How Much Does a Reverse Osmosis System Cost?

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Every source below is a published 2026 estimate. Your actual quote depends on the equipment, your plumbing and local labor rates.

Under-sink (point-of-use) RO

This Old House: point-of-use systems run $150–$1,300. Installation typically costs $300–$700, and point-of-use installs are usually $150–$300.¹
Plumbing Picks: a typical under-sink install lands around $200–$1,000 all-in, with most jobs near $300–$600.²

Whole-house (point-of-entry) RO

This Old House puts whole-house systems at about $1,000–$4,800, with some reaching $10,000 when packaged with a softener.¹

A real Tucson example

Clear Water Concepts publishes Thirst RO pricing of $795 to $995 with professional installation included.³ Prices can change, so confirm with the dealer.

What pushes the price up

Drilling a new countertop hole or running a new drain line²
Tankless or premium multi-stage units²
Whole-house systems that need pretreatment, pumps or storage¹

Get several written quotes. Here's how to compare them.

Sources

Last reviewed Oct 13, 2026. This is general information, not professional advice. Confirm figures with your utility and installer.