Best water filter

The best water filter to buy depends on what you want to remove from your water, how much you want to spend, and whether you want a pitcher, an under-sink system, or a whole-house filter.

My biggest recommendation: choose a filter certified for the specific contaminants you care about, rather than one that simply claims to “purify” water. For example, reducing chlorine taste is very different from reducing lead, PFAS (“forever chemicals”), or arsenic.

The best water filters to consider

1. Best overall for most homeowners

Aquasana Claryum 3-Stage Max Flow

Typical budget: $200–$300

A strong choice for everyday drinking and cooking water. It retains beneficial minerals and has certified reduction claims for lead and PFOA/PFOS, among other contaminants. Water Filter Guide Good Housekeeping

Best if you want an under-sink filter without the wastewater associated with reverse osmosis.

Aquasana Claryum 3-Stage Max Flow AQ-6300M

2. Best for more comprehensive filtration

AquaTru Classic

Typical budget: $300–$500

Countertop reverse osmosis is worth considering if you want broader contaminant reduction, including lead, arsenic, fluoride and certain PFAS, subject to the exact model's certifications. No plumbing installation is needed. Drinking Water Filter Home Water Report

Trade-off: it takes counter space, needs electricity and produces wastewater.

3. Best budget option

PUR PLUS 11 Cup Water Pitcher with Lead Reducing Filter, W 9…

Around $30–$45

An easy, affordable refrigerator pitcher with a certified lead-reduction claim and improvements to taste and odor. No installation required. Home Water Report walmart.com

Best for renters and anyone who doesn't want to spend hundreds of dollars.

Check price at Walmart

4. Best premium under-sink reverse osmosis

Waterdrop G3P600 Reverse Osmosis System, 600 GPD, NSF/ANSI 4…

Around $450–$600

A compact, tankless design for households that drink a lot of filtered water. Its listed NSF/ANSI 58 certification covers total dissolved solids reduction, but that alone does not establish removal of every health-related contaminant. Check the exact model's claims before buying. homedepot.com TapBuff

Check price at Home Depot

What to check before buying

• Lead: Look for NSF/ANSI 53 or NSF/ANSI 58 certification specifically for lead reduction.
• PFAS: Verify a specific PFOA/PFOS reduction claim under the applicable certification standard.
• Taste and chlorine: A basic carbon filter may be all you need.
• Well water: Test the water first; bacteria, nitrates and arsenic can require very different treatment.
• Ongoing costs: Compare replacement-filter prices and how often they need changing, not just the purchase price. The EPA recommends verifying the exact contaminant claims with the certifier. US EPA Home Water Report

Let me narrow it down to the best one for you

1. Where do you want the filter?

Pitcher that goes in the fridge

Countertop system, no installation

Under-sink filter

Whole-house filtration

Whatever works best

2. What's your budget?

Under $50

$50–$100

$100–$300

$300+

3. What's most important to you?

Better taste and less chlorine

Reducing lead and PFAS

Removing as many contaminants as practical

Hard water, scale and mineral buildup

General peace of mind

4. What's your water source?

City tap water

Private well

Bottled or other

Not sure

[Find my best filter]

The best water filter depends on your installation needs and what you need to remove from your water supply: cleanwaterpicks.com

1. Best Under-Sink Reverse Osmosis System: iSpring RCC7AK (6-Stage with Alkaline Remineralization)

Price: Around $211.49 – $239.99 (available via Home Depot or iSpring Filter)

Best For: Maximum contaminant reduction and balanced mineral taste.

Why it’s great: Certified to NSF/ANSI 58, it removes over 1,000 contaminants (including lead, arsenic, fluoride, and PFAS). The 6th stage adds an alkaline remineralization filter that restores healthy calcium and magnesium while balancing pH for a natural taste.

Alternative (5-stage without remineralization): iSpring RCC7 5-Stage Reverse Osmosis System, priced around $197.99 at Home Depot.

2. Best Pitcher Filter: ZeroWater 10-Cup / 23-Cup 5-Stage Dispenser

Best For: Apartments, renters, or people wanting clean water without permanent plumbing. YouTube

Why it’s great: Uses a gravity-fed 5-stage filter certified to reduce lead, chromium, PFOA, and PFOS. It strips out virtually all total dissolved solids (TDS) and includes a digital TDS meter to test your water. YouTube

Downside: Filter cartridges have a shorter lifespan (around 40 gallons) and require more frequent replacement than under-sink systems. YouTube

3. Best Whole-House Filter: Waterdrop WD-WHF21-PG or iSpring WGB32BM

Best For: Treating all water entering your home (showers, laundry, and sinks).

Why it’s great: The Waterdrop 1-inch whole-house system ($100–$150) improves chlorine taste and odor on standard plumbing, while the 3-stage iSpring WGB32BM ($420–$490) targets heavy sediments, iron, and manganese.

To help narrow down the best option, tell me:

Do you want an under-sink system , a pitcher , or a whole-house setup?

Are you on city water or a private well ?

What specific contaminants (like lead, chlorine, or hard water ) are you most concerned about?

The "best" water filter depends on your budget, living situation (renting vs. owning), and how deeply you want to filter your water. To find the right match, it helps to look at the top choices categorized by type based on expert lab testing and performance ratings:

1. Best Countertop / Reverse Osmosis (No Plumbing Required)

• Top Pick: AquaTru Carafe (or AquaTru Classic)
• Why it’s great: It uses multi-stage reverse osmosis technology without needing any permanent under-sink installation—you just plug it into a counter outlet. CNET It consistently earns top scores in contaminant-reduction testing (wiping out nearly 100% of heavy metals, PFAS, fluoride, and chlorine). Water Filter Guru The Carafe version features a sleek glass container that fits nicely in the fridge.
• Best for: Homeowners or renters who want heavy-duty purification (comparable to a permanent under-sink system) without drilling holes or plumbing.

2. Best Under-Sink System (Permanent & High-Flow)

• Top Pick: Aquasana 3-Stage Max Flow (Claryum)
• Why it’s great: If you want hidden filtration and a dedicated faucet on your sink, this system connects directly to your plumbing. Café Bavaria It boasts a high flow rate (so you aren't waiting forever to fill a glass) and is certified to remove over 70–78 contaminants, including lead, PFAS, chlorine, and herbicides, while still leaving beneficial minerals like calcium and magnesium behind. Good Housekeeping
• Best for: Homeowners who want unlimited, fast-flowing purified water straight from a dedicated tap.

3. Best Pitcher / Gravity Filter (Budget-Friendly & Easy)

• Top Pick: Culligan ZeroWater Pitcher or Brita Everyday Elite Good Housekeeping
• Why it’s great: ZeroWater pitches feature multi-stage ion-exchange filters that score exceptionally high for reducing total dissolved solids and health-related contaminants compared to standard pitchers. If you want something simpler and cheaper for basic chlorine and taste improvement, standard Brita pitchers are a reliable, low-cost baseline. CNET
• Best for: Renters, college students, or anyone on a budget who wants a simple fridge-door solution with zero setup.

4. Best Faucet-Mounted Filter

• Top Pick: Culligan Faucet Mount or Brita Elite Advanced Good Housekeeping
• Why it’s great: These attach directly to your existing kitchen faucet and feature a small switch so you can toggle between filtered water for drinking and unfiltered water for washing dishes. They are inexpensive and easy to install without tools. Good Housekeeping
• Best for: Renters who want quick tap filtration without taking up counter or fridge space.

How to Choose:

• If you are worried about PFAS ("forever chemicals"), lead, or heavy metals: Go with a Reverse Osmosis system (like AquaTru) or a certified Under-Sink filter (like Aquasana).
• If you want cheap and simple: A ZeroWater pitcher or Brita will handle basic taste and odor.

What kind of setup are you looking for (pitcher, countertop, or under-sink), and are there specific contaminants you are most concerned about?

For most people, the PUR PLUS 11-Cup pitcher is a strong pick; independent testing rated it best for most households and found it removed the most contaminants among the pitcher models tested. But the best choice depends on what’s in your tap water—check a local water-quality report, then choose a filter certified to reduce the specific contaminants you’re concerned about.techgearlab.comconsumerreports.org

Look for a filter with a refillable cartridge system and a filtration ratio of at least 10:1. Check the manufacturer's warranty and let them install it at home.