# What a Faucet Water Filter Costs: Unit and Cartridges

> Faucet filters run $20 - $100 with cartridges at $15 - $50 every 2 - 3 months. See annual costs, flow tradeoffs, and when under-sink wins.

Canonical: https://watertreatmentpro.com/faucet-water-filter-cost/

Last updated: 2026-11-09

A faucet water filter costs $20 - $100 and uses cartridges at $15 - $50 each, replaced every 2 - 3 months. Annual cost lands at $60 - $200, and five-year ownership is $300 - $800 with no installation.

## The Unit Price

A basic on-tap filter sells for $20 - $40. It typically handles chlorine, taste, and odor, with a small cartridge.

A mid-range unit sells for $40 - $70 and may add a lead or cyst reduction claim, depending on the certification.

A premium unit sells for $70 - $100 with a metal housing and a longer cartridge life. The housing lasts years, and the cartridges are the consumable.

There is no installation charge. The unit screws onto the faucet aerator and removes without tools.

## Cartridge Costs

| Cartridge type | Price | Life | Annual cost |
|---|---|---|---|
| Standard carbon | $15 - $25 | 2 - 3 months | $60 - $100 |
| Carbon with lead reduction | $25 - $40 | 2 - 3 months | $100 - $160 |
| High-capacity | $35 - $50 | 3 - 4 months | $105 - $200 |

A household changing four cartridges a year at $20 spends $80. A household using a lead-certified cartridge at $35 spends $140.

The annual cost is the number that matters. A $30 unit with $50 cartridges costs more over five years than a $70 unit with $20 cartridges.

## Five-Year Arithmetic

The cheapest unit is not the cheapest ownership. The cartridge price and the change interval decide the five-year total.

## What the Certification Buys

A faucet filter certified to NSF/ANSI 42 reduces chlorine, taste, and odor. That is the basic claim.

A filter certified to NSF/ANSI 53 reduces specific health-related contaminants, such as lead or cysts, and the listing names them.

A filter certified to NSF/ANSI 401 covers emerging compounds such as pharmaceuticals. Not every model carries it.

Check the model's listing rather than the box. Certification is per model and per claim.

## Faucet vs Pitcher vs Under-Sink

| Option | Upfront | Annual | Five-year |
|---|---|---|---|
| Faucet filter | $20 - $100 | $60 - $200 | $300 - $800 |
| Pitcher | $25 - $60 | $50 - $100 | $275 - $560 |
| Under-sink | $100 - $400 | $60 - $150 | $400 - $1,000 |

The pitcher is slightly cheaper and slower. The faucet filter is more convenient and occupies the tap. The under-sink unit is out of sight and costs more to install.

Most faucet filters reduce flow. The filtered stream is slower than the unfiltered tap, and filling a pot takes longer.

Some units have a selector that switches between filtered and unfiltered. That is useful for washing vegetables or filling a large pot, and it extends cartridge life.

A household that fills pots daily may find the slower flow annoying. That is the main reason people upgrade to an under-sink system.

## Steps to Choose

1. Check the water report or test for the contaminant you care about.
2. Match the cartridge certification to that contaminant.
3. Price the replacement cartridges, not just the unit.
4. Check the rated capacity in gallons.
5. Confirm the unit fits the faucet thread.
6. Buy one spare cartridge with the unit.

## What the Cost Does Not Include

A water test at $40 - $150 if the contaminant is unknown. The filter choice depends on the result.

Replacement aerator adapters, which cost $5 - $15 if the faucet thread is unusual.

The unit is a small part of the five-year cost. Cartridges are 70 - 85 percent of it.

That is why the cartridge price and the change interval matter more than the unit price. A $30 difference in the unit is trivial next to a $20 difference in each cartridge over five years.

Buy a faucet filter if you rent, if the kitchen has one tap, if the concern is chlorine taste, or if you want a lead-certified filter without installation.

Skip it if you need filtered water at multiple taps, if the flow reduction is unacceptable, or if the contaminant needs RO.

Most faucet filters reduce flow. Some units have a selector that switches between filtered and unfiltered, which is useful for washing vegetables and extends cartridge life, and a household that fills pots daily may find the slower flow annoying enough to upgrade to an under-sink system.

The unit is a small part of the five-year cost: cartridges are 70 - 85 percent of it. Buy a faucet filter if you rent, if the kitchen has one tap, or if the concern is chlorine taste; skip it if you need filtered water at several taps or the contaminant needs RO.

A note on cartridge disposal: spent carbon cartridges go in the trash, not the recycling bin. The plastic housing is usually not recyclable in municipal programs, and the media inside is saturated with what it removed.

Some manufacturers run a take-back program for cartridges. It is worth a look on the brand's site before a year of cartridges goes to the landfill, though most households simply bin them.

One more cost to weigh is time. A faucet filter is slower to fill a pot, and a household that cooks with filtered water may find the under-sink alternative worth the extra $100 - $300 installed simply for the flow.

A final note on the faucet itself: some aerators cannot accept a filter without an adapter, and a few faucets with pull-down sprayers will not fit one at all. Check the thread and the clearance before buying, because a unit that does not fit is a return and a restocking fee.

For the filter category, see [under-sink water filter cost](https://watertreatmentpro.com/under-sink-water-filter-cost/) and [water filter for apartment](https://watertreatmentpro.com/water-filter-for-apartment/). For certification, see [what does reverse osmosis remove](https://watertreatmentpro.com/what-does-reverse-osmosis-remove/).