Plumbing
Whole house water filtration cost
Whole-house water filtration is about $2,106 installed for a carbon tank on city water — the chlorine taste gone from every tap — or $983 for cartridge housings that cost more to keep. On a well the lab test decides: sediment, an iron filter and UV are about $4,037 with the test. Lead and PFAS are treated where you drink, with reverse osmosis under the kitchen sink for $698, not for the whole house at $13,599. Test first; the system follows from the water.
Written and edited by Pablo Ruiz Quintero
Last reviewed 2026-09-25 · Nothing you type leaves your browser
Whole house water filtration cost calculator
What is in the water
The system follows from the water. Pick what you see or what the test showed, and the treatment is built in the order it has to go.
The utility's yearly report lists what is in it.
Tick every one that applies.
Full flow, media lasts years.
Sets the tank size.
The main is cut after the meter, a bypass and two runs go in, the outside taps are left hard if the plumbing allows it, and a drain line is found or made.
Backwashing valves and UV plug in.
Floor drain, standpipe or utility sink.
Skipping it is how the wrong system gets bought.
A plumber or water-treatment dealer.
Used only to pick a regional labour rate. It stays in your browser.
Carbon tank, installed
$2,106
$80 a year to keep · $2,906 over 10 years
City water, whole house
Carbon. 3.7 hours of plumbing.
Taste versus health
Whole-house carbon is for chlorine, not lead.
A whole-house carbon tank is certified for taste, odour and chlorine. Lead, PFAS, nitrate and arsenic are treated where you drink, with an under-sink unit certified to NSF 53 or 58 — for about a fifth of the price.
Buying it and keeping it
Each piece installed on its own for a 2-bathroom house, and ten years of upkeep.
What the plumber charges for
- Carbon tank
A tank of activated carbon for the chlorine taste and smell of city water. The media lasts five to ten years; full flow to every tap. Certified NSF 42. About $80 a year to keep.$1,400 - Bypass, valves and fittings
A bypass so the house has water while the system is serviced.$120 - 3.7 hours of plumbing
The main is cut after the meter, a bypass and two runs go in, the outside taps are left hard if the plumbing allows it, and a drain line is found or made.$426 - Trip charge
The plumber's call-out, once for the whole job.$160
What it costs
National average. carbon tank, for city water and 2 bathrooms, a new tie-in — no loop. Not included: a softener, well repairs, or replumbing the outside taps.
Hard water, with the salt, on the water softener page; the water heater the scale ruins, on the water heater page; the kitchen faucet an RO tap sits beside, on the faucet page.
Worth knowing
- Carbon tank: $1,400 for the unit, $706 to install. Then about $80 a year — the media lasts five to ten years; full flow to every tap.
- On city water, read the utility's Consumer Confidence Report first: it is free, it lists what is in the water each year, and it says whether the disinfectant is chlorine or chloramine. Lead is the exception — it comes from a house's own pipes and fixtures, so it is tested at your tap.
- A whole-house carbon filter is certified for taste, odour and chlorine (NSF 42). It is not a lead or PFAS filter — for those, an under-sink unit certified to NSF 53 or 58 at the kitchen tap.
- No loop: the main is cut after the meter, a bypass goes in, and each stage is plumbed in turn — 3.7 hours for this train.
On this page — 5 sections
The system follows from the water
The short version
- City water, carbon tank: $2,106. For chlorine taste and smell.
- A well: $4,037 for sediment, iron and UV, with the lab test.
- Lead or PFAS: $698 for reverse osmosis at the kitchen tap.
- Test first. It is the cheapest part and it decides the rest.
There is no single whole-house water filter that suits every house. There is a treatment for each thing in the water, and the price is the sum of the treatments the water needs, installed in the order they have to go. On city water that is usually one carbon tank for the chlorine. On a well it is often three or four pieces. And health contaminants — lead, PFAS, nitrate, arsenic — are usually not treated for the whole house at all, but at the kitchen tap, where they are drunk.
$2,106
Carbon tank
City water
$983
Cartridges
Cheaper to buy
$4,037
Well train
3 stages + test
$698
Under-sink RO
Lead, PFAS
MaterialsEstimator, Water filtration system price survey · checked 2026-09-25
Test first: city water and wells
On city water, the utility has already tested it: every public system publishes a Consumer Confidence Report each year listing what was found, and it says whether the water is disinfected with chlorine or chloramine — which decides between ordinary and catalytic carbon. The one thing it cannot tell you about is lead, because lead comes from a house’s own service line, solder and fixtures; that is tested at your tap for about $75. On a private well, nobody tests the water but the owner: a certified lab panel for about $250 before buying anything, and bacteria and nitrate every year after.
U.S. Environmental Protection Agency, Consumer Confidence Reports and private drinking water wells · checked 2026-09-25
| City water | Private well | |
|---|---|---|
| What is in it | The utility's free yearly report | A lab test, about $250 |
| Usual problem | Chlorine or chloramine taste | Sediment, iron, acidity, bacteria |
| Usual treatment | Carbon tank, $2,106 | A train, $4,037 |
| Yearly upkeep | $80 | $200 |
Taste at every tap, health at the kitchen tap
A whole-house carbon filter is certified for taste, odour and chlorine — NSF/ANSI 42. It is not what takes out lead or PFAS. Those are removed by units certified to NSF/ANSI 53 or, for reverse osmosis, 58, and the sensible place for them is under the kitchen sink, feeding a small faucet for drinking and cooking. Whole-house reverse osmosis exists, but it is about $13,599 installed, sends several gallons to the drain for every one it makes, and makes water pure enough to corrode copper pipe unless it is remineralized.
| Under-sink RO | Whole-house RO | |
|---|---|---|
| Installed | $698 | $13,599 |
| A year to keep | $100 | $740 |
| Ten years | $1,698 | $20,999 |
| Treats | Drinking and cooking water | Every tap, toilet and shower |
| Side effects | A little waste water | Much more waste water; corrosive water |
NSF International / ANSI, NSF/ANSI 42, 53, 55, 58 and 401 — Drinking water treatment units · checked 2026-09-25
Ten years, not one
Cartridge systems are cheap to buy and keep costing: a sediment and a carbon cartridge every three to six months. Tanks cost more and the media lasts years. Over ten years the two come close — $2,483 for two cartridge housings on city water against $2,906 for the carbon tank — and the tank pulls ahead after about 16 years. What decides it is the house: a tank gives full flow with several bathrooms, where cartridges are felt when two showers run, and it needs no changes. A four-bathroom house needs a larger tank: $2,806 installed.
MaterialsEstimator, Water softener installation price survey · checked 2026-09-23
What goes wrong
Before buying
- The utility's yearly report read, or a lab test done on the well.
- Chlorine or chloramine — it decides the carbon.
- Lead tested at the kitchen tap.
- Health contaminants treated at the tap, with NSF 53 or 58.
- A loop, a drain and an outlet near the main — or priced in.
- Ten years of cartridges and media added up.
01Buying before testing
A filter for the wrong problem does nothing for the real one.
Instead — The report, or a lab test.
02A whole-house carbon filter for lead
It is certified for chlorine, not lead.
Instead — An NSF 53 or 58 unit at the kitchen tap.
03Ordinary carbon on chloramine
It barely touches it.
Instead — Catalytic carbon.
04UV on cloudy or iron-laden water
Particles shade the bacteria from the light.
Instead — Sediment and iron removed first.
05Cartridge housings on a big house
They restrict the flow and need changing every few months.
Instead — A tank sized to the bathrooms.
06Whole-house RO for drinking water
Ten times the price, and corrosive water.
Instead — RO under the kitchen sink.
- 01Find out what is in the waterCity water: read the utility's annual report and test for lead at your tap. Well water: a certified lab panel.
- 02Separate taste from healthChlorine, sediment, iron and smell are whole-house problems. Lead, PFAS, nitrate and arsenic are treated where you drink.
- 03Build the train in orderSediment first, then acid neutralizing, then iron, then carbon, then a softener, then UV last.
- 04Check the plumbingA softener loop, a drain and an outlet near the main make the installation an hour or two instead of an afternoon.
- 05Size it to the houseTanks by bathrooms and flow; cartridge housings restrict a large house.
- 06Price ten years, not oneCartridges, media, lamps and membranes can cost more over ten years than the equipment did.
Scale and spots are a softener’s job, not a filter’s. It goes after the filters in the line, and it is sized in grains with ten years of salt on its own page.
Hard water too- Point of entry (POE)
- Treatment on the main where water enters the house, so every tap gets it: whole-house filtration.
- Point of use (POU)
- Treatment at one tap, usually under the kitchen sink, for drinking and cooking water.
- Activated carbon
- Porous carbon that adsorbs chlorine, taste and odour. Catalytic carbon is a treated version that also handles chloramine.
- Chloramine
- A disinfectant made of chlorine and ammonia, used by many utilities because it lasts longer in the pipes. Harder to remove than chlorine.
- Reverse osmosis (RO)
- Water pushed through a membrane that holds back dissolved contaminants — lead, PFAS, nitrate, arsenic — with some water sent to the drain.
- Backwash
- A tank filter's periodic cleaning: water runs backwards through the media and out to the drain. Needs a drain and an outlet.
- Treatment train
- Several treatment steps in series, in the order that lets each one protect the next.
- Consumer Confidence Report (CCR)
- The annual water-quality report every public water system must publish. Free, and the first thing to read on city water.
- NSF/ANSI 42, 53, 58, 55
- The certifications that say what a unit removes: 42 for taste and chlorine, 53 for health contaminants, 58 for RO, 55 for UV.
- Bypass valve
- A valve set that lets the house take unfiltered water while the system is serviced.
Common questions
- How much does a whole-house water filtration system cost?
- On city water, about $2,106 installed for a carbon tank that takes out the chlorine taste and smell, or $983 for two cartridge housings. On a well, it depends on the test: sediment, an iron filter and UV are about $4,037 with the lab test. Upkeep adds $80 to $200 a year.
- How much does it cost to install a whole-house water filter?
- The installation is mostly the plumbing: cutting the main after the meter, a bypass, and a drain and outlet for backwashing tanks — about 3.7 hours and a trip charge, $706 for one tank. On a softener loop the builder left, it is $412.
- Is a whole-house water filter worth it on city water?
- For the taste and smell of chlorine in every shower and tap, yes — that is what a whole-house carbon filter does well. For lead or PFAS, no: those are treated at the kitchen tap with a certified under-sink unit. Read the utility's annual report first; it lists what is actually in the water.
- How much does a reverse osmosis system cost?
- An under-sink RO unit at the kitchen tap is about $698 installed and $100 a year in filters and membrane — about $400 if you fit it yourself. Whole-house RO is about $13,599 with the storage tank, repressurizing pump and a sediment prefilter, and $740 a year; it is rarely the right answer.
- What filter do I need for well water?
- The one the lab test calls for. Typically a sediment filter first, an acid neutralizer if the pH is low, an air-injection filter for iron, manganese or the rotten-egg smell, and UV last if there were bacteria — about $4,037 for sediment, iron and UV with the test, $5,639 for the full train with a neutralizer and an under-sink RO.
- How much does a well water test cost?
- About $250 for a certified lab panel covering bacteria, nitrate, iron, manganese, pH, hardness and arsenic, and $75 for a lead-and-basics test on city water. It is the cheapest part of the job and the one that decides everything else.
- Does a whole-house filter soften water?
- No. Hardness — calcium and magnesium — is removed by a softener, which exchanges it for sodium; a filter does not touch it. The softener goes after the filters, and it is priced, with ten years of salt, on its own page.
- How much does it cost to maintain a whole-house water filter?
- A carbon tank is about $80 a year — the media every five to ten years. Cartridge housings are $150 a year in cartridges — cheaper to buy, and the gap closes to $2,483 against $2,906 over ten years, with a cartridge change every few months. UV is a lamp a year, about $100.
- Can I install a whole-house water filter myself?
- Cartridge housings, yes, with push-fit or compression fittings: about $420 in parts. An under-sink RO is an afternoon. Tanks are heavy and need a drain, an outlet and a cut into the main, and most people hire that part.
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About the author
Pablo Ruiz Quintero — Editor
Editor of MaterialsEstimator. Decides which documents count as a source, what every default value is, and where the line sits between what the reader parses and what the engines compute.
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