How does Falls Church's water compare to the national average?

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

Falls Church Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

reservoir

pH Level

7.8

neutral = 7.0

Lead

0.004 mg/L

✓ Below action level

TDS

237.1 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 Falls Church, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In Falls Church	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 Falls Church compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Falls Church, Virginia	≈ 120–179 mg/L	6.2 ppt	🟠 Hard	reservoir
West Falls Church, Virginia	≈ 0–60 mg/L	6.5 ppt	🟢 Soft	reservoir
Idylwood, Virginia	≈ 120–179 mg/L	4.8 ppt	🟠 Hard	reservoir
Baileys Crossroads, Virginia	≈ 120–179 mg/L	5.7 ppt	🟠 Hard	reservoir
McLean, Virginia	≈ 120–179 mg/L	9 ppt	🟠 Hard	reservoir

National Benchmark

How Falls Church compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Falls Church	≈ 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 Falls Church's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 237.1 mg/LpH: 7.8

Falls Church, Virginia, receives its water from Fairfax Water, a utility that serves the northern part of the state. The Fairfax Water supply originates from two main sources: the Potomac River and the Occoquan Reservoir. Water treatment is managed through several facilities, including the Frederick P. Griffith Jr. Water Treatment Plant, ensuring a consistent supply for residents across Fairfax County and neighboring areas.

The region's water originates from the Piedmont physiographic province. This area's geology features metamorphic bedrock, specifically schist and gneiss, alongside Paleozoic sedimentary layers that can include limestone and dolomite. As water flows through these mineral-rich formations, it picks up dissolved calcium and magnesium, contributing to the moderately hard to hard water quality typical for Falls Church.

Homeowners in Falls Church might notice the effects of moderately hard water, such as white mineral deposits, or scale, forming on fixtures like faucets and showerheads, as well as inside appliances such as kettles and dishwashers. You may also find that soaps and detergents aren't as effective as they could be, and sediment can build up in water heaters over time. While softening isn't necessary for health, some residents opt for whole-house or point-of-use systems to reduce these aesthetic issues and potentially extend the lifespan of their appliances.

Geology & Source: Piedmont province metamorphic terrain; schist, gneiss, and Paleozoic sedimentary formations yield moderately hard to hard water.

Other Virginia Water Reports

West Falls Church

≈ 0–60 mg/L

🟢 Soft

Idylwood

≈ 120–179 mg/L

🟠 Hard

Baileys Crossroads

≈ 120–179 mg/L

🟠 Hard

McLean

≈ 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 Falls Church's water safe to drink?

Yes. Falls Church'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 Falls Church?

At ≈ 120–179 mg/L (Hard), Falls Church'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 Falls Church compare to the USA average?

The USA national average is 151 mg/L. Falls Church (≈ 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 Falls Church 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.