ServiCover📌 Key Takeaway: Under-sink RO systems cost $300-$950; whole-house RO $4,800-$8,000. Replacement filters range from $20-$100 for under-sink units to $150-$250 for whole-house systems.
Costs
| Type | Installed Cost | Filter Replacement |
|---|---|---|
| Under-sink RO | $300-$950 | $20-$100 per filter |
| Whole-house RO | $4,800-$8,000 | $150-$250 per filter |
Pros and Cons
| Pros | Cons |
|---|---|
| Removes a wide range of dissolved contaminants | Produces wastewater during filtering |
| Great-tasting drinking water | Slower flow at the tap |
| Compact under-sink units | Removes minerals too (some add them back) |
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Get Free Quotes →Frequently Asked Questions
Do most homes need whole-house RO?
Usually not — under-sink RO for drinking and cooking water is the most common and cost-effective choice.
How often are RO membranes replaced?
Commonly every 2-3 years, with pre-filters changed more often. Follow the manufacturer schedule.
🔎 How we research: The ServiCover Editorial Team compiles prices and guidance from published 2026 cost guides, manufacturer information and industry sources. Prices are national ranges and vary by location, home and provider, so always compare written quotes. We don't perform the work ourselves, and we may earn a commission when you request quotes through our partners — see our Advertiser Disclosure.