Best Water Filters of 2026
After 90 days testing 14 filters in a Cincinnati home with Tap Score lab verification at midpoint, the Waterdrop G3P800 tankless RO scores highest at 9.5/10 ($649; IAPMO lists it for lead, fluoride, PFOA and PFOS). The Aquasana AQ-5300+ under-sink filter follows at 9.3/10 and $149, listed by WQA for lead and PFOA/PFOS, with 99.1% lead removal and 95.4% PFAS reduction in our testing.
Our Top Pick
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Editor's Top Pick
Waterdrop G3P800 Tankless RO
9.5
/10
The Waterdrop G3P800 is our top tankless RO pick. 800 gallons per day capacity with a 3:1 efficiency ratio and smart filter life monitoring. Under $650 installed DIY.
$649+ $120/yr filters
Pros
- 800 GPD capacity — near-instant delivery
- 3:1 pure-to-waste ratio (efficient)
- No tank (no bacteria growth)
- Smart filter monitoring app
Cons
- Wastes some water (3:1 ratio)
- Annual filter cost ~$120
- Professional install recommended
NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 372
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