What a Home Water Filtration System Costs Over 5 Years

The price tag on a water filter box is the smallest number you will pay for it. Cartridges, membranes, wastewater, and salt accumulate for as long as you own the system, and most product pages do not add them up for you.

This page prices eight system types over five years using named, current models: a pitcher, a faucet filter, two under-sink carbon systems, a tank-style reverse osmosis system, a tankless reverse osmosis system, a whole-house carbon system, a whole-house system paired with a softener, and a private-well treatment train. Every figure below is dated. Where a manufacturer's site blocked automated verification during this run, that is stated rather than filled in from memory.

Quick answer

Certified under-sink carbon and a well-chosen pitcher end up close over five years once you account for how much water a household actually drinks and cooks with, not just what the box label assumes. Reverse osmosis costs more up front and is driven mostly by wastewater, which a tankless design cuts sharply. Whole-house systems and softeners are driven by installation choice as much as by the equipment. Private wells vary the most because raw water chemistry, not brand, decides what equipment is needed.

How this page was built

• Models. Chosen to match the categories most buyers compare: Brita Denali pitcher with the Elite cartridge, PUR PLUS faucet mount, Aquasana Claryum 3-Stage and Multipure Aquaversa under-sink carbon, APEC ROES-50 tank reverse osmosis, Waterdrop G3P600 tankless reverse osmosis, and SpringWell CF1 whole-house carbon.
• Prices. Read from each manufacturer's own product and replacement-filter pages on September 3, 2026, in USD, before tax or shipping. Where a manufacturer's page renders its price through client-side scripting that a direct fetch cannot read, or where the page returned a blocked response, that is stated next to the figure and a named third-party listing is used instead, flagged as lower confidence.
• Installation. Priced at $0 for systems commonly self-installed, with a range added using Angi's reported plumber rate of $80 to $200 an hour for buyers who hire out the job. Angi's own bundled "installed cost" figures are shown separately where the category is normally sold that way (whole-house, softeners, well treatment).
• Wastewater and utility rate. Priced using a combined water-and-sewer rate of $15.33 per 1,000 gallons, derived from the Journal AWWA residential water-and-sewer affordability study (Teodoro and Thiele, 2024), which put the average combined monthly bill at $95.02 for 6,200 gallons of use in 2023. The study's own page returned a blocked response on direct fetch this run; the $95.02-at-6,200-gallons figures were corroborated identically across independent search results.
• Salt. Priced using a commonly cited water-treatment industry figure of about 12 forty-pound bags a year for an average household on moderately hard water, at $5 to $25 a bag depending on salt type. This figure comes from a water-treatment retailer's published cost page, not a government or WQA source, because no such primary figure could be found this run. Treat it as a planning estimate, not a certified number.
• What we did not do. We did not test, buy, or install any system. Every number is a published figure, a manufacturer specification, or a stated planning assumption, and each is labeled as one of those three things.

Five-year cost by system type

Dashes mark cost lines that do not apply to that system type. Every dollar figure above is rounded to match the precision of its source.

What each line actually contains

• Reverse osmosis wastewater is the biggest swing factor in the RO rows. The APEC ROES-50's own owner's manual states two different figures depending on how it is tested: a 25.4 percent recovery rating under lab conditions (about 2.9 gallons of wastewater per gallon of drinking water) and an 11.8 percent efficiency rating under conditions that approximate real daily use with the storage tank installed (about 7.5 gallons of wastewater per gallon of drinking water). The table above uses the real-use figure. The Waterdrop G3P600 is a tankless design and states a 2:1 pure-to-drain ratio, meaning about 0.5 gallons of wastewater per gallon produced, which is why its five-year total lands close to the tank-style system despite a higher equipment price.
• Softener salt varies by water hardness, softener size, and regeneration frequency more than by brand. The $60 to $300 range above reflects sodium chloride at the low end and potassium chloride pellets at the high end, at the commonly cited 12-bags-a-year usage rate. Regeneration itself also uses water, at a rate specific to each softener's control valve settings; check the exact model's owner's manual for its gallons-per-regeneration figure rather than assuming a number.
• Media life on whole-house carbon outlasts this five-year window under normal use. SpringWell's own warranty page states its catalytic carbon reduces chlorine and chloramine below minimum detection levels for six years or 1,000,000 gallons, whichever comes first, so a typical household is unlikely to need a media change inside five years. The sediment prefilter, not the carbon bed, is the recurring cost.
• Buying a full-service installed system instead of a DIY kit changes the whole-house math. The figures above assume you buy SpringWell's kit and either install it yourself or hire a plumber by the hour. If you instead get a complete installed job quoted by a local dealer, Angi's bundled national average for whole-house carbon filtration is $2,273, with a typical range of $1,129 to $3,539, equipment and labor together.
• Private-well systems vary the most because the equipment list depends on what the raw water actually contains. A sediment-only problem needs a $200 to $600 cartridge housing; iron or manganese needs an oxidizing filter at $1,000 to $3,500; bacteria needs UV at $700 to $2,500. Most wells need more than one of these. The private well water filter guide covers which test result points to which piece of equipment, and the water treatment quote checklist covers what a dealer's itemized quote for this category should show before you sign anything.

The capacity math: why a cheap pitcher is not always the cheap option

Every pitcher and faucet filter carries two limits printed on the box: a time interval and a rated gallon capacity. Manufacturers write the replacement rule as "whichever comes first," but most buyers only track the calendar date. Divide the rated gallons by the printed interval and a different number appears: how much water per day that filter actually assumes you will use.

A single adult using a pitcher lightly can go the full six months and stay under the rated capacity. A household of four drinking and cooking with the same pitcher at a combined gallon a day per person, a commonly used planning figure and not a measured average for any specific home, reaches the printed 120-gallon limit in about a month. Past that point, the cartridge is filtering water beyond the volume its certification was tested against, whether or not the calendar says it is still good.

Correcting the Brita Elite's replacement rate to the shorter of the two limits changes its five-year total from $235.89 to roughly $1,255, close to the $1,139.89 list-price total for the Aquasana Claryum 3-Stage, a system with a broader certified contaminant list and far higher flow. The PUR PLUS faucet filter corrects even further, from about $445 to roughly $1,500. Under-sink carbon systems are largely immune to this correction because their rated capacity already sits well above typical household draw.

The practical rule: if more than one or two people are drinking and cooking with a pitcher or faucet filter daily, replace by the gallon count, not the calendar date, and re-check whether an under-sink system is actually the cheaper five-year choice. The replacement cost guide has the per-consumable breakdown for every system type if you want to price a specific household's usage instead of this page's stated assumption.

When RO makes more sense than carbon

Reverse osmosis costs more to run than carbon in every scenario on this page, but it is not optional when a water report shows nitrate, arsenic, fluoride, or high total dissolved solids, none of which a carbon filter is certified to remove at a meaningful rate. The reverse osmosis versus carbon filter guide covers which contaminants require which technology before cost enters the decision at all.

Stated assumptions

• Drinking and cooking water use: 1 gallon per person per day, or 4 gallons a day for a 4-person household, used only for the capacity-math and RO wastewater sections. This is a commonly used planning figure, not a measured average for any specific home.
• Combined water and sewer rate: $15.33 per 1,000 gallons, derived from a 2023 national average residential bill reported in the Journal AWWA (Teodoro and Thiele, 2024).
• Plumber labor: $80 to $200 an hour, per Angi's reported national range, checked 2026-09-03.
• Region: national average, USD, no state or local tax, no regional water-rate adjustment.
• All prices checked September 3, 2026, except SpringWell's CF1 equipment price, which carries its last directly confirmed date of 2026-07-12 because springwellwater.com again returned a blocked response to automated verification during this run.

What this page could not verify

• SpringWell's current CF1 and combo prices. springwellwater.com blocked every direct fetch attempt this run, the same result recorded during the SpringWell versus Aquasana comparison in July. The CF1 figure above reuses this site's last directly confirmed price. The whole-house-plus-softener combo price comes from a third-party retail listing, not SpringWell's own page, and is flagged lower confidence.
• PUR PLUS current system and cartridge prices. pur.com renders pricing through client-side scripts that a direct fetch cannot read, though its capacity specifications loaded directly. The figures above use named retailer listings as a lower-confidence stand-in and state that explicitly. The same is true of the Waterdrop G3P600's system price, though its filter pricing and technical specifications loaded directly on waterdropfilter.com.
• A government or WQA-published salt-usage figure. No EPA, WQA, or cooperative-extension source with a bags-per-year number could be found this run. The 12-bags-a-year planning figure comes from a water-treatment retailer's cost page and should be treated as an estimate, not a certified figure.
• Softener regeneration water volume. This varies by control valve and hardness setting and was not priced on this page; check the specific model's owner's manual.
• UV lamp replacement cost for a well treatment train. Varies by the specific UV unit chosen inside a multi-brand system and was not priced separately in the well-train row.

Frequently Asked Questions

What does a water filter really cost over five years?

It depends on the system type. A certified under-sink carbon system and a well-chosen pitcher land in a similar range, roughly $1,000 to $1,300, once the pitcher's replacement schedule is corrected for real household use rather than the printed calendar interval. Reverse osmosis runs $850 to $1,350 depending mostly on wastewater. Whole-house carbon alone runs $1,350 to $2,300 depending on installation choice, more with a softener added, and private-well treatment varies the most, $2,300 to $7,400, because it depends on what is actually in the water.

Is a cheap pitcher actually cheaper than an under-sink filter?

Only for light use. A single person using a pitcher for drinking water alone can stay within its rated gallon capacity on the printed calendar schedule. A household of four drinking and cooking with the same pitcher daily reaches the rated capacity in about a month, not six, which raises the pitcher's true five-year cost close to a certified under-sink system's list price, without the under-sink system's broader certified contaminant list or faster flow.

Does a tankless reverse osmosis system really save money over a tank system?

Mostly through wastewater, not through the equipment or filters. The Waterdrop G3P600's tankless design states a 2:1 pure-to-drain ratio versus the APEC ROES-50's real-use ratio of roughly 7.5:1 with its storage tank installed, which is the main reason the two systems land in a similar five-year total despite the tankless unit's higher purchase price and higher annual consumable cost.

Why is the well treatment train row such a wide range?

Because private-well equipment is chosen by what the water actually contains, not by brand. A sediment-only problem is a $200 to $600 fix. Iron, manganese, or sulfur usually needs a $1,000 to $3,500 oxidizing filter. Bacteria needs UV at $700 to $2,500. Most wells need more than one of these, and none of it should be bought before testing. The private well water filter guide covers the test panel to run first.

Does a softener add much to the five-year cost of a whole-house system?

Roughly $1,300 to $2,500 more over five years in this page's estimate, split between the added equipment cost and ongoing salt, which itself varies by water hardness and softener size. The water filter versus water softener guide covers whether a softener is solving a problem a filter cannot, before the cost question matters.

Sources

• Brita Denali Pitcher with Elite Filter
• Brita Elite Replacement Filters
• PUR PLUS Faucet Mount and replacement filter specifications
• Aquasana Claryum 3-Stage under-sink system
• Multipure Aquaversa drinking water system
• Multipure Aquaversa CB6 replacement filter
• APEC ROES-50 reverse osmosis system
• APEC complete filter set for Essence ROES-50
• Waterdrop G3P600 reverse osmosis system
• Waterdrop G3P600 RO membrane replacement
• SpringWell warranty and performance guarantee terms
• Angi: water softener installation cost
• Angi: well water treatment systems cost
• Angi: plumber cost
• Teodoro, M.P. and Thiele, K., "Water and Sewer Price and Affordability Trends in the United States, 2017-2023," Journal AWWA, Vol. 116, Issue 7 (2024). Direct fetch blocked this run; figures corroborated across independent search results.