Best Water-Filter Brands for Home Use, Sorted by Filter Type

Households whose main complaint is chlorine taste, and who want a separate drinking tap, are best matched with an under-sink carbon filter such as the Viomi Under-Sink Carbon Filter. Homes that want dissolved solids reduced in drinking and cooking water fit an under-sink reverse osmosis (RO) system such as the Viomi M1, a tankless 1000 GPD system that adds minerals back after the RO stage, or the iSpring RCC7 and Aquasana SmartFlow RO. Renters who can't change the plumbing can get certified lead reduction from the Brita Elite and PUR PLUS pitcher cartridges and the PUR PLUS and Brita faucet-mount filters covered here. Chlorine taste at every tap calls for whole-house carbon filtration such as the Aquasana Rhino or SpringWell CF, while scale throughout the house calls for a softener or salt-free conditioner.

The Problem You're Solving Sets the Category

Knowing what is in your water, from your utility's report or a home test, points to the right one of the four categories below.

• Chlorine taste and odor. Many city-water households start here. Activated carbon handles it, and the matching certification is NSF/ANSI 42, the standard for aesthetic effects such as chlorine, taste, and odor.
• A specific health-related contaminant, such as lead. Here the evidence has to name the contaminant, whether it is a certification listing or an independent lab test report. NSF/ANSI 53 covers reduction claims for contaminants with health effects, and NSF/ANSI 58 covers RO systems. Certification under 53 is granted contaminant by contaminant, so the named contaminant matters as much as the standard number. NSF/ANSI 401 covers a set of emerging contaminants, and it's where microplastics claims are listed.
• High dissolved solids, or dissolved contaminants carbon doesn't target. RO pushes water through a semi-permeable membrane, which lets it reduce dissolved substances that carbon alone isn't designed for. According to EPA, reverse osmosis works well at removing chloride and total dissolved solids, along with other inorganic substances. The agency's non-mandatory TDS (total dissolved solids) guideline sits at 500 mg/L, a level chosen for taste and appearance, not health.
• Scale on fixtures and appliances. Hardness affects the whole house, so it calls for a whole-house softener or conditioner rather than a drinking-water filter.

NSF also notes that the numbers in standard names "are not a ranking or rating system." Each standard covers a different type of product and claim.

Where the Filter Can Go Narrows the List

• No changes to the plumbing at all. Pitchers sit in the fridge; faucet-mount filters screw onto the end of a standard kitchen faucet. Both suit renters.
• Under the sink, sharing the main faucet. Direct-connect carbon filters attach to the cold-water line and send filtered water out of your existing faucet. They can also suit renters where the lease allows work on the cold-water line.
• Under the sink with a dedicated drinking faucet. These need one hole in the countertop or sink deck for a small separate tap. The RO systems in this guide and the Viomi Under-Sink Carbon Filter work this way.
• Under the sink with a drain connection. RO systems need a faucet hole and a connection to the drain line. Powered tankless models also need an outlet; many tanked systems run without power but need room for a tank.
• At the main water line. Whole-house systems treat every tap from where water enters the home.

Upkeep Intervals Differ by Category

The CDC counts changing filters regularly, on the manufacturer's schedule, as part of maintenance. For the models in this guide, the maximum or typical intervals are:

• Pitcher cartridges: up to 40 gallons or 2 months for PUR PLUS; 120 gallons for Brita Elite, which Brita equates to about 6 months in most homes; and for ZeroWater, whenever the filtered-water meter shows 006 or above.
• Faucet-mount cartridges: 3 to 4 months (PUR PLUS 100 gallons or 3 months; Brita 100 gallons, about 4 months for most households).
• Under-sink carbon cartridges: 6 to 24 months (Aquasana Claryum Direct Connect up to 6 months; Viomi Under-Sink Carbon Filter up to 12 months; Waterdrop 15UA up to 24 months).
• Under-sink RO: set per stage and per model, from 6 months for some carbon stages to up to 4 years for the Viomi M1's RO cartridge.
• Whole-house: sediment pre-filters every several months, main media often years.

If you know you'll forget, favor a longer interval or a system that reminds you.

Situation-to-Filter Lookup

For a brand-by-brand view across these categories, see our comparison of leading water filter brands by type, and for help matching symptoms to a system, our guide to choosing a filtration system for bad tap water.

Category Picks

Pitchers

Choose by the certified claim on the specific cartridge.

• Brita Elite (model OB06): IAPMO R&T and WQA list it under NSF/ANSI 53 for lead reduction (NSF lists the Pacifica and Tidal pitchers with this cartridge for lead), and WQA certifies it to NSF/ANSI 401 for microplastics. Each cartridge is good for 120 gallons, roughly half a year of use in most households by Brita's estimate.
• PUR PLUS pitcher filter (PPF951K): Its IAPMO R&T certification covers Total PFAS and lead under NSF/ANSI 53, and microplastics under NSF/ANSI 401. Each filter handles up to 40 gallons or 2 months.
• ZeroWater 5-stage filter: IAPMO R&T certifies it under NSF/ANSI 53 for PFOA, PFOS, hexavalent chromium, mercury, and lead, at a certified capacity of 15 gallons. ZeroWater recommends replacing it when the included meter reads 006 on filtered water. That's a TDS-based cue for when to change the cartridge; ZeroWater itself notes the meter isn't meant to measure lead or PFOA/PFOS.

Faucet-Mount Filters

These attach to the end of the faucet and switch between filtered and unfiltered water, without changes to the supply plumbing.

• PUR PLUS faucet filter (RF-9999): IAPMO R&T's certification lists mercury, lead, Total PFAS, and VOCs under NSF/ANSI 53, plus microplastics under NSF/ANSI 401. One cartridge covers up to 100 gallons or 3 months.
• Brita faucet system (FF-100) with FR-200 filters: WQA certification spans NSF/ANSI 42, 53, and 401, and the listed claims include lead and microplastics. Brita puts each filter at 100 gallons, about 4 months for most households, and a built-in indicator signals when to replace it.

Both thread onto the end of a standard faucet, so make sure your spout accepts an adapter before buying.

Under-Sink Carbon Filters

Under-sink carbon systems keep the counter clear. The main split is whether filtered water comes out of your existing faucet or out of its own tap.

• Aquasana Claryum Direct Connect (AQ-MF-1): Connects to your existing faucet. IAPMO R&T lists it under NSF/ANSI 42 (including chloramine), NSF/ANSI 53 (including lead and PFOA/PFOS), and NSF/ANSI 401 (including microplastics). Rated for 784 gallons or up to 6 months, at 10 to 125 psi.
• Waterdrop 15UA: Also connects to the original faucet and runs without electricity. IAPMO R&T lists it under NSF/ANSI 42 for chlorine, taste, and odor. Waterdrop rates it for up to 24 months and notes it isn't designed for significant TDS removal, so dissolved minerals stay in the water.

Viomi Under-Sink Carbon Filter is built for kitchens that want a dedicated drinking-water tap while keeping the main faucet exactly as it is.

It suits homeowners on municipal water whose main complaint is chlorine taste and odor, and who'd like a separate tap for drinking and cooking water so the main faucet stays unfiltered for dishes. Inside is one 2-in-1 cartridge pairing PP cotton with a carbon rod at 0.5-micron precision, which Viomi built to go after chlorine along with unpleasant tastes and odors. Intertek has authorized this model to carry the NSF/ANSI/CAN 372 mark for lead-free materials in contact with drinking water.

Setup stays simple: the dedicated faucet comes in the box, the system connects to the cold-water supply through the included three-way ball valve, and it needs one faucet hole but no electricity and no drain connection. Upkeep is one cartridge on a calendar of up to 12 months on municipal water, and Viomi's twist-and-lock design lets you replace it in 3 seconds without tools. Leave at least 60 mm of clearance below the filter so there's room for the change.

If reducing dissolved solids is also a priority, the next category is the better fit.

Under-Sink Reverse Osmosis

RO makes sense when reducing dissolved solids is a goal, or when your water report names dissolved contaminants that a specific RO model is certified or tested to address.

• Viomi M1: A tankless, 9-stage, 1000 GPD system that makes water on demand instead of storing it, then adds selected minerals back after the RO stage. Its purified TDS therefore reads higher than plain RO water by design, because of the minerals added back. At a 3:1 pure-to-drain ratio it produces 3 cups of purified water for every 1 cup sent to the drain. The touchscreen smart faucet shows filter life and TDS readings, and the Viomi app tracks water use and sends filter replacement reminders. Its product page publishes independent SGS testing for lead reduction (>99.87%), and SGS has performance-tested it for PFOS/PFOA reduction. Installation fits a standard kitchen, with step-by-step videos from Viomi: a dedicated, always-on outlet on a GFCI-protected circuit, not the garbage disposer's switched one; a 1 to 1.5 inch hole for the smart faucet through the counter or sink; and a 1/4-inch drain-pipe hole.
• iSpring RCC7: A traditional five-stage tanked system with a 3.2-gallon storage tank and no power requirement. NSF lists the RCC7 under NSF/ANSI 58 for TDS reduction. Its pre-filters are standard 10-inch cartridges.
• Aquasana SmartFlow Reverse Osmosis (AQ-SFRO2): A tanked, four-stage system with a remineralizer as its last stage. WQA lists it under NSF/ANSI 58 (claims include fluoride, nitrate, and TDS), NSF/ANSI 53 (including lead, PFOA, and PFOS), NSF/ANSI 42, and NSF/ANSI 401.

Tanked systems hold a reserve of filtered water, and many run without power; tankless systems free up cabinet space and make water on demand.

Whole-House Systems

A whole-house system is the only category that changes the water at the shower, washing machine, and every other tap.

• Aquasana Rhino (WH-1000): A two-tank system using activated carbon and copper-zinc (KDF) media, independently tested to NSF/ANSI 42 for chlorine reduction and rated for 1,000,000 gallons or 10 years. Its tanks are certified to NSF/ANSI/CAN 61.
• SpringWell CF: A whole-house filter for city water combining KDF, catalytic carbon, and sediment filtration. SpringWell lists a pre-filter change every 6 to 9 months.
• For hardness: A salt-based softener, such as SpringWell's SS series, removes calcium and magnesium and needs salt refills and a drain line. A salt-free conditioner, such as SpringWell FutureSoft, reduces scale buildup without salt but, in SpringWell's words, "won't make water feel slick or stop spotting the way salt does." Some Culligan and Kinetico dealers advertise free water tests before recommending a system.

A whole-house carbon system addresses the chlorine-type taste issues its claims cover at every tap. If a drinking-water concern falls outside those claims, choose additional treatment for that specific contaminant.

FAQ

What's the best water filter for renters?

Pitchers and faucet-mount filters need no plumbing changes, and both are available with certified lead reduction (the Brita Elite and PUR PLUS pitcher filters; the PUR PLUS and Brita faucet filters). Direct-connect under-sink filters such as the Aquasana Claryum Direct Connect attach to the existing cold-water line without drilling, which some leases allow. Anything that needs a new faucet hole or a drain connection usually needs the landlord's approval.

Can one filter solve every water problem in the house?

Rarely. A drinking-water filter at the kitchen sink doesn't touch the water in the shower or the dishwasher, and a whole-house carbon filter doesn't provide the reduction an under-sink RO system does. For a separate drinking-water concern, a point-of-use filter can sit alongside whole-house treatment for chlorine or hardness.

How do I use my water report to pick a category?

Follow the five steps in the final section of this guide. For lead, add a home tap test, because it depends on the plumbing in your building.

What does a whole-house carbon filter cover?

Its claims center on chlorine-type taste and odor at every tap, including the shower and washing machine. The Aquasana Rhino is independently tested to NSF/ANSI 42 for chlorine reduction, and the SpringWell CF combines KDF, catalytic carbon, and sediment filtration for city water. A drinking-water goal outside those claims is handled at the kitchen sink by a filter whose certification or test evidence names that contaminant.

Using Your Water Quality Report to Narrow the List

Your water utility publishes an annual water quality report, often called a Consumer Confidence Report. It can rule out whole categories quickly.

1. Find your water system's report. Utilities usually post it on their website.
2. List what was detected. Look at the columns for detected levels and the regulatory limit. Note anything close to a limit, plus disinfectant type (chlorine or chloramine) and hardness if listed.
3. Separate building issues from supply issues. The CDC names lead pipes as the most common source of lead in tap water, so a citywide report can't tell you what's in your own tap. A home test fills that gap.
4. Match the concern to a category. Taste and odor point toward carbon; a specific contaminant such as lead points toward a filter whose certification or lab test names it; high TDS points toward RO; hardness points toward whole-house treatment.
5. Shortlist by model-level claims. Compare the certification or test evidence named for the specific model and cartridge, which is the level a claim has to match.

Private well owners don't get a utility report, so a lab test of the well is the starting point.