PLUMBING
Reverse Osmosis System Cost: In 2026
Estimate reverse osmosis system installation cost — with the free water calculator.
A reverse osmosis system gives you the purest tap water — zero minerals, zero taste issues. The range is wide. Here's the real 2026 cost.
THE SHORT ANSWER
The short answer
Reverse osmosis systems run $1,000–$4,000 installed in 2026 (average $2,500). Under-sink systems run $150–$1,000; whole-house RO runs $1,000–$6,000. Installation labor runs $100–$500.
What it costs
An under-sink RO system runs $150–$1,000. A whole-house RO system runs $1,000–$6,000. Professional installation runs $100–$500. Filters and membranes run $50–$150 per year. Remineralization stages add $100–$300.
- Under-sink: $150–$1,000
- Whole-house: $1,000–$6,000
- Installation: $100–$500
- Annual filters: $50–$150
RO vs carbon filter
RO removes nearly everything — minerals, heavy metals, PFAS — the purest water you can get. Carbon filters remove chlorine, taste and odor but not minerals. RO wastes 3-4 gallons per gallon produced; newer systems are more efficient.
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