Water Filtration System Cost Calculator
Estimate the true cost of a home water filtration system — pitcher, reverse osmosis, whole-house, or softener — including the filters and salt you buy for years, not just the sticker price.
What does a home water filter cost? Pick a system type and how it's installed for the upfront price — plus the filters or salt you'll keep buying, the part that's easy to overlook.
System type
The kind of water treatment, from a countertop pitcher to a whole-house system. This is the biggest cost driver by far.
Installation
Whether a plumber installs it or you do it yourself. DIY removes the install labor; whole-house systems and softeners often need a pro (and sometimes a permit).
Upfront Cost
$350 – $950
Under-Sink RO · professional install
Don't forget the upkeep
Beyond the upfront cost, plan on $60–$150 a year for filters or salt — about $300–$750 over 5 years. Put replacements on a reminder; a spent filter stops protecting your water and can strain the system.
Estimates use 2026 national averages and vary widely with brand, water quality, and region. DIY removes the install labor, but whole-house systems and softeners often need a plumber and sometimes a permit. Most importantly, test your water first — the right system depends on what's actually in it (a softener for hardness, reverse osmosis for dissolved solids, carbon for taste and chlorine, UV for bacteria); buying the wrong type is the costliest mistake. Figures exclude optional service contracts and the minor water and electricity a softener or RO system uses.
💡About this calculator▼
"How much does a water filtration system cost?" has a sticker-price answer and a real answer, and they're often very different. A $30 pitcher whose filters run $80 a year quietly costs more over five years than many under-sink units. A whole-house system is a four-figure install, but the cartridges keep coming. This calculator gives you both numbers: the upfront cost to buy and install, and the recurring filter or salt cost that follows.
Pick your system type — pitcher or faucet filter, under-sink carbon, reverse osmosis, whole-house filter, water softener, or a whole-house-plus-softener combo — and choose DIY or professional install. You'll get the upfront cost, the annual recurring cost, and a 5-year total so you can see how it adds up.
The recurring cost is the part nearly everyone underestimates, so it's surfaced right alongside the price. Whether you're comparing options or just budgeting for one, seeing the ongoing cost — not just the shelf price — is what keeps a "cheap" filter from quietly becoming the expensive one.
The calculator reports cost in two parts — upfront and ongoing — and adds a 5-year total to show how they combine.
The upfront cost is the equipment plus, if you choose professional installation, the plumber's labor. System type sets both: a pitcher is a few tens of dollars and needs no install, while a whole-house system or softener is a four-figure unit that usually wants a pro (often $300–$800 of the total). Choosing DIY removes that install labor — sensible for a pitcher or under-sink filter, more ambitious for a whole-house system. (A pitcher has no install either way.) This upfront figure is the headline, because it's what most people are really asking.
The annual recurring cost is what you spend every year to keep it working: replacement filters and cartridges, reverse-osmosis membranes, or bags of softener salt. It's where the surprises live, because a low-priced system can carry a high filter habit.
To make that ongoing cost concrete without asking you to guess how long you'll own the system, the tool adds a fixed 5-year total — the upfront cost plus five years of recurring cost. That single number is what reveals when a cheap unit with pricey filters quietly costs more than a sturdier one. The exact formula and a worked example are below.
📐How it's calculated▼
The estimate combines a one-time upfront cost with the recurring cost, and projects a fixed 5-year total.
Step 1 — Upfront: Upfront = Equipment + Install (install added only if you choose Professional; $0 for DIY or a pitcher)
Step 2 — Annual recurring: Recurring = Yearly filter / membrane / salt cost
Step 3 — 5-year total: 5-year total = Upfront + (Recurring × 5)
Each system type carries its own low–high equipment, install, and annual ranges, so every figure comes out as a realistic range.
Example: An under-sink reverse-osmosis system, professionally installed
→ Upfront (equipment $200–$600 + install $150–$350): $350–$950
→ Annual recurring (filters + membrane): $60–$150
→ 5-year total: $350–$950 + ($60–$150 × 5) = $650–$1,700
So an RO system that "costs $300" is really closer to $650–$1,700 once the install and five years of filters are counted — which is why the recurring cost is shown right next to the price.
📎Source: NSF — Water Treatment & Filtration Standards
🔍Finding your inputs▼
System type: The single biggest cost driver. A pitcher or faucet filter is cheapest to buy and treats water at one spot, but filters are frequent. An under-sink carbon filter plumbs into one tap and targets taste, odor, and chlorine. Under-sink reverse osmosis (RO) is the most thorough point-of-use option, removing dissolved solids, but wastes some water and has more filters. A whole-house filter treats every tap from where water enters the home. A water softener isn't a filter at all — it removes hardness minerals to stop scale and spots. The combo pairs a whole-house filter with a softener.
Installation: Choose DIY if you'll install it yourself, which removes the labor cost — realistic for pitchers and many under-sink units. Choose professional for whole-house systems and softeners, which involve cutting into your main water line and sometimes a permit, and where a pro is the safer call. (A pitcher needs no installation, so the choice doesn't apply.)
That's all you set — system type and install. The results then show the upfront cost, the annual recurring cost, and a fixed 5-year total, so you can weigh the price against the ongoing cost without having to guess how long you'll keep the system.
⚠️Special situations▼
I don't know what kind of system I need
Start with a water test, not a purchase — the right system depends entirely on what's in your water. Your utility likely publishes a free annual water-quality report (look up your 'Consumer Confidence Report'), and inexpensive home test kits or a certified lab can check well water. Match the problem to the tool: hardness and scale → a softener; bad taste, odor, or chlorine → carbon; dissolved solids, lead, or a long contaminant list → reverse osmosis; bacteria (common on wells) → UV. Buying before testing is how people end up with an expensive system that doesn't fix their actual issue.
Is a cheap pitcher actually cheaper than an under-sink filter?
Often not, over time — which is the whole point of looking at cost of ownership. A pitcher is nearly free to buy but its filters are small and frequent, so the annual cost can rival or exceed a plumbed-in under-sink filter that uses larger, longer-lasting cartridges. Run the numbers both ways here over five years: if you drink a lot of filtered water, the under-sink unit often wins on total cost and convenience, while a pitcher makes sense for low volume or renters who can't modify plumbing.
Can I install a whole-house system or softener myself?
It's possible for a confident DIYer, and selecting DIY here removes the $300–$800 install labor — but go in clear-eyed. These tie into your main water line, often need a nearby drain and an electrical outlet, and may require a permit or inspection depending on your area. A mistake means leaks under pressure. If you're comfortable with soldering or push-fit plumbing and shutting down the main, DIY can save real money; if not, the pro cost buys correct sizing, a warranty, and no flooded basement.
How much does a water softener really cost to run?
Beyond the upfront unit and install, a softener's main ongoing cost is salt — typically a 40-pound bag every month or two, which lands around $50–$150 a year for most households (more for very hard water or a large family). There's also a small amount of water and electricity used during regeneration. This calculator includes the salt as the recurring cost; the water and power are minor enough that they're noted but not itemized. Harder water and more people both push salt use up.
I want to compare two systems before buying
That's exactly what the 5-year total is for. Run the calculator once for each system you're weighing and compare the 5-year totals rather than the sticker prices. A system with a higher upfront cost but cheaper, less-frequent filters can easily beat a cheap unit with an expensive filter habit once a few years of replacements are counted. Just make sure both options actually address what your water test found, or the comparison is moot.
❓Common questions▼
How much does a water filtration system cost?
It depends heavily on the system type and its ongoing filter costs. Roughly: a pitcher or faucet filter is $25–$60 to buy plus $40–$120 a year in filters; an under-sink reverse-osmosis system runs $200–$600 (plus install) with $60–$150 a year in filters; a whole-house filter is often $900–$3,300 installed with $100–$300 a year in cartridges; and a water softener is similar to install plus salt. Over five years, total costs commonly land from a few hundred dollars for a pitcher to several thousand for a whole-house combo. Enter your specifics above for a tailored range.
What ongoing costs come with a water filter?
Replacement filters and cartridges are the main one, and they're easy to underestimate — they recur every few months to once a year depending on the system and your usage. Reverse-osmosis systems also need a membrane every few years, water softeners need salt (a bag every month or two), and UV systems need an annual lamp. There can be minor water and electricity use too. This calculator shows the annual recurring cost and a 5-year total right next to the price precisely because that ongoing spend often outweighs the purchase price.
Is it cheaper to install a water filter myself?
For pitchers and many under-sink filters, yes — they're designed for DIY and the install cost is essentially zero. For whole-house systems and softeners, professional installation typically adds $300–$800 because it means cutting into your main water line, often with a drain and power nearby and sometimes a permit. DIY can save that if you're comfortable with plumbing, but a mistake risks leaks under full pressure. Toggle DIY vs professional above to see the difference for your system.
Do I need a water softener or a water filter?
They solve different problems, so it depends on your water. A softener removes hardness minerals (calcium and magnesium) that cause scale, spotting, and dingy laundry — it doesn't make water safer to drink. A filter removes contaminants and improves taste and odor but doesn't address hardness. Homes with both hard water and contaminant concerns sometimes need both, which is the combo option. Test your water first to know which you actually need; that decision matters far more to your wallet than shaving a bit off the install price.
How long do water filtration systems last?
The equipment itself often lasts a long time — a good whole-house system or softener can run 10–20 years, and under-sink units many years — but only if the consumable parts are replaced on schedule. Filters and cartridges are the wear items, and a neglected filter not only stops working but can harbor bacteria or restrict flow. The 5-year total here captures the early ownership cost; over a 10–20 year equipment life, the recurring replacements keep adding up — and they're what keep the system actually working that whole span.