Fairfax Station Water Hardness & Quality Report (2026)
Water Hardness
~120–179 mg/L
Hardestimated · not lab-verified
Source
reservoir
pH Level
7.2
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
195.5 mg/L
Est. Daily Cost
$0.40
energy & soap waste
Source: See methodology section below · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Fairfax Station, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Fairfax Station | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.8 yrs | 8.5 yrs | -20% |
| Washing Machine | 9.6 yrs | 12 yrs | -20% |
| Water Heater | 12 yrs | 15 yrs | -20% |
Regional Water Comparison
How Fairfax Station compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Fairfax Station, Virginia | ≈ 120–179 mg/L | 5.5 ppt | 🟠 Hard | reservoir |
| Kings Park West, Virginia | ≈ 120–179 mg/L | 6.1 ppt | 🟠 Hard | reservoir |
| Fairfax, Virginia | ≈ 120–179 mg/L | 5.3 ppt | 🟠 Hard | reservoir |
| Burke, Virginia | ≈ 120–179 mg/L | 4.5 ppt | 🟠 Hard | groundwater |
| Oakton, Virginia | ≈ 120–179 mg/L | 7.6 ppt | 🟠 Hard | reservoir |
National Benchmark
How Fairfax Station compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Fairfax Station | ≈ 120–179 mg/L | 🟠 Moderate |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
Bring Scarsdale-quality water to your Fairfax Station home
Shop water softeners on Amazon.com →
What Makes Fairfax Station's Water Unique?
Local geology and source profile
Fairfax Water is the main provider for Fairfax Station, Virginia, supplying treated water to more than 2 million residents across Fairfax County, Prince William County, and parts of Loudoun County. Their supply originates from the Potomac River and Occoquan Reservoir, which is fed by the Occoquan River. Water undergoes advanced treatment at four facilities: Frederick P. Griffith Jr. on the Occoquan Reservoir, and James J. Corbalis Jr., McMillan, and Dalecarlia on the Potomac River. This treated water flows through an interconnected system, with Prince William Water also drawing from the Griffith plant for nearby areas. The watershed spans the Potomac River basin and the Occoquan Reservoir catchment in the Piedmont region.
Geologically, the area is characterized by Paleozoic and Mesozoic sedimentary rocks and Quaternary alluvial deposits. Key formations include limestone and dolomite outcrops, particularly within the Piedmont physiographic province. As these carbonate-rich rocks weather, they release calcium and magnesium into the surface water. This natural process, influenced by regional karst features, is the primary reason for the supply's hard water characteristics, making it moderately mineralized.
This hard water can lead to scale buildup in household plumbing, water heaters, dishwashers, and washing machines, potentially shortening their lifespan and reducing efficiency. You might also notice reduced soap lathering and spots on glassware after washing. To manage scale, regularly descale fixtures and consider using vinegar for cleaning items like tea kettles. For persistent issues and to help appliances last longer, installing a water softener is often recommended. While Fairfax Water meets stringent quality standards, testing your home's plumbing for lead is advisable if it was installed before 1986.
Geology & Source: Paleozoic and Mesozoic sedimentary rocks, including limestone and dolomite; carbonate-rich formations cause hard water.
Other Virginia Water Reports
Report an Issue
Notice an error or missing data? Help us keep this page accurate. If you spot incorrect water hardness, outdated utility info, or missing details, please let us know.
All reports are reviewed by our team. Thank you for supporting data quality!
Frequently Asked Questions
Is Fairfax Station's water safe to drink?
Do I need a water softener in Fairfax Station?
How does Fairfax Station compare to the USA average?
Data Sources & Methodology
Water quality data for Fairfax Station is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.
Water Hardness
Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.
pH
Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.
TDS — Total Dissolved Solids
Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.
PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances
EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.
Lead
Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.
Appliance Lifespan
Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.