How does Dix Hills's water compare to the national average?

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

Dix Hills Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

reservoir

pH Level

7.9

neutral = 7.0

Lead

0.006 mg/L

✓ Below action level

TDS

300.2 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 Dix Hills, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In Dix Hills	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 Dix Hills compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Dix Hills, New York	≈ 120–179 mg/L	6.4 ppt	🟠 Hard	reservoir
Elwood, New York	≈ 120–179 mg/L	4.1 ppt	🟠 Hard	reservoir
Deer Park, New York	≈ 120–179 mg/L	5.7 ppt	🟠 Hard	reservoir
Wyandanch, New York	≈ 120–179 mg/L	4.5 ppt	🟠 Hard	reservoir
Commack, New York	≈ 120–179 mg/L	8.3 ppt	🟠 Hard	reservoir

National Benchmark

How Dix Hills compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Dix Hills	≈ 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 Dix Hills's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 300.2 mg/LpH: 7.9

Dix Hills Water District serves the Dix Hills community in Suffolk County, New York, on Long Island, providing municipal water to the Town of Huntington area. The water supply is drawn from the Long Island aquifer system, which consists of multiple groundwater zones tapped through production wells distributed across the service territory. No local reservoirs or surface water sources are used; the supply is exclusively groundwater accessed through the district's well network.

The Long Island aquifer system is composed of Quaternary-age glacial deposits — sand, gravel, and clay — overlying Cretaceous-age sedimentary formations. These permeable sand and gravel layers allow groundwater to remain in extended contact with mineral-bearing rock, dissolving calcium and magnesium ions over time. The result is a moderately hard water supply characteristic of Long Island's hydrogeological environment, where groundwater naturally accumulates dissolved minerals as it percolates through the subsurface layers.

At the moderately hard classification, Dix Hills water may cause some scale buildup in water heaters, dishwashers, and kettles over time, though the effect is less severe than in hard or very hard water areas. Residents may notice reduced soap and detergent efficiency and slight mineral deposits on fixtures. A water softener is recommended for those concerned about appliance longevity and cleaning performance, though it is not essential for health or safety. Dix Hills tap water meets all EPA Maximum Contaminant Level Goals (MCLGs), with all tested contaminants within safe levels according to health-based guidelines; the supply is compliant and potable as delivered.

Geology & Source: Long Island aquifer system — Quaternary glacial sand and gravel overlying Cretaceous sand and clay formations; permeable layers dissolve calcium and magnesium, yielding moderately hard groundwater

Other New York Water Reports

Elwood

≈ 120–179 mg/L

🟠 Hard

Deer Park

≈ 120–179 mg/L

🟠 Hard

Wyandanch

≈ 120–179 mg/L

🟠 Hard

Commack

≈ 120–179 mg/L

🟠 Hard

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Frequently Asked Questions

Is Dix Hills's water safe to drink?

Yes. Dix Hills'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 Dix Hills?

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

The USA national average is 151 mg/L. Dix Hills (≈ 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 Dix Hills 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.