How does Flatlands's water compare to the national average?

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

Flatlands Water Hardness & Quality Report (2026)

Water Hardness

soft

~0–59 mg/L

Soft

estimated · not lab-verified

Source

reservoir

pH Level

7.8

neutral = 7.0

Lead

0.005 mg/L

✓ Below action level

TDS

252.1 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 Flatlands, your appliances are currently losing 4% efficiency due to mineral buildup.

Appliance	In Flatlands	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 Flatlands compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Flatlands, New York	≈ 0–59 mg/L	5.8 ppt	🟢 Soft	reservoir
Bergen Beach, New York	≈ 120–179 mg/L	4.1 ppt	🟠 Hard	groundwater
Sheepshead Bay, New York	≈ 120–179 mg/L	5.4 ppt	🟠 Hard	reservoir
Brooklyn, New York	≈ 60–120 mg/L	5 ppt	🟡 Moderately Hard	groundwater
East Flatbush, New York	≈ 0–60 mg/L	8 ppt	🟢 Soft	reservoir

National Benchmark

How Flatlands compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Flatlands	≈ 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 Flatlands's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 252.1 mg/LpH: 7.8

Flatlands, a neighborhood in Brooklyn (Kings County), is served by the New York City Department of Environmental Protection (DEP), supplying over 8 million residents across the five boroughs. Water is sourced from 19 reservoirs and three controlled lakes in the Catskill/Delaware and Croton systems upstate, delivered via aqueducts to treatment facilities including the Catskill, Delaware, and Croton plants. No local treatment occurs in Flatlands; water arrives treated and pressurized through the city's extensive distribution network.

The primary Catskill/Delaware Watershed spans 2,000 square miles in the Catskill Mountains and Delaware River basin, underlain by Devonian-age shales, sandstones, and Precambrian gneisses with minimal carbonate content. The Croton Watershed features similar Paleozoic metamorphics and glacial deposits. This geology — dominated by resistant crystalline formations rather than limestone or dolomite — yields very soft water, as non-calcareous rocks limit mineral leaching through forested soils and fractured bedrock aquifers.

Soft water causes negligible scale buildup in pipes, water heaters, dishwashers, and washing machines, minimizing maintenance and extending appliance life. Soap and detergents lather efficiently, and skin is less prone to dryness. No water softener is needed or recommended. The system complies with the Lead and Copper Rule with corrosion control via pH adjustment and orthophosphate; PFAS levels are low (below 10 ppt total); treatment includes UV disinfection at Delaware/Croton plants, chlorination, and granular activated carbon testing for organics.

Geology & Source: Catskill/Delaware and Croton watersheds; Devonian shales, Precambrian gneisses and schist — non-carbonate crystalline rocks with minimal limestone; very soft water due to limited mineral dissolution

Other New York Water Reports

Bergen Beach

≈ 120–179 mg/L

🟠 Hard

Sheepshead Bay

≈ 120–179 mg/L

🟠 Hard

Brooklyn

≈ 60–120 mg/L

🟡 Moderately Hard

East Flatbush

≈ 0–60 mg/L

🟢 Soft

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All reports are reviewed by our team. Thank you for supporting data quality!

Frequently Asked Questions

Is Flatlands's water safe to drink?

Yes. Flatlands'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 Flatlands?

Flatlands'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 Flatlands compare to the USA average?

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