where They Hide

  Microplastics · A calm, cited guide to what PFAS are, why they persist, where they hide in daily life, and practical ways to reduce your exposure.

  11 min
• The Explainer

  What Are Microplastics? A Plain-English Explainer

  Microplastics · Microplastics are small plastic fragments under 5mm. Here's what they're made of, where they come from, and what the evidence says about human health, calmly.

  8 min
• The Comparison

  Best Non-Toxic Water Bottles of 2026, Tested and Ranked

  Kitchen · We tested stainless steel and glass water bottles for leaching, taste, and durability. Here's the editor's pick, the best glass option, and the one we'd skip.

  14 min
• The Explainer

  Brita vs Berkey vs AquaTru: The Gravity Filter vs Counter Filter Debate

  Kitchen · Brita, Berkey, AquaTru: three filters, three different jobs. Here's the honest comparison with the contaminant data.

  11 min