How does Cave Spring's water compare to the national average?

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

Cave Spring Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

reservoir

pH Level

neutral = 7.0

Lead

0.006 mg/L

✓ Below action level

TDS

359.1 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 Cave Spring, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In Cave Spring	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 Cave Spring compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Cave Spring, Virginia	≈ 120–179 mg/L	8.2 ppt	🟠 Hard	reservoir
Salem, Virginia	≈ 120–179 mg/L	0 ppt	🟠 Hard	reservoir
Roanoke, Virginia	≈ 120–179 mg/L	55.5 ppt	🟠 Hard	reservoir
Hollins, Virginia	≈ 120–179 mg/L	8.8 ppt	🟠 Hard	reservoir
Blacksburg, Virginia	≈ 120–179 mg/L	0 ppt	🟠 Hard	reservoir

National Benchmark

How Cave Spring compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Cave Spring	≈ 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 Cave Spring's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 359.1 mg/LpH: 8

Western Virginia Water Authority (WVWA) serves Cave Spring, Virginia, and surrounding areas in Roanoke County, supplying approximately 182,700 customers. The utility draws from both surface water reservoirs and groundwater supplies across the region, operating multiple water sources and treatment plants. Customers can identify their specific primary water source through WVWA's public GIS mapping tool on the authority's website.

Cave Spring lies within the Ridge and Valley physiographic province of southwestern Virginia, underlain by Ordovician and Silurian carbonate formations including limestone and dolomite. These soluble rock types dissolve as water percolates through soil and bedrock, releasing calcium and magnesium ions that increase water hardness. The karst geology of the region is typical of central Appalachia and results in moderately mineralized water supplies throughout the service area.

At moderately hard levels, Cave Spring residents may notice increased mineral buildup on fixtures, reduced soap effectiveness, and potential scaling in water heaters and appliances over time. A water softener is recommended for households seeking to reduce these effects and extend appliance lifespan. Cave Spring's water contains 5 contaminants above EPA health-based guidelines and the system has recorded 2 MCL violations; residents should consult WVWA's annual Consumer Confidence Reports for current compliance data and use certified filters if concerned about contaminant exposure.

Geology & Source: Ridge and Valley province; Ordovician and Silurian limestone and dolomite dissolve readily — karst terrain releases calcium and magnesium, producing moderately hard water

Other Virginia Water Reports

Salem

≈ 120–179 mg/L

🟠 Hard

Roanoke

≈ 120–179 mg/L

🟠 Hard

Hollins

≈ 120–179 mg/L

🟠 Hard

Blacksburg

≈ 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 Cave Spring's water safe to drink?

Yes. Cave Spring'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 Cave Spring?

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

The USA national average is 151 mg/L. Cave Spring (≈ 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 Cave Spring 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.