How does Dranesville's water compare to the national average?

The USA national average is 151 mg/L. Dranesville (≈ 120–179 mg/L) is 1 mg/L softer than average.

Dranesville Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

reservoir

pH Level

7.3

neutral = 7.0

Lead

0.006 mg/L

✓ Below action level

TDS

323.6 mg/L

Est. Daily Cost

$0.40

energy & soap waste

Source: See methodology section below · Updated 2026

hard~120–179 mg/LHard · est.

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 Dranesville, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In Dranesville	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 Dranesville compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Dranesville, Virginia	≈ 120–179 mg/L	7.6 ppt	🟠 Hard	reservoir
Reston, Virginia	≈ 120–179 mg/L	6 ppt	🟠 Hard	reservoir
Sugarland Run, Virginia	≈ 120–179 mg/L	9.9 ppt	🟠 Hard	reservoir
Herndon, Virginia	≈ 120–179 mg/L	267.1 ppt	🟠 Hard	reservoir
Great Falls, Virginia	≈ 120–179 mg/L	8.8 ppt	🟠 Hard	reservoir

National Benchmark

How Dranesville compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Dranesville	≈ 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 Dranesville's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 323.6 mg/LpH: 7.3

Fairfax Water draws its supply for Dranesville, Virginia, from two main sources: the Potomac River and the Occoquan Reservoir. These waters are processed at several treatment plants before reaching residents in Fairfax County and beyond. The Dranesville area itself sits within the Potomac River watershed, a region characterized by the geology of northern Virginia's Piedmont province.

The ground beneath Dranesville is composed of metamorphic rocks like schist and gneiss, interspersed with sedimentary formations dating back to the Paleozoic era. As water travels through this mineral-rich landscape, it picks up dissolved calcium and magnesium. This natural process results in a water supply that Fairfax Water classifies as moderately hard to hard, with levels fluctuating based on precipitation and groundwater influences.

Homeowners in Dranesville might observe mineral buildup on faucets, dishes, and inside appliances. White spots on glassware after washing or visible particles in ice cubes are common signs of this hard water. To combat scale formation on appliances like water heaters or to improve soap's lathering ability, a water softener is often a good investment. For immediate surface cleaning, commercial descaling solutions can effectively remove mineral deposits.

Geology & Source: Piedmont metamorphic terrain (schist, gneiss) and Paleozoic sedimentary rocks; dissolved calcium and magnesium create moderate to hard water

Other Virginia Water Reports

Reston

≈ 120–179 mg/L

🟠 Hard

Sugarland Run

≈ 120–179 mg/L

🟠 Hard

Herndon

≈ 120–179 mg/L

🟠 Hard

Great Falls

≈ 120–179 mg/L

🟠 Hard

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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 Dranesville's water safe to drink?

Yes. Dranesville's water meets all federal safety standards. The hardness is ≈ 120–179 mg/L (Hard), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Dranesville?

At ≈ 120–179 mg/L (Hard), Dranesville's water will cause significant limescale on kettles, washing machines, and water heaters. A water softener or descaler is strongly recommended to extend appliance lifespan and reduce energy bills by up to 20%.

How does Dranesville compare to the USA average?

The USA national average is 151 mg/L. Dranesville (≈ 120–179 mg/L) is 1 mg/L below the national average. The softest major city is Scarsdale at just 0.02 mg/L.

Data Sources & Methodology

Water quality data for Dranesville is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.

Estimated

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.

Estimated

Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.

Estimated

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.

Measured

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.

Modelled

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.

Calculated

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.