Drinking water
How much does a reverse osmosis system cost?
Under-sink, installed$300–$950published national range
Whole house$4,800–$8,000installed
Filters$50–$250per year
Under-sink reverse osmosis typically costs $300 to $950 installed. Whole-house reverse osmosis is $4,800 to $8,000.
| System | Installed range |
|---|---|
| Under-sink, one faucet | $300 to $950 |
| Whole house | $4,800 to $8,000 |
| Replacement filters, per year | $50 to $250 |
Most homes only need it at the kitchen tap, for drinking and cooking. Whole-house reverse osmosis costs far more and sends more water to the drain.
What moves the price
- Tank size and filter stages
- Running a line to the refrigerator or a second faucet
- Countertop drilling for the faucet
- A permeate pump, where water pressure is low
Sources: HomeGuide, HomeAdvisor.
These are published ranges and general guidance, not quotes. In the Bay Area, Soft Patagonian offers free water tests.
Common questions
How much does under-sink reverse osmosis cost?
About $300 to $950 installed, according to HomeGuide. HomeAdvisor gives a wider range of $250 to $1,300.
What are the yearly costs of reverse osmosis?
Filter replacement typically runs about $50 to $250 a year.