Reverse osmosis system cost in 2026
Reverse osmosis system costs $300 to $950 in 2026 for most homeowners, with a typical price near $625.
Is your quote fair?
Type the price you were quoted. We compare it to the usual 2026 range of $300 to $950.
What moves the price
- System type and size are the biggest drivers, with whole house units costing far more than under sink ones.
- Plumber labor, a new drain line, or a new outlet add to the bill.
- Extra filter stages, add ons like UV, and a water softener for very hard water also raise the cost.
- Where you live. Labor in big cities costs more than in small towns.
What is included
The range covers labor and materials for a typical reverse osmosis system. It does not include permits unless the tables say so, or extra repairs found once work starts. Get a written quote that lists each part of the job.
Average installed cost by system type
| System type | Average cost installed |
|---|---|
| Portable / countertop RO system | $200 to $450 |
| Whole-house RO system | $4,800 to $8,000 |
| Under sink (with tank) | $300 to $700 |
| Under sink (tankless) | $450 to $950 |
| Large or commercial RO system | $1,800 to $9,500 |
Average prices in US dollars. Source: HomeGuide.
Whole-house RO system cost
| Unit size (gallons per day) | Average unit price | Total installed cost |
|---|---|---|
| 500 | $4,500 to $6,500 | $4,800 to $7,000 |
| 1,000 | $5,000 to $7,000 | $5,300 to $7,500 |
| 1,500 | $5,500 to $7,500 | $5,800 to $8,000 |
Average prices in US dollars. Source: HomeGuide.
Under-sink RO system cost
| System | Average unit price | Total installed cost |
|---|---|---|
| Tank (50 to 400 gallons per day) | $150 to $350 | $300 to $700 |
| Tankless (400 to 1,200 gallons per day) | $300 to $600 | $450 to $950 |
Average prices in US dollars. Source: HomeGuide.
Why this costs more in 2026
Labor is the biggest part of most home jobs, and skilled trade pay keeps rising. Many materials and parts are imported, and freight went up after the oil shock that began with the Iran war in February 2026. Steel, copper, aluminum and resin all cost more too, so quotes for reverse osmosis system are higher than they were a few years ago.
Ways to pay less
- Get several detailed quotes and do not just take the lowest one.
- Test your water first with an inexpensive kit and pick a system that fits your sink so you avoid extra cutting or faucet work.
- Get at least three written quotes and compare them line by line.
Where the price comes from
The range on this page comes from one named price guide. We read every number on its page and show the date it was last updated.
- HomeGuide: Reverse osmosis system cost guide, page dated July 14, 2025
Common questions
How much does this cost in 2026?
Reverse osmosis system costs $300 to $950 in 2026 for most homeowners, with a typical price near $625. Most people pay about $625 per project. The low end is $300 and the high end is $950.
What changes the price the most?
The biggest factors are: System type and size are the biggest drivers, with whole house units costing far more than under sink ones; Plumber labor, a new drain line, or a new outlet add to the bill; Extra filter stages, add ons like UV, and a water softener for very hard water also raise the cost.
How can I pay less?
Get several detailed quotes and do not just take the lowest one. Test your water first with an inexpensive kit and pick a system that fits your sink so you avoid extra cutting or faucet work. Get at least three written quotes and compare them line by line.
Where do these numbers come from?
From one named price guide, HomeGuide. It is linked on this page with the date it was last updated.
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