Jefferson Valley-Yorktown Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

groundwater

pH Level

7.4

neutral = 7.0

Lead

0.004 mg/L

✓ Below action level

TDS

215.3 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 Jefferson Valley-Yorktown, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In Jefferson Valley-Yorktown	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 Jefferson Valley-Yorktown compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Jefferson Valley-Yorktown, New York	≈ 120–179 mg/L	5.3 ppt	🟠 Hard	groundwater
Cortlandt Manor, New York	≈ 120–179 mg/L	0 ppt	🟠 Hard	reservoir
Peekskill, New York	≈ 120–179 mg/L	0 ppt	🟠 Hard	reservoir
Mount Kisco, New York	≈ 180+ mg/L	3.1 ppt	🔴 Very Hard	reservoir
Ossining, New York	≈ 180+ mg/L	4.3 ppt	🔴 Very Hard	reservoir

National Benchmark

How Jefferson Valley-Yorktown compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Jefferson Valley-Yorktown	≈ 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 Jefferson Valley-Yorktown's Water Unique?

Local geology and source profile

Source: GroundwaterTDS: 215.3 mg/LpH: 7.4

The Yorktown Water District supplies Jefferson Valley-Yorktown and nearby communities in northern Westchester County, New York. This district draws its water from the Croton Watershed system, a network that encompasses both surface water and groundwater resources. Operating a dedicated Water Quality Lab at 1080 Spillway Road, Shrub Oak, NY, the Yorktown Water District conducts daily water quality testing to ensure the safe delivery of drinking water to its customers. This commitment to quality is further demonstrated through their publication of annual Consumer Confidence Reports.

The water supply for Jefferson Valley-Yorktown originates from the Croton River watershed. This region is characterized by underlying Precambrian metamorphic bedrock, predominantly gneiss and schist, which is characteristic of the Hudson Highlands. Overlaying this ancient rock are Quaternary glacial deposits. These geological features contribute dissolved minerals, primarily calcium and magnesium, to the water, resulting in its moderately hard quality. This level of hardness aligns with the typical water characteristics found throughout the lower Westchester County area.

Homeowners in Jefferson Valley-Yorktown might observe some minor scale accumulation in appliances like water heaters and dishwashers, as well as in pipes, over extended periods. While not as pronounced as in areas with significantly harder water, this buildup can slightly diminish the lathering effect of soaps and detergents. Some individuals may notice a faint residue on faucets and fixtures. Installing a water softener is an option for those seeking to further reduce mineral deposits, though it's not strictly necessary for most households. Routine descaling of appliances and the use of water-softening additives in laundry detergents can help manage these effects. The Yorktown Water District also notes that four contaminants are present above EPA health-based guidelines (MCLGs), and detailed information is available in their reports.

Geology & Source: Precambrian metamorphic bedrock (gneiss, schist); Quaternary glacial deposits; moderate mineral content produces moderately hard water

Other New York Water Reports

Cortlandt Manor

≈ 120–179 mg/L

🟠 Hard

Peekskill

≈ 120–179 mg/L

🟠 Hard

Mount Kisco

≈ 180+ mg/L

🔴 Very Hard

Ossining

≈ 180+ mg/L

🔴 Very 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 Jefferson Valley-Yorktown's water safe to drink?

Yes. Jefferson Valley-Yorktown'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 Jefferson Valley-Yorktown?

At ≈ 120–179 mg/L (Hard), Jefferson Valley-Yorktown'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 Jefferson Valley-Yorktown compare to the USA average?

The USA national average is 151 mg/L. Jefferson Valley-Yorktown (≈ 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 Jefferson Valley-Yorktown 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.