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Reverse Osmosis Installation Cost Calculator
Can I DIY? · DIY-FriendlyCalculate RO system installation costs and see how quickly it pays back compared to bottled water.
Educational calculators — always consult a licensed professional before making financial decisions.
Installed beneath the kitchen sink with a dedicated faucet. Best for drinking and cooking water; doesn't impact whole-house supply.
Popular brands like APEC, Express Water, or Waterdrop mid-tier. Good filtration performance and filter availability.
Pre-treated water with consistent quality. Standard 4–5 stage RO system is typically sufficient.
Typical family usage including drinking, cooking, and filling a coffee maker. Most standard systems are sized for this.
Most mid-size US cities. Plumber labor rates $55–$80/hr.
Estimated Installation Cost
$400 – $750
Under-Sink RO system, fully installed
vs. Bottled Water
At your usage level, bottled water would cost ~$2,738/yr. An RO system typically pays back in 1–3 years.
Cost Breakdown
Where Your Money Goes
Your Selections
Estimates based on national averages. Actual costs vary by region and contractor.
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What you'll need
- ·RO system type — under-sink, countertop, whole-house, or tankless
- ·Brand tier — budget, mid-range, or premium
- ·Water source — city/municipal or well water
- ·Daily gallon usage for drinking and cooking
What you'll get
- ✓Installation cost — Equipment plus labor estimate
- ✓Annual filter cost — Ongoing replacement expense
- ✓Cost per gallon — Amortized over 5 years
- ✓Bottled water comparison — Payback period vs. buying bottled
How it works
Choose system type
Under-sink RO for kitchen drinking water or whole-house for all fixtures.
Enter household size
Daily gallon usage determines tank size and filter replacement frequency.
Compare to bottled water
Calculate annual cost savings vs. buying bottled water at $1–$1.50 per gallon.
RO System Cost by Type
| Type | Install Cost |
|---|---|
| Under-Sink | $300–$950 |
| Multi-stage / premium under-sink | $500–$1,500 |
| Whole-House | $4,800–$8,000 |
What's included — and what's extra
Usually included
- RO unit & filter stages
- Faucet & tank
- Connection to cold supply & drain
- Basic under-sink install & testing
Often extra
- New drain saddle or air gap
- Electrical outlet for whole-house/permeate pump
- Fridge/ice-maker line
- Remineralization or UV stage
Under-sink vs. whole-house — and running costs
An under-sink RO ($300–$950 installed) treats drinking/cooking water at one tap — right for most homes. A whole-house RO ($4,800–$8,000) treats every tap and is a much bigger job needing a drain line and often electrical.
Ongoing cost: pre/post filters run $50–$100/year; the RO membrane lasts 2–5 years ($50–$150). RO wastes 3–4 gallons per gallon produced — a permeate pump cuts that. Even so, it's far cheaper per gallon than bottled water.
Questions to ask, red flags & warranty
- How many stages, and is remineralization included (RO strips minerals)?
- What's the daily GPD output and the pure-to-waste ratio?
- Is drain and faucet install included? (A leaky drain saddle is the most common callback.)
Warranty: quality systems carry 1–5 year warranties on the unit; keep the model/filter records so replacements fit.
Methodology & sources
The cost figures on this page are generated from a single, sourced cost-data file (Installed by system type. National average estimate for 2026 (~$2,200 average).). Under-sink units are the most common; whole-house RO is a much larger job and may need a drain line and electrical outlet. Labor is $150–$500. Last verified July 2026.
- HomeGuide — Reverse Osmosis System Cost (2026) — retrieved 2026-07-13
- Angi — Reverse Osmosis Water Filter Cost (2026) — retrieved 2026-07-13
About this calculator
How much does reverse osmosis installation cost?+
Reverse osmosis installation cost depends on system type. A standard under-sink RO system runs $300–$950 installed, including the unit and professional installation. Multi-stage or premium under-sink systems cost $500–$1,500. Whole-house RO systems cost $4,800–$8,000 installed. Annual filter costs run $40–$150 per year. Compared to bottled water at $0.15–$2.00 per gallon, under-sink RO produces water for $0.01–$0.03 per gallon, paying back in 1–3 years for most households.
What does reverse osmosis remove from water?+
RO systems remove 95–99% of dissolved solids including: lead, arsenic, fluoride, nitrates, chromium, chlorine and chloramine, PFAS (forever chemicals), and most other contaminants. RO membranes filter down to 0.0001 microns. What RO does not remove: some pesticides and pharmaceuticals require additional carbon filtration. RO also removes minerals like calcium and magnesium — many quality systems add minerals back.
How often do RO filters need to be replaced?+
Pre-filters (sediment and carbon) need replacement every 6–12 months. The RO membrane needs replacement every 2–3 years. Post-filters (polishing carbon) need replacement every 12 months. Total annual filter costs: $40–$80 for under-sink systems, $60–$150 for whole-house. Water quality affects frequency — harder water or high sediment reduces filter life.
Under-sink vs. whole-house RO: which do I need?+
Under-sink RO is the right choice for most households — it provides excellent quality drinking and cooking water at low cost. Whole-house RO is only necessary when the entire water supply needs filtration (severe contamination, industrial areas, certain agricultural regions). Whole-house RO wastes 3–4 gallons for every gallon filtered and requires expensive equipment — it's rarely needed for typical residential use.
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Back to the calculator ↑Reverse Osmosis Installation Cost Calculator is built and maintained by the RealCostIQ editorial team. Cost ranges and rates are checked against published industry data and contractor quotes, and revised when the underlying figures move. Read our data methodology or more about who builds this. Every calculation runs in your browser — no account, and none of your inputs are stored.
Cost ranges and rates here are checked against contractor quotes and published industry data. If a number still looks off, email Support@RealCostIQ.com and we'll review and fix it.