How does Mount Vernon's water compare to the national average?

The USA national average is 151 mg/L. Mount Vernon (≈ 0–59 mg/L) is 121 mg/L softer than average.

Mount Vernon Water Hardness & Quality Report (2026)

Water Hardness

soft

~0–59 mg/L

Soft

estimated · not lab-verified

Source

reservoir

pH Level

7.1

neutral = 7.0

Lead

0.005 mg/L

✓ Below action level

TDS

271 mg/L

Est. Daily Cost

$0.08

energy & soap waste

Source: See methodology section below · Updated 2026

soft~0–59 mg/LSoft · 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 Mount Vernon, your appliances are currently losing 4% efficiency due to mineral buildup.

Appliance	In Mount Vernon	Soft Water City	Efficiency Loss
Kettle	8.2 yrs	8.5 yrs	-4%
Washing Machine	11.5 yrs	12 yrs	-4%
Water Heater	14.4 yrs	15 yrs	-4%

Regional Water Comparison

How Mount Vernon compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Mount Vernon, New York	≈ 0–59 mg/L	0 ppt	🟢 Soft	reservoir
Wakefield, New York	≈ 120–179 mg/L	5.5 ppt	🟠 Hard	reservoir
Baychester, New York	≈ 120–179 mg/L	8.2 ppt	🟠 Hard	reservoir
Wykagyl, New York	≈ 120–179 mg/L	4.5 ppt	🟠 Hard	reservoir
Eastchester, New York	≈ 120–179 mg/L	3.2 ppt	🟠 Hard	reservoir

National Benchmark

How Mount Vernon compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Mount Vernon	≈ 0–59 mg/L	🟢 None
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes Mount Vernon's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 271 mg/LpH: 7.1

Mount Vernon Water Department serves approximately 67,668 residents in Mount Vernon, Westchester County, New York. The utility purchases treated surface water primarily from New York City's vast reservoir system, including the Croton, Kensico, and Hillview reservoirs. Water is delivered via aqueducts without local treatment plants, relying on NYCDEP's advanced filtration and disinfection processes at facilities like the Croton and Catskill systems.

The supply originates from the Catskill/Delaware watersheds in the Appalachian Plateau, encompassing over 2,000 square miles of forested uplands. Underlying geology features Devonian shales, sandstones, and limestones of the Hamilton Group and Marcellus Formation, with limited carbonate dissolution due to acidic rainfall and rapid runoff. Glacial till and thin soils further suppress mineralization, yielding a very soft water character low in dissolved minerals from these non-karstic formations.

As soft water, Mount Vernon's supply promotes excellent soap lathering and minimal scale buildup, posing no risk to water heaters, dishwashers, or pipes. No softener is needed or recommended. Routine flushing of fixtures prevents sediment issues from upstream treatment residuals. Water meets federal standards with zero MCL violations per recent reports, though two contaminants exceed EPA health guidelines (MCLGs), prompting filter recommendations for sensitive groups — potential concerns include traces of Hexachlorocyclopentadiene, nitrates/nitrites, and arsenic. Treatment by NYCDEP involves ozonation, UV disinfection, chloramination, and GAC filtration; pH is typically 7.5–8.5 with full lead/copper rule compliance.

Geology & Source: Catskill/Delaware watershed reservoirs; Devonian Hamilton Group shales and sandstones (Marcellus Formation) — non-karstic formations with glacial till limit mineral dissolution, producing characteristically soft water

Other New York Water Reports

Wakefield

≈ 120–179 mg/L

🟠 Hard

Baychester

≈ 120–179 mg/L

🟠 Hard

Wykagyl

≈ 120–179 mg/L

🟠 Hard

Eastchester

≈ 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 Mount Vernon's water safe to drink?

Yes. Mount Vernon's water meets all federal safety standards. The hardness is ≈ 0–59 mg/L (Soft), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Mount Vernon?

Mount Vernon's water is soft at ≈ 0–59 mg/L. A water softener is generally not necessary, though a carbon filter can improve taste and remove any remaining chlorine.

How does Mount Vernon compare to the USA average?

The USA national average is 151 mg/L. Mount Vernon (≈ 0–59 mg/L) is 121 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 Mount Vernon 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.