Lorton Water Hardness & Quality Report (2026)
Water Hardness
~120–179 mg/L
Hardestimated · not lab-verified
Source
reservoir
pH Level
5.9
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
158.4 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 Lorton, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Lorton | 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 Lorton compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Lorton, Virginia | ≈ 120–179 mg/L | 4.8 ppt | 🟠 Hard | reservoir |
| Newington, Virginia | ≈ 120–179 mg/L | 5 ppt | 🟠 Hard | reservoir |
| West Springfield, Virginia | ≈ 120–179 mg/L | 8.7 ppt | 🟠 Hard | reservoir |
| Lake Ridge, Virginia | ≈ 120–179 mg/L | 5.3 ppt | 🟠 Hard | reservoir |
| Springfield, Virginia | ≈ 120–179 mg/L | 7.1 ppt | 🟠 Hard | reservoir |
National Benchmark
How Lorton compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Lorton | ≈ 120–179 mg/L | 🟠 Moderate |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
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What Makes Lorton's Water Unique?
Local geology and source profile
Lorton, Virginia is served by Fairfax Water, which provides drinking water to over 2 million people across Fairfax County. The primary sources are the Potomac River and Occoquan Reservoir, treated at the Potomac Treatment Plant in Fairfax Station and the Griffith Treatment Plant near Burke. Lorton falls within this service area, receiving blended surface water after advanced filtration and disinfection processes — including coagulation, sedimentation, ozonation, filtration, and chloramination — to meet federal and state Safe Drinking Water Act standards.
The Potomac River watershed spans 14,670 square miles across four states, draining diverse geology from Appalachian highlands to coastal plain sediments. Upstream, the river erodes Paleozoic schists, gneisses, and Triassic sandstones, while tributaries contact carbonate rocks that impart dissolved minerals. The Occoquan Reservoir collects runoff from similar Piedmont terrain within Cretaceous coastal plain sediments overlying fractured metamorphic bedrock; limestone and dolomite outcrops in upstream tributaries contribute dissolved calcium and magnesium ions, yielding a moderately hard supply.
Moderately hard water promotes scale buildup in pipes, water heaters, dishwashers, and washing machines, reducing efficiency; white mineral deposits appear on fixtures, glassware, and ice cubes while soap lathering decreases. Regular vinegar descaling, installing low-flow aerators, and periodic appliance flushing help; a water softener is often recommended for persistent scaling. Fairfax Water's annual reports confirm EPA compliance including lead and copper rule adherence via corrosion control; no PFAS exceedances noted, with granular activated carbon and membrane filtration addressing organics; pH is maintained neutral to slightly alkaline.
Geology & Source: Potomac River watershed and Occoquan Reservoir, Piedmont province; Paleozoic schists, gneisses, Triassic sandstones, Cretaceous coastal plain sediments; carbonate outcrops in upstream tributaries yield moderately hard supply
Other Virginia Water Reports
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Frequently Asked Questions
Is Lorton's water safe to drink?
Do I need a water softener in Lorton?
How does Lorton compare to the USA average?
Data Sources & Methodology
Water quality data for Lorton 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.