Reverse Osmosis System Cost in Orange County
Reverse osmosis cost in two frames kept apart: Frame A counts by system form nationally; Frame B counts installed rows by form.
Orange County, CA · Updated 2026 · Costs shown as ranges — your quote will vary by installer and scope
The reverse-osmosis-alone split, stated head-on first
| Frame | What it counts | 2026 band |
|---|---|---|
| Frame A | whole-house system | $1,000-$4,800 |
| Frame A | countertop / under-sink / tankless | $200-$700 / $200-$800 / $250-$900 |
| Frame A | average installation / annual maintenance | $2,200 / $175-$600 |
| Frame B | under-sink installed / whole-house installed | $300-$950 / $4,800-$8,000 |
| Frame B | unit, average / Culligan installed | $150-$600 / $1,050-$1,700 |
This cluster prices reverse osmosis alone -- a reverse osmosis system bought and fitted as the whole job, as its own ticket. Named apart, never a row here: water softeners, the hardness machine for spots and scale; whole-house filtration, the machine at every tap; under-sink carbon filtration alone, a simpler single-unit purchase and never a membrane system; and the faucet add-on framing, reverse osmosis carried as lines inside a faucet project. The dedicated-faucet and removal lines price on the breakdown guide.
Frame A lines, as reported: the Angi frame
| Frame A line, as printed | 2026 band |
|---|---|
| Whole-house system | $1,000-$4,800 |
| Countertop, point-of-use | $200-$700 |
| Under-sink, point-of-use | $200-$800 |
| Tankless, point-of-use | $250-$900 |
| Fitting labor, average / point-of-use | $300-$700 / $100-$300 |
| Filter sets / membrane replacement | $40-$90 / $30-$100 |
Frame A, counted nationally by system form, with an average installation of $2,200 and annual maintenance at $175 to $600. Its larger-system filter lines print at $100 to $300 a year inside that maintenance band.
Frame B lines, as reported: the HomeGuide frame
| Frame B line, as printed | 2026 band |
|---|---|
| Under-sink installed, with tank / tankless | $300-$700 / $450-$950 |
| Under-sink installed, all rows | $300-$950 |
| Whole-house installed | $4,800-$8,000 |
| Countertop installed | $200-$450 |
| Culligan system, installed | $1,050-$1,700 |
| New filters | $20-$100 |
Frame B, counted as installed rows by form, with unit prices at $150 to $600 on average priced apart from the installed rows. The two frames' whole-house bands diverge sharply: $1,000-$4,800 in Frame A against $4,800-$8,000 in Frame B. That divergence is named as a frame difference on every page here, never averaged and never blended into a single whole-house band.
The neighbours, differentiated
The water softener hub prices the hardness machine in its own lane, apart from the softener bands named apart here. The comparison guide carries reverse osmosis only as a side line at $300 to $1,000 and above plus $50 to $150 a year, and the faucet add-ons guide carries it only inside a faucet project. None prices a reverse osmosis system as its own ticket.
Reading a reverse osmosis quote
- Frame named on every line
- Unit and installed rows read apart
Frequently asked questions
How much does a reverse osmosis system cost in Orange County?
Two frames, never blended. Frame A prints whole-house at $1,000 to $4,800, countertop at $200 to $700, under-sink at $200 to $800, and tankless at $250 to $900, with an average installation of $2,200. Frame B prints under-sink installed at $300 to $950 and whole-house installed at $4,800 to $8,000.
Why do the two frames print such different whole-house figures?
Counting. Frame A counts whole-house systems nationally at $1,000 to $4,800. Frame B counts whole-house installed rows at $4,800 to $8,000 beside under-sink installed rows at $300 to $950. The divergence is a frame difference, never averaged.
What do the unit and brand rows print at, as reported?
Frame B prints unit prices at $150 to $600 on average, apart from its installed rows, and a Culligan system at $1,050 to $1,700 installed. Frame A prints no per-brand unit table; its counting stands in form rows, an average installation of $2,200, and annual maintenance at $175 to $600.
What does the running line print at, as reported?
Frame A prints annual maintenance at $175 to $600, with filter sets at $40 to $90 and membrane replacement at $30 to $100. Frame B prints new filters at $20 to $100, apart from whole-house filter rows at $150 to $250 each on the breakdown guide.
Is a reverse osmosis system the same purchase as a water softener, whole-house filtration, under-sink carbon, or a faucet add-on?
No, head-on: this cluster prices a reverse osmosis system bought and fitted as its own ticket alone. Water softeners, whole-house filtration, under-sink carbon filtration alone, and the faucet add-on framing sit in their own lanes, named apart on every page here, with tank rows apart at $300 to $700 in Frame B.