Dyker Heights Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

reservoir

pH Level

8.1

neutral = 7.0

Lead

0.007 mg/L

✓ Below action level

TDS

386.2 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 Dyker Heights, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In Dyker Heights	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 Dyker Heights compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Dyker Heights, New York	≈ 120–179 mg/L	7.5 ppt	🟠 Hard	reservoir
Bath Beach, New York	≈ 120–179 mg/L	0 ppt	🟠 Hard	groundwater
Borough Park, New York	≈ 0–60 mg/L	6.1 ppt	🟢 Soft	reservoir
Fort Hamilton, New York	≈ 120–179 mg/L	6.4 ppt	🟠 Hard	reservoir
Sunset Park, New York	≈ 120–179 mg/L	7.6 ppt	🟠 Hard	reservoir

National Benchmark

How Dyker Heights compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Dyker Heights	≈ 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 Dyker Heights's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 386.2 mg/LpH: 8.1

The New York City Department of Environmental Protection (DEP) supplies water to Dyker Heights in Brooklyn, serving over 8 million residents across the five boroughs. Water originates from 19 reservoirs and three controlled lakes in the Catskill/Delaware systems (including Hillview and Kensico) and the Croton system, traveling via the Delaware and Catskill Aqueducts to treatment facilities including the Croton Water Treatment Plant in Van Cortlandt Park and the Catskill Delaware Ultraviolet Treatment Facility. Dyker Heights receives blended water through the city's distribution network.

The Catskill/Delaware Watershed spans 2,000 square miles in Ulster, Greene, Delaware, and Schoharie counties, protected by 2,100 miles of forested buffer lands. The Croton Watershed covers 375 square miles in Westchester and Putnam counties. Predominant geology includes ancient Fordham Gneiss, Manhattan Schist, and granite of Precambrian age, with localized Paleozoic shales and sandstones in the Croton system. This resistant bedrock yields very soft water from Catskill/Delaware sources due to low solubility, while Croton adds moderate mineralization from minor carbonate influences, resulting in a moderately hard blended supply.

Moderately hard water in Dyker Heights causes moderate scale buildup on fixtures, dishes, and appliances like kettles, coffee makers, and water heaters, reducing efficiency over time. Showers may feel less soapy, leaving slight residue on skin and hair. Maintenance includes regular vinegar descaling of faucets and showerheads, using dishwasher rinse aids, and cleaning washing machine drums. A water softener is optional but recommended for scale-sensitive appliances. NYC DEP water meets EPA standards with pH typically 7.0–8.0; older buildings in Dyker Heights may have elevated lead risks from internal pipes and flushing taps is advised. PFAS has been detected below advisory levels per 2025 reports, and treatment involves UV disinfection, chlorination, and fluoridation.

Geology & Source: Catskill/Delaware and Croton watersheds; Precambrian Fordham Gneiss and Manhattan Schist with Paleozoic shales in Croton system — resistant bedrock yields soft Catskill/Delaware water; Croton adds moderate mineralization from schists and limestones,

Other New York Water Reports

Bath Beach

≈ 120–179 mg/L

🟠 Hard

Borough Park

≈ 0–60 mg/L

🟢 Soft

Fort Hamilton

≈ 120–179 mg/L

🟠 Hard

Sunset Park

≈ 120–179 mg/L

🟠 Hard

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Frequently Asked Questions

Is Dyker Heights's water safe to drink?

Yes. Dyker Heights'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 Dyker Heights?

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

The USA national average is 151 mg/L. Dyker Heights (≈ 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 Dyker Heights 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.