Well Water Filtration System Cost: Equipment, Installation and What It Costs to Run

Well water filtration system cost is really three bills: the equipment, the labor to put it in, and the consumables and utilities it eats for the next ten to twenty years. This guide keeps them apart. Equipment prices for the systems we rank come from the retailer pages in our product data, with the date we read them, and sit in the table below. Installation and maintenance ranges are quoted from published cost guides with the date we read each one, because we do not install systems and will not invent a number.

The system you need is decided by your water test, not by your budget; the cheapest way to buy equipment is to buy the right pieces once.

Cost by system type

The published guides agree on the shape of the market even where their numbers differ. HomeAdvisor's water treatment cost guide (updated June 19, 2026, read 2026-10-05) puts the average installed home filtration system at $2,275 with a typical range of $1,129 to $3,541, and breaks it out by type: a well-water filter at $1,000 to $4,000, an activated carbon filter at $800 to $1,500, a UV unit at $500 to $1,500, a reverse osmosis system at $1,000 to $4,800, a chemical injector at $600 to $1,500 and a water softener anywhere from $200 to $6,000. HomeAdvisor also prices systems by number of stages, from $300 to $1,000 for a single stage up to $300 to $2,300 for five.

What each of those labels means for a well:

• Sediment filter. The single-stage end of the range: a spin-down screen or a cartridge housing. The cheapest piece of any treatment train. See sediment in well water.
• Iron, manganese and sulfur filter. The "well-water filter" line in most guides: a backwashing tank with an air-injection head or catalytic media. Price tracks tank size and media type. See iron, manganese and sulfur. A chemical-feed system (chlorine or peroxide injection with a contact tank) is the dealer-installed answer for severe cases, and the "chemical injector" line covers it.
• Water softener. This Old House's softener cost guide (updated June 16, 2026, read 2026-10-05) narrows the wide range: a single-tank ion-exchange softener at $500 to $1,700, a dual-tank unit at $1,000 to $5,000, and a salt-free conditioner at $800 to $4,000. The same guide lists budget-brand units at $800 to $1,800 and premium dealer brands at $2,500 to $4,500. See hard well water.
• UV disinfection. The $500 to $1,500 range covers residential units; NSF/ANSI 55 Class A units sit at the top of it. See bacteria in well water.
• Whole-house carbon. A tank of granular or catalytic carbon for taste, odor, chlorine after a chemical feed, or low-level sulfur and PFAS. The $800 to $1,500 range is for the tank; a PFAS-certified system costs more.
• Reverse osmosis. This Old House's RO guide (updated March 30, 2026, read 2026-10-05) splits it: a point-of-use under-sink unit at $150 to $1,300 and a whole-house point-of-entry system at $1,000 to $4,800. For a well, RO is almost always the under-sink kind, used for nitrate or PFAS at the kitchen tap.

The table below is the price of each system we review, as read on the retailer's page on the date shown. It is generated from our data so it never drifts from what we verified.

Prices change and sale prices change faster. Check the current price on the retailer page before you decide, and see the best well water filtration systems for how those units rank by problem.

Installation labor

The guides line up:

• HomeAdvisor (read 2026-10-05): labor of $300 to $500 for a filtration system, with plumbers at $45 to $200 per hour for additional work.
• This Old House softener guide (read 2026-10-05): professional installation of $150 to $1,000, with most homeowners paying $500 to $700, plus $200 to $800 if additional plumbing is needed.
• This Old House RO guide (read 2026-10-05): $150 to $300 for an under-sink unit, $300 to $700 for a standard whole-house installation, up to $1,500 for a complex one.
• Fixr's water treatment cost guide (updated January 31, 2025, read 2026-10-05): labor of $150 to $1,000 for an ion-exchange softener, and $600 to $2,000 to add a softener loop where the plumbing has no place to tie one in.

Permits are a separate line. Bob Vila's filtration cost guide (updated August 2022, read 2026-10-05) lists permits at $100 to $600; whether you need one depends on your county, and the installation guide covers when a permit and an inspection are likely. For local quotes, the installer directory lists contractors by state.

Yearly consumables

This is the bill the sales brochure leaves out, and it varies more by system type than the purchase price does.

Cartridges. A cartridge sediment filter or a carbon block is replaced on a pressure-drop or time schedule. This Old House's softener guide (read 2026-10-05) puts replacement filters at $20 to $50 each; how many you buy a year depends on how much sediment the well throws, which is why heavy sediment wells are better served by a spin-down or a backwashing filter with no cartridges at all. See sediment filter replacement.

Salt. This Old House (read 2026-10-05) puts softener salt at $5 to $10 per month, with a 40 lb bag lasting six to eight weeks for a typical household. Fixr (read 2026-10-05) prices a bag of salt at $10 to $15 and potassium chloride, the alternative for sodium-restricted households, at $30 to $40 per bag, with a total monthly operating cost of $10 to $40. A demand-initiated (metered) valve regenerates only when the resin is actually spent, which is the single biggest lever on salt use.

UV lamp and sleeve. Lamps lose output long before they burn out, so they are replaced on the maker's schedule rather than when they fail, and the quartz sleeve is cleaned at the same time and replaced when it is scratched or clouded. Lamp prices are on the product pages linked from the table above; they are not a cost-guide figure, so we do not quote a range.

Service. HomeAdvisor (read 2026-10-05) puts annual maintenance for a whole-house system at $50 to $300. This Old House (read 2026-10-05) lists professional softener servicing at $150 to $300 a year and resin cleaning at $100 to $200, both optional if you do it yourself.

Electricity and water for backwashing

Backwashing tanks (iron filters, softeners, carbon tanks) send water to the drain on a schedule, and the control valve and any UV lamp run on house power. Neither is large, but both are real.

Water. Penn State Extension's water softening article puts a regeneration at about 50 gallons, and works an example in which a four-person house at 75 gallons per person per day on 10 gpg water regenerates about every six to seven days. That is roughly 52 regenerations and about 2,600 gallons a year down the drain, which matters if the drain is a septic system or the well is low-yield. An iron filter backwashes on its own timer, often more frequently; the manual lists its backwash flow rate and duration, and multiplying them gives the gallons per cycle.

Electricity. The U.S. Energy Information Administration's Electric Power Monthly, Table 5.6.A puts the average U.S. residential rate at 18.31 cents per kWh for July 2026. A control valve draws a few watts between cycles, so its yearly cost is small. A UV lamp runs continuously, which is where the money goes: the yearly cost is watts × 8,760 hours ÷ 1,000 × $0.1831. As an illustration only, a lamp you assume draws 40 W would use about 350 kWh a year, or about $64 at that rate; substitute your lamp's rating and your own rate from the EIA table.

What pushes the price up

• More problems on the test. Each contaminant class is another tank. A house with iron, hardness and bacteria needs three; a house with hardness alone needs one.
• Flow rate and household size. Bigger households need bigger tanks and larger valves. The sizing tool works that out from your fixtures and test numbers; oversizing is wasted money, undersizing is wasted equipment.
• High iron or manganese. Above the rating of an air-injection unit, the answer is a chemical feed and a contact tank, which moves the job into the chemical injector range and adds a dealer.
• Dealer brands versus online. This Old House's $2,500 to $4,500 premium-brand range against $800 to $1,800 for budget brands is the clearest illustration. Dealer systems include sizing, installation and service; online systems do not.
• Certification. An NSF/ANSI 55 Class A UV or a 53/58-certified PFAS unit costs more than an uncertified one that looks the same.

DIY versus pro

A cartridge or spin-down filter is a two-union job most homeowners can do in an afternoon. A softener or iron filter is a half-day with a drain and an outlet already in place. The savings are real: This Old House (read 2026-10-05) estimates $500 to $1,000 saved on a softener install and up to $1,000 on a whole-house RO. The risk is also real; the same guide puts water damage from a failed DIY connection at $2,000 to $10,000 or more. The installation guide walks through the steps; if the job needs a new drain, a new circuit, a chemical feed or a permit, hire it out through the installer directory.

A worked example: a four-person farmhouse

Assume a four-person house on a well with moderate iron, hard water and a coliform positive that persisted after shocking the well. The train is a sediment filter, an air-injection iron filter, a softener and a UV unit, in that order. Using only the ranges quoted above:

The low end is a DIY install of online equipment at the small end of each range; the high end is a dealer system with a plumber. The spread inside the iron-filter line alone is why the test comes first: a 2 mg/L iron well and a 9 mg/L iron well buy very different tanks.

Before you spend any of it, run your test results through the sizing tool, compare the ranked systems on the best well water filtration systems page, and get at least one quote from the installer directory so you know what the pro price is in your county.