Spotty dishes, dry skin, scale on faucets, or a funny taste or smell from the tap usually point to a water-quality issue. Two different tools fix two different problems — a filter improves what's in your water, and a softener removes the hardness minerals that cause scale. Here's what each costs in Northern Virginia and how to tell which one you need.
Quick Answer: What Does Water Treatment Cost?
For Cardinal Plumbing Heating & Air customers in Sterling and Northern Virginia:
- Water filtration typically runs $800–$7,000.
- Water softeners typically run $5,000–$11,000.
These are planning ranges. A single-fixture or point-of-use filter lands near the low end of filtration; a whole-house system or a softener sized for a larger home moves toward the high end.
Water Treatment Cost Table
| Service | Cardinal typical range | Best fit |
|---|---|---|
| Service call / diagnosis | $97 | Every visit — credited toward the work |
| Water filtration | $800–$7,000 | Taste/odor, sediment, or contaminant concerns; point-of-use up to whole-house |
| Water softener | $5,000–$11,000 | Hard water — scale, spotty dishes, dry skin/hair, reduced appliance life |
| Filtration and softening solve different problems and are priced separately. Many homes benefit from both — a softener for hardness and a filter for taste, odor, or specific contaminants. |
|---|
Filter vs. Softener — What's the Difference?
- Water softener — removes the calcium and magnesium that make water "hard." Hard water leaves scale in pipes, water heaters, and fixtures, spots glassware, and can make soap less effective. A softener protects your plumbing and appliances and is the fix for hardness specifically.
- Water filter — improves what's in the water: sediment, chlorine taste/odor, or specific contaminants, depending on the filter type. Ranges from a point-of-use filter at one fixture to a whole-house system.
If your main complaint is scale and spotty dishes, you likely want a softener. If it's taste, smell, or a contaminant concern, you likely want filtration. A water test confirms which.
What Changes the Price?
For water filtration ($800–$7,000):
- Type of filter — a point-of-use cartridge vs. a whole-house or specialty system.
- Size of the home — more demand and more plumbing to tie into.
- Fixture-only vs. whole-house — treating one tap vs. every tap in the home.
For a water softener ($5,000–$11,000):
- Type/size of system — sized to the home's water use and hardness level.
- Size of the home — capacity scales with demand.
- City vs. well water — well water often carries more hardness, iron, or other minerals that affect the system and sizing.
These factors aren't cumulative — each system is sized and priced for your home. The ranges reflect the difference between a simple filter at one fixture and a whole-home system tuned to your water.
A Note for Northern Virginia Homeowners
- Hardness varies across the area. Homes on city/municipal water (much of Fairfax and parts of Loudoun) and homes on private wells (common in more rural Loudoun) can have very different water — which is exactly why sizing depends on city-vs-well and a water test.
- Hard water shortens appliance life. Scale buildup is hard on water heaters, dishwashers, and washing machines, and it's a common, often-unnoticed cost over time — one reason softeners are popular here.
- Well water adds variables. Iron, sediment, or odor on well water may call for filtration in addition to softening.
A water test is the right first step — it tells you exactly what's in your water so you treat the real issue instead of guessing.
Signs You May Need Water Treatment
- White, chalky scale on faucets, showerheads, and glassware
- Spotty dishes and soap that won't lather well
- Dry skin and hair after showering
- A metallic, sulfur ("rotten egg"), or chlorine taste or smell
- Reduced water pressure from scale buildup
- Appliances (water heater, dishwasher) wearing out faster than expected
Get an Upfront Water Treatment Price
Cardinal Plumbing Heating & Air is locally owned and serves Sterling, Alexandria, Gainesville, Herndon, and surrounding Northern Virginia communities. Licensed (VA Contractor #2705153728), available 24/7 with same-day service when possible, upfront pricing, and a 100% satisfaction guarantee.
Call (703) 721-8888 or schedule at cardinalplumbingva.com.
Frequently Asked Questions
How much does a water softener cost in Northern Virginia?
For Cardinal customers, a water softener typically runs $5,000–$11,000, depending on the system size, your home's water use, and whether you're on city or well water.
How much does a water filtration system cost?
Water filtration typically runs $800–$7,000 for Cardinal customers, depending on the type of filter, the size of the home, and whether you're treating one fixture or the whole house.
What's the difference between a water softener and a filter?
A softener removes the hardness minerals (calcium and magnesium) that cause scale and spotty dishes. A filter improves what's in the water — taste, odor, sediment, or specific contaminants. Many homes use both.
Do I need a softener or a filter?
If your main issue is scale, spotty dishes, or dry skin, you likely need a softener. If it's taste, smell, or a contaminant, you likely need filtration. A water test confirms which.
Does well water need different treatment than city water?
Often, yes. Well water can carry more hardness, iron, or odor, which affects both the type of system and its sizing. That's why pricing depends on city vs. well water.
Related Cardinal services
<u>Plumbing</u> · <u>Water Filtration</u> · <u>Water Softeners</u> · <u>Water Heaters</u> · <u>Water Leak Detection</u>
Sources (authoritative facts cited above)
- U.S. Geological Survey — water hardness (calcium & magnesium) overview
- U.S. EPA — drinking water / point-of-use & point-of-entry treatment basics
- Local water hardness varies (Fairfax Water / Loudoun Water — confirm current published hardness)