How does Bull Run's water compare to the national average?

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

Bull Run Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

reservoir

pH Level

7.5

neutral = 7.0

Lead

0.001 mg/L

✓ Below action level

TDS

132.3 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 Bull Run, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In Bull Run	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 Bull Run compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Bull Run, Virginia	≈ 120–179 mg/L	4.2 ppt	🟠 Hard	reservoir
Sudley, Virginia	≈ 120–179 mg/L	9.8 ppt	🟠 Hard	reservoir
Manassas Park, Virginia	≈ 120–179 mg/L	17.6 ppt	🟠 Hard	reservoir
Manassas, Virginia	≈ 0–60 mg/L	38.2 ppt	🟢 Soft	reservoir
Linton Hall, Virginia	≈ 120–179 mg/L	8.7 ppt	🟠 Hard	reservoir

National Benchmark

How Bull Run compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Bull Run	≈ 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 Bull Run's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 132.3 mg/LpH: 7.5

Prince William Water operates the Bull Run Mountain and Evergreen Water System, supplying customers on Bull Run Mountain and in the Evergreen community in Prince William County, Virginia. This modest groundwater system draws about 92,000 gallons daily from wells, separate from the county's larger surface water operations. The utility, previously the Prince William County Service Authority, reported meeting all state and federal water quality standards in its 2024 reports for its five distribution systems. The water originates in the Bull Run watershed, a part of the Occoquan River basin that flows to the Potomac. Groundwater seeps through Piedmont bedrock, which includes ancient metamorphosed volcanic and sedimentary rocks, giving the water its mineralized quality with higher levels of calcium and magnesium.

The Bull Run Mountain and Evergreen Water System taps into fractured bedrock aquifers within the Piedmont physiographic province of northern Virginia. This area is characterized by metamorphic and igneous rocks, such as gneiss, schist, and granite formations belonging to the Virginia Piedmont terrane, dating from the Precambrian to Paleozoic eras. These crystalline rock types gradually release calcium and magnesium ions as groundwater flows through them over extended periods. While the local geology doesn't feature extensive limestone deposits, the weathering of these rocks is sufficient to raise the water's hardness significantly.

Scale buildup is a common consequence of this water's mineral content, affecting appliances like kettles, dishwashers, washing machines, and water heaters, which can lead to reduced efficiency and a shorter lifespan. Homeowners often notice a white residue on glassware or visible mineral particles in ice cubes. Simple remedies like regular descaling with vinegar or using cartridge filters can help manage these effects. For households that use a lot of water, installing a whole-house water softener is often recommended to minimize appliance wear and improve how well soaps and detergents lather, while also preventing potential pipe corrosion from overly soft water. The water's neutral pH and disinfection treatment ensure it meets safety standards.

Geology & Source: Piedmont metamorphic and igneous bedrock; gneiss, schist, and granite formations; prolonged groundwater contact elevates calcium and magnesium, resulting in hard water.

Other Virginia Water Reports

Sudley

≈ 120–179 mg/L

🟠 Hard

Manassas Park

≈ 120–179 mg/L

🟠 Hard

Manassas

≈ 0–60 mg/L

🟢 Soft

Linton Hall

≈ 120–179 mg/L

🟠 Hard

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Frequently Asked Questions

Is Bull Run's water safe to drink?

Yes. Bull Run'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 Bull Run?

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

The USA national average is 151 mg/L. Bull Run (≈ 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 Bull Run 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.