How does South Riding's water compare to the national average?

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

South Riding Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

reservoir

pH Level

7.7

neutral = 7.0

Lead

0.004 mg/L

✓ Below action level

TDS

220.7 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 South Riding, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In South Riding	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 South Riding compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ South Riding, Virginia	≈ 120–179 mg/L	6 ppt	🟠 Hard	reservoir
Chantilly, Virginia	≈ 120–179 mg/L	9.5 ppt	🟠 Hard	reservoir
Broadlands, Virginia	≈ 120–179 mg/L	8.9 ppt	🟠 Hard	reservoir
Oak Hill, Virginia	114.5 mg/L	5.8 ppt	🟡 Moderately Hard	reservoir
Centreville, Virginia	≈ 120–179 mg/L	9.3 ppt	🟠 Hard	reservoir

National Benchmark

How South Riding compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ South Riding	≈ 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 South Riding home

Shop water softeners on Amazon.com →

Shop Now

What Makes South Riding's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 220.7 mg/LpH: 7.7

South Riding, Virginia is served by Loudoun Water, the primary utility providing drinking water to Loudoun County. The utility draws from two main sources: the Potomac River and Goose Creek. Water from the Potomac River is treated by both Loudoun Water and Fairfax Water (a wholesale supplier), ensuring compliance with Safe Drinking Water Act standards enforced by the Virginia Department of Health. The service area encompasses South Riding and surrounding communities in northern Virginia.

The Potomac River watershed dominates the region's hydrology; South Riding is drained by Elklick Run, a tributary of Cub Run and part of the Bull Run system. Geologically, the area sits within the northern Virginia Piedmont, underlain by Paleozoic carbonate and siliciclastic rock formations including limestone and dolomite. These mineral-rich strata naturally dissolve into groundwater and surface water, imparting dissolved calcium and magnesium that characterize the water supply as moderately hard, consistent with Virginia's statewide average.

At moderately hard levels, residents may notice scale buildup in kettles, reduced soap effectiveness, and mineral deposits on fixtures over time. Appliances such as water heaters and dishwashers experience gradual scaling; periodic descaling or maintenance is advisable. Many homeowners choose to install point-of-use softeners or whole-house systems for appliance longevity, though softening is not essential for health. Loudoun Water provides annual Consumer Confidence Reports (CCRs) to customers by July 1 each year; residents can access reports online or contact their Customer Relations team at 571-291-7880.

Geology & Source: South Riding — Loudoun County, Potomac River watershed; Paleozoic carbonate and siliciclastic formations including limestone and dolomite of the northern Virginia Piedmont dissolve calcium and magnesium; moderately hard water

Other Virginia Water Reports

Chantilly

≈ 120–179 mg/L

🟠 Hard

Broadlands

≈ 120–179 mg/L

🟠 Hard

Oak Hill

114.5 mg/L

🟡 Moderately Hard

Centreville

≈ 120–179 mg/L

🟠 Hard

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 South Riding's water safe to drink?

Yes. South Riding'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 South Riding?

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

The USA national average is 151 mg/L. South Riding (≈ 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 South Riding 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.