Where does your water come from?
Most of Fairfax, Loudoun and Prince William is on city water from Fairfax Water or Loudoun Water. If you have a well, the answer changes and so does the price.
How many bathrooms?
This sets the size of the whole-home tank, which is the main thing that moves the install either way.
What actually bothers you? Pick everything that applies.
Pick at least one to see your price.
Your recommended system
Installed price, including labor. Northern Virginia, as of 17 August 2026.
All three systems, all three prices
You do not have to use the calculator. Here is the whole price list.
| System | What it reaches | Installed |
|---|---|---|
| Reverse Osmosis (RO) Under the kitchen sink |
Kitchen tap. The water you drink and cook with. | $1,950 |
| Whole-Home Softener + Carbon Where water enters the house |
Every tap, shower, bath and the laundry. | $2,800 |
| Combined System Both, bundled |
Whole house, plus a drinking stage at the kitchen. | $4,990 |
The honest caveat about the whole-home unit
Softener resin and carbon do a great job on hardness, scale, chlorine and disinfection byproducts. They do not remove PFAS, nitrate or chromium-6. That is the under-sink Reverse Osmosis job. So if what worries you is what your family drinks, the whole-home unit on its own is not the answer, and anyone selling it to you as one is overselling. That is exactly why the two pair into the Combined system.
What these prices do and do not include
- Included: the equipment, the install labor, the fittings, and the bypass so the system can be serviced without shutting your water off.
- Not included on well water: a well needs its own test first. Depending on what comes back, a well system can need UV for bacteria, an acid neutralizer for low pH, or iron treatment. Those are real added cost and we will not pretend otherwise by quoting you a city-water number.
- Sizing: larger homes get the larger tank. It is a modest difference and it is confirmed on site, not guessed from a web form.
- The visit is free. The onsite check confirms the final price before anything is ordered. If the number moves, you hear it before you commit, not after.
Read your water data before you buy anything
My Free Water Report publishes the contaminant data for 58 water systems across Virginia, DC and Maryland. Enter your ZIP and you will see what is actually detected in the water at your address, which tells you which of the three systems above you actually need. Do that first. It works just as well as a defense against us as it does against anyone else.