The tap water here tastes awful. What's the best water filtration system for a home? A whole-house filter or an under-sink one?

If the main problem is awful-tasting tap water, I’d generally choose an under-sink filter, not a whole-house system.

My recommendation

Start with a quality under-sink carbon filter. It gives you excellent drinking/cooking water without the cost, plumbing work, and maintenance of filtering every gallon used by your toilets, showers, washing machine, etc. The CDC specifically recommends point-of-use systems such as under-sink filters when you primarily want to treat water you drink and cook with.

For your situation, I'd look for:

• NSF/ANSI 42 — chlorine, taste and odor. This is probably the most important certification if the water simply tastes bad.
• NSF/ANSI 53 — lead and other health-related contaminants.
• NSF/ANSI 401 — certain emerging contaminants.
• If you're particularly concerned about PFAS, look for an explicit PFAS/PFOA/PFOS reduction claim and certification, rather than assuming a generic "carbon filter" handles it.

A good current option

• Aquasana Claryum 3-Stage Max Flow - $199.99 (The Home Depot)
• Aquasana Claryum 2-Stage - $124.99 (Walmart - Aquasana)
• iSpring 6-Stage Under-Sink RO - $249.99 (The Home Depot)
• Hydroviv Under-Sink Filter - $266.65 (Hydroviv)

For good taste + broad contaminant reduction without going full reverse-osmosis, I'd lean toward the Aquasana Claryum 3-Stage. It is currently around $200 and is certified by WQA for broad contaminant reduction.

If you want maximum purification—particularly if your water report shows PFAS, fluoride, high TDS, or multiple contaminants—I'd step up to under-sink reverse osmosis (RO). NSF identifies NSF/ANSI 58 as the relevant RO standard.

When I'd choose whole-house

A whole-house system makes more sense if you have problems throughout the house, such as:

• Strong chlorine smell when showering
• Sediment/rust coming from multiple faucets
• Well-water issues
• Iron, sulfur, or other problems affecting laundry/plumbing
• You specifically want filtered water from every tap

Whole-house filters can improve taste, chlorine, sediment, etc., but they're generally unnecessary if your complaint is simply "the kitchen water tastes terrible." Consumer Reports similarly recommends under-sink filtration for drinking/cooking and reserves whole-house systems more for sediment and broader household water problems.

One important step before buying: get your local water-quality report. Taste alone can't tell you whether the water contains something you actually need to remove. The CDC and NSF both recommend identifying what's in your water and then matching the filter's specific certified claims to it.

If you tell me whether you're on city water or a well, your approximate home age, and what the taste is like (chlorine, metallic, earthy, sulfur/rotten-egg, etc.), I can narrow it down to the best 2–3 systems for your particular water and what I'd spend on each.

When tap water tastes awful, deciding between a whole-house and an under-sink system comes down to a simple question: Do you want to fix the taste of your drinking water, or do you want to treat every drop of water entering your home (including showers, laundry, and toilets)?

For an "awful taste" (usually caused by chlorine, chloramines, sulfur, or sediment), an under-sink system is almost always the best, most cost-effective choice for drinking and cooking. However, each system serves a distinct purpose.

Under-Sink Filtration Systems

Best for: Fixing taste, removing heavy contaminants specifically for drinking and cooking.

• How it works: Installed directly under your kitchen sink, typically feeding a dedicated faucet or your main cold-water line. Options range from standard multi-stage carbon filters to advanced Reverse Osmosis (RO) systems.
• Why it wins on taste: An under-sink Reverse Osmosis or high-end carbon block filter removes up to 99% of total dissolved solids (TDS), chlorine, lead, fluoride, and bad-tasting minerals. It delivers bottled-quality water right where you need it.
• Pros:
  • Highly effective at polishing taste and removing stubborn contaminants (like PFAS, heavy metals, and chlorine).
  • Lower upfront cost ($150 to $500).
  • Easy to DIY or install with basic plumbing skills.[1]
• Cons: Only filters water at a single tap (usually the kitchen sink).

Whole-House Filtration Systems (Point-of-Entry)

Best for: Protecting plumbing, appliances, and skin/hair from harsh chemicals.

• How it works: Installed where the main water line enters your house. It treats every single drop of water before it flows to your showers, washing machine, and sinks.
• Why it’s usually overkill for just taste: While a whole-house carbon filter or a system like the Aquasana Rhino Whole House System Go to product viewer dialog for this item. is fantastic for reducing chlorine vapors in the shower and preventing scale buildup, it won't purify drinking water to the crisp, pristine standard of an under-sink RO system.[1][2]
• Pros:
  • Every tap in the house gets filtered water (great for soft skin/hair in the shower).
  • Extends the lifespan of water-using appliances (water heaters, washing machines).[1][2]
• Cons:
  • Expensive ($1,000 to $4,000+ including professional installation).
  • Filter changes can be a major chore.
  • Doesn't filter out fine dissolved solids as aggressively at the glass as a dedicated kitchen RO system.

The Verdict

• Go with an under-sink system (like an APEC Under-Sink System Go to product viewer dialog for this item. or a multi-stage Waterdrop Under-Sink Filter Go to product viewer dialog for this item. ) if your main goal is getting rid of that nasty taste in your drinking water without breaking the bank.
• Go with a whole-house system only if your water test shows severe hard water, iron, heavy sediment, or a terrible sulfur smell that makes showering unpleasant.

If you want to narrow this down, let me know:

• Is your water from a city municipal supply or a private well?
• Do you notice any other issues like white scale buildup on faucets or a rotten egg smell?

I can help you pinpoint the exact type of filter you need.

If the main problem is “the tap water tastes awful,” I’d usually choose an under-sink system rather than a whole-house filter.

My recommendation

Best overall for drinking/cooking: under-sink reverse osmosis (RO).

An under-sink RO system treats only the water you actually drink and cook with, while a whole-house system treats every gallon entering the home. EPA specifically notes that point-of-use systems are often more practical than treating the entire household supply.

| Under-sink RO | Whole-house --- | --- | --- Taste/odor | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐ Drinking-water purification | ⭐⭐⭐⭐⭐ | ⭐⭐⭐ Shower/bath water | No | Yes Cost | Usually lower | Usually higher Installation | Easier | More involved Best for | Drinking & cooking | Whole-home water quality

I'd go whole-house if you also dislike the water in the shower, have strong chlorine/chloramine odor throughout the house, have sediment/scale problems, or have a specific contaminant that needs treatment at every faucet.

One important caveat: don't buy a filter based simply on the number of "stages." First identify what's actually in your water and choose a system certified for those contaminants. EPA recommends looking for appropriate NSF/ANSI certification and independently verified contaminant-reduction claims.

If you want really good-tasting drinking water

I'd look at a 5–6 stage under-sink RO with carbon prefilters, preferably NSF/ANSI 58 certified. RO can address things ordinary carbon filters don't, including dissolved minerals and various contaminants.

A couple of current options worth considering:

• APEC RO-90 5-Stage Under-Sink RO - $232.99 (The Home Depot)
• iSpring RCC7AK 6-Stage RO - $249.99 (The Home Depot)
• Waterdrop G3P600 Tankless RO - $456.99 (The Home Depot)
• iSpring WGB32B-PFKDS Whole-House Filter - $899.99 (The Home Depot)

One thing to know about RO: it produces wastewater. EPA says conventional systems can send roughly 5 gallons down the drain for every gallon produced, although WaterSense-labeled systems are limited to 2.3 gallons or less per gallon of treated water.

If you tell me whether you're on city water or a well—and what specifically tastes bad (chlorine, sulfur/rotten egg, metallic, salty, etc.)—I can narrow this down to the type of system I'd actually buy for your house and give you 2–3 specific models.

Choosing between a whole-house and an under-sink water filter comes down to a simple question: Do you want to fix the taste of your drinking water, or do you have a problem affecting every drop of water entering your home?

Since your main complaint is that the tap water tastes awful (usually caused by chlorine, chloramines, sulfur, or sediment), an under-sink system is usually the winner for pure taste and value. However, both have distinct jobs.

Under-Sink Filters (Point-of-Use)

Best for: Drinking, cooking, and targeting terrible taste/odor.

Under-sink systems (like a multi-stage carbon block filter or a Reverse Osmosis system) treat the water right at the single faucet where you get your drinking water.

• Pros:
  • Superior taste removal: They can use Reverse Osmosis (RO) or advanced carbon filters that strip out 99% of bad tastes, odors, heavy metals (like lead), and chemicals.
  • Cost-effective: Much cheaper to buy and install than a whole-house system.
  • Water efficiency: Only the water you actually drink/cook with is filtered.
• Cons:
  • Only treats one faucet (usually the kitchen sink). Your shower water and bathroom sinks remain unfiltered.

Whole-House Filters (Point-of-Entry)

Best for: Protecting plumbing, major aesthetic issues (heavy iron/rust), or heavy chlorine smell in showers.

Whole-house systems hook up directly to your main water supply line where it enters the house, filtering every tap, shower, and appliance.

• Pros:
  • Every drop of water in your home is treated—no more dry, chlorine-smelling showers or hard-water buildup on fixtures.
  • Protects washing machines, water heaters, and internal plumbing from sediment and scale.
• Cons:
  • Doesn't always fix the drinking taste best: Standard whole-house carbon filters are great for general chlorine reduction, but if you want crisp, bottled-quality drinking water, you still might want a dedicated under-sink filter downstream.
  • Expensive & complex: High upfront cost and usually requires a professional plumber to install.

The Verdict: Which should you choose?

• Go with an Under-Sink Filter if: Your main goal is getting rid of a foul taste or weird chemical flavor in your drinking and cooking water . An under-sink Reverse Osmosis system (such as top-rated tankless options like the Waterdrop X12 Alkaline RO System Go to product viewer dialog for this item. ) gives you ultra-pure, great-tasting water on demand. [1][2]
• Go with a Whole-House Filter if: Your water smells like sulfur/rotten eggs all over the house, stains your laundry/tubs with iron, or you want filtered water for every single shower and bath.

To help narrow down the exact fix, tell me:

• Do you know if your water comes from a city municipal supply or a private well?
• Does the water just taste bad , or does it also smell, leave stains, or look cloudy?

Short answer: for most homes with bad-tasting tap water, an under-sink filter is the better first purchase. A whole-house filter is worthwhile when the problem affects all your water (showers, laundry, appliances), not just the taste of your drinking water.

Here’s how I’d choose:

Consumer Reports Complete Water Guide## Under-sink: usually the best value

A good under-sink system treats only the water you actually drink and cook with, which lets it use more aggressive filtration without the huge cost of filtering every gallon used for toilets, showers, and laundry.

Good options:

• Activated carbon block: best for chlorine taste, odors, and many organic compounds.
• Reverse osmosis (RO): best if you’re concerned about dissolved contaminants such as lead, nitrates, arsenic, or PFAS—assuming the specific unit is certified for those reductions.

For a typical city home where the water is safe but tastes unpleasant, I’d start here.

Whole-house: when it makes sense

A whole-house filter goes on your main water line and treats every faucet and shower. It’s great for:

• chlorine smell throughout the house
• sediment/rust particles
• protecting fixtures and appliances
• improving shower water feel

But many whole-house carbon filters do not provide the same level of drinking-water purification as a dedicated under-sink RO system.

My default recommendation

For a homeowner with “awful-tasting” tap water:

1. Get a water test or check your municipal water report first. Different problems need different filters.
2. Install a certified under-sink carbon filter if it’s mainly taste/odor.
3. Upgrade to under-sink RO if you want maximum contaminant reduction.
4. Add a whole-house carbon filter only if you also dislike your shower water or have broader water-quality issues.

A couple questions would narrow this down a lot:

• Are you on city water or a private well?
• What’s the bad taste like (chlorine, metallic, sulfur/rotten egg, salty, musty)?
• Are you in the Boston area (or another city/town)? The local water source changes what’s worth filtering.

When your tap water tastes awful, choosing between a whole-house (point-of-entry) system and an under-sink (point-of-use) system comes down to whether you want to treat every drop entering your home or just the water you actually drink and cook with.

Here is how they stack up to help you decide which is best for your situation:

Under-Sink Filtration Systems

Best for targeting drinking water, cooking water, and ice makers.

• How it works: Installed directly under a specific sink (usually the kitchen), filtering water right before it comes out of a dedicated faucet.
• Top Technologies:
  • Reverse Osmosis (RO): The gold standard for taste. It strips out 90%–99% of dissolved solids, heavy metals (like lead), chlorine, and bad tastes/odors.
  • Carbon Block Filters: Great at removing chlorine, chloramines, and organic compounds that cause bad tastes/smells, while leaving beneficial minerals behind.
• Pros: Highly effective at improving taste and drinking quality; relatively affordable; easy DIY installation; wastes less water (unless it's an RO system, which does produce some wastewater).
• Cons: Only filters one faucet (though you can run a line to your fridge); doesn't protect appliances or shower water from hard water or sediment.

Whole-House Filtration Systems

Best for protecting your plumbing, appliances, and improving water feel everywhere.

• How it works: Installed at the main water line where it enters your house, treating all water before it reaches any faucet, shower, or appliance.
• Top Technologies: Sediment pre-filters combined with catalytic carbon tanks or water softeners.
• Pros: Every tap in the house delivers filtered water; improves shower water quality (better for skin/hair); prevents scale buildup in water heaters and washing machines.
• Cons: Usually more expensive to purchase and install (often requires a professional plumber); doesn't always purify drinking water to the high-purity standard of a reverse osmosis under-sink system (you may still want an under-sink RO for drinking).

The Verdict: Which is "Best"?

• Choose an under-sink system (like a Reverse Osmosis or high-end carbon filter) if: Your main complaint is strictly the taste and drinking quality of your water, and you are on a budget.
• Choose a whole-house system if: Your water smells foul in the shower, leaves hard water stains, stains your laundry, or you want total protection for your home's plumbing.
• The Hybrid Approach: Many homeowners install a whole-house sediment/carbon filter to handle the heavy lifting and protect appliances, paired with an under-sink Reverse Osmosis system in the kitchen for pristine-tasting drinking water.

If you want, tell me:

• What does the water taste or smell like (e.g., rotten eggs, chlorine, metallic, earthy)?
• Do you have hard water scale on your fixtures?

I can recommend the exact type of filter you need to fix your specific taste issue.

Choosing between a whole-house (point-of-entry) and an under-sink (point-of-use) filtration system depends entirely on what is making your water taste awful and what your goals are.

Here is how they stack up to help you decide:

• Whole-House Filter (Point-of-Entry)
  • How it works: Installs right where the main water line enters your house. It treats every drop of water coming from every faucet, shower, and appliance.
  • Best for: Heavy sediment, high chlorine/chloramines, rust, sulfur/rotten egg smell, or hard water issues affecting your whole plumbing system and skin/hair.
  • The downside: It usually doesn't improve the drinking taste as finely as a dedicated under-sink system (unless you add an expensive multi-stage carbon block or UV system), and it's more expensive to buy and install.[1][2][3][4][5]
• Under-Sink Filter (Point-of-Use)
  • How it works: Installs under a single sink (usually the kitchen) and provides a dedicated faucet for drinking and cooking water.
  • Best for: Targeted removal of bad tastes, odors, heavy metals like lead, PFAS, and fluoride using advanced carbon block or Reverse Osmosis (RO) technology.
  • The downside: It only treats water at that one location. Your shower and bathroom sink water remain unfiltered.[1][2][3][4][5]

Which is "best" for awful-tasting water?

If your main complaint is the drinking taste , an under-sink Reverse Osmosis system is almost always the winner. It strips out 90%–99% of dissolved solids, chlorine, and taste-ruining contaminants far more thoroughly than a whole-house system.[1][2][3][4][5]

However, if the bad taste is accompanied by a foul odor (like sulfur) throughout the house or visible discoloration/sediment in your bath water, a whole-house system is the necessary first step. Many homeowners actually use a combination : a whole-house sediment/carbon filter to protect the plumbing and shower water, paired with an under-sink RO system in the kitchen for pristine drinking water.[1][2][3][4][5]

To help narrow down the ideal setup , tell me:

• What does the water taste or smell like (e.g., chlorine, metallic, sulfur, dirt)?
• Do you have city water or well water?

I can recommend the specific type of filtration media or system you need.

If the main problem is “the tap water tastes awful,” I’d start with an under-sink filter, not a whole-house system.

Under-sink vs. whole-house

| Under-sink | Whole-house --- | --- | --- Best for | Drinking/cooking water | Every faucet/shower Taste improvement | Excellent | Good–excellent Removes specific drinking-water contaminants | Usually better | Depends heavily on system Installation | Relatively easy | More involved/plumber often needed Cost | ~$100–$400 | ~$400–$2,000+ Filter replacement | Simple | More expensive/involved Water waste | None for standard carbon; RO produces some | Usually none My pick for your situation | 🏆 Yes | Only if you need whole-home treatment

NSF specifically distinguishes point-of-use systems such as under-sink filters from point-of-entry whole-house systems. For taste and odor, look for NSF/ANSI 42; for health-related contaminants such as lead, look for NSF/ANSI 53; and some emerging contaminants are covered by NSF/ANSI 401. Importantly, certification applies to specific contaminant claims, not automatically to everything a filter encounters.

What I'd buy

If you want great-tasting water without going overboard, I'd look at a good 2–3 stage under-sink carbon system.

• Aquasana Claryum 3-Stage Max Flow Under-Sink Filter - $199.99 (The Home Depot)

This is a particularly sensible middle ground: it is currently around $200, has a dedicated drinking-water faucet, and the manufacturer says it reduces a broad range of contaminants while improving taste.

If you're concerned about PFAS, fluoride, nitrate, arsenic, or a broad range of dissolved contaminants, I'd step up to reverse osmosis (RO) rather than simply buying a more elaborate carbon filter. NSF identifies NSF/ANSI 58 as the relevant RO standard.

• iSpring 6-Stage Under-Sink Reverse Osmosis System - $212.50 (The Home Depot)

When I'd choose whole-house

I'd go whole-house if you also notice:

• Bad-smelling/tasting water at every faucet
• Chlorine/chloramine odor in showers
• Sediment, rust, or discoloration
• Hard-water problems
• A desire to filter shower/bath water as well as drinking water

A whole-house system can address those issues, but it's important not to assume that a $500–$1,000 “whole-house filter” removes the same things as a high-quality drinking-water filter. NSF recommends starting with your water-quality report/testing and then matching the system's certified contaminant claims to what's actually in your water.

• iSpring WGB32B-PF Whole-House Filter - $599.99 (The Home Depot)

My recommendation: If you're primarily trying to make the water you drink and cook with taste good, spend ~$150–$300 on a quality under-sink system first. You can always add whole-house treatment later if you discover a broader water-quality problem.

If you tell me whether you're on city water or a well, what specifically tastes bad (chlorine, metallic, sulfur/rotten-egg, salty, etc.), and roughly your budget, I can narrow it down to the best 2–3 systems for your situation.

Choosing between a whole-house (point-of-entry) and an under-sink (point-of-use) filtration system depends entirely on what is making your water taste awful and where you need clean water.

Here is how they compare to help you decide which is best for your home:

Whole-House Filtration System

• Best for: Treating all water entering the house (showers, laundry, sinks, and appliances).
• How it works: Connects directly to your main water supply line right where it enters the house.
• Pros:
  • Protects plumbing and appliances from scale, sediment, and buildup.
  • Provides filtered water out of every single tap and shower in the home.
  • Eliminates chlorine smells and hard water throughout the house.
• Cons:
  • Expensive upfront equipment and installation costs (often requires a professional plumber).
  • Doesn't typically provide ultra-fine drinking water purification (like removing heavy metals or high levels of total dissolved solids) unless paired with a secondary system.
  • Wastes water or requires heavy maintenance depending on the media (e.g., salt-based softeners or large carbon tanks).

Under-Sink Filtration System

• Best for: High-purity, great-tasting drinking and cooking water at a specific location.
• How it works: Installs in the cabinet under a single sink (usually the kitchen) and routes to a dedicated secondary faucet or your main tap.
• Pros:
  • Highly effective at improving taste—especially Reverse Osmosis (RO) or advanced carbon block systems that strip out bad tastes, odors, lead, and PFAS.
  • Much cheaper and easier to install (often a DIY project).
  • Low maintenance with easy, infrequent filter changes.
  • Doesn't waste water (unless it's an RO system, which wastes some water during the purification process).
• Cons:
  • Only filters water at that specific sink; bathroom taps and showers remain unfiltered.
  • Does not protect your washing machine, water heater, or showers from hard water or sediment.

Which should you choose?

• Choose an under-sink system if your primary goal is fixing the taste and odor of your drinking/cooking water while keeping costs low.
• Choose a whole-house system if your water has heavy sediment, strong sulfur/chlorine odors in the shower, or is very hard/corrosive and threatening your home's plumbing.
• Pro tip: Many homeowners do a hybrid approach—a whole-house sediment/carbon filter to protect the plumbing and shower water, paired with an under-sink Reverse Osmosis system in the kitchen for pristine drinking water.

To help narrow down the best system for you, tell me:

• What does the water taste or smell like (e.g., metallic, sulfur/rotten egg, chlorine, or dirt)?
• Do you have city water or a private well?

If the main problem is bad-tasting tap water, I’d generally choose an under-sink filter over a whole-house system.

Under-sink vs. whole-house

| Under-sink | Whole-house --- | --- | --- Best for | Drinking & cooking | Treating every faucet/shower Taste improvement | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐ Contaminant removal | Often excellent | Depends heavily on system Cost | Usually $100–$500 | Often $400–$2,000+ Installation | Relatively easy | More involved Filter replacement | Cheap/easy | Can be more expensive Wastes water | Only RO systems | Usually no My pick for your situation | Yes | Only if you need whole-home treatment

NSF specifically recommends starting with your water-quality report/testing and then choosing a filter certified for the specific contaminants you want reduced. NSF/ANSI 42 is primarily for things like chlorine, taste and odor; NSF/ANSI 53 covers specific health-related contaminants; and NSF/ANSI 58 applies to reverse-osmosis systems.

What I'd buy

If your water is safe but tastes like chlorine, chemicals, or generally "municipal," I'd get a high-quality carbon under-sink filter. That's usually the sweet spot: dramatically better taste without the complexity of RO.

A particularly attractive option from the current products I found is:

• Aquasana Claryum 3-Stage Max Flow Under-Sink Filter - $199.99 (The Home Depot)

It's WQA-certified and designed to reduce chlorine, lead, PFAS and other contaminants while retaining minerals, with filters rated for about 800 gallons/6 months.

If you want maximum contaminant reduction, especially if you're concerned about things such as fluoride, nitrate, arsenic or high dissolved solids, I'd step up to reverse osmosis. NSF/ANSI 58 specifically covers RO performance and includes claims for contaminants such as lead, arsenic, nitrate/nitrite, fluoride, chromium and PFAS.

• iSpring 6-Stage Under-Sink Reverse Osmosis System - $212.50 (The Home Depot)

When I'd choose whole-house

Go whole-house if you want every tap, shower, bathtub and appliance to receive treated water—for example, if you dislike the smell while showering, have sediment throughout the plumbing, or have a well with multiple water-quality problems. Whole-house systems treat water as it enters the home, whereas under-sink systems target drinking/cooking water.

One important caveat: don't buy based on "10-stage," "99% filtered," or similar marketing. The key is the specific NSF/WQA certification and contaminant claim. A filter certified for chlorine isn't necessarily certified for lead, PFAS, nitrate, etc.

If you tell me whether you're on municipal water or a private well, and what exactly tastes bad (chlorine, sulfur/rotten egg, metallic, salty, musty, etc.), I can narrow it down to the best type—and a few specific systems worth buying.