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

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

Flatbush 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

250.5 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 Flatbush, your appliances are currently losing 4% efficiency due to mineral buildup.

Appliance	In Flatbush	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 Flatbush compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Flatbush, New York	≈ 0–59 mg/L	5.8 ppt	🟢 Soft	reservoir
Brooklyn, New York	≈ 60–120 mg/L	5 ppt	🟡 Moderately Hard	groundwater
Kensington, New York	≈ 0–60 mg/L	7.3 ppt	🟢 Soft	reservoir
East Flatbush, New York	≈ 0–60 mg/L	8 ppt	🟢 Soft	reservoir
Park Slope, New York	≈ 0–60 mg/L	6.4 ppt	🟢 Soft	reservoir

National Benchmark

How Flatbush compares to the USA average

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

Local geology and source profile

Source: ReservoirTDS: 250.5 mg/LpH: 7.8

The New York City Department of Environmental Protection (DEP) supplies water to Flatbush, a neighborhood in Brooklyn, New York City. Flatbush receives water from the Catskill/Delaware and Croton watersheds — a system of 19 reservoirs and three controlled lakes spanning Ulster, Greene, Delaware, Putnam, and Westchester counties. Key infrastructure includes the Catskill Aqueduct, Delaware Aqueduct, and Croton Aqueduct, delivering water to distribution points such as Hillview Reservoir in Yonkers. Treatment includes UV disinfection at the Croton system, sedimentation and filtration where needed, and final chloramination before distribution to over 8 million residents across the five boroughs.

The Catskill/Delaware and Croton watersheds cover more than 2,000 square miles of protected forested land, featuring reservoirs including Ashokan, Schoharie, Kensico, and New Croton Lake. Underlying geology consists of Devonian-period Appalachian bedrock dominated by non-carbonate shales and sandstones of the Catskill and Helderberg groups, with only minor limestone outcrops. Water percolates through thin soils and fractured rock, undergoing natural filtration with minimal mineral leaching — resulting in characteristically soft water with low dissolved calcium and magnesium typical of these upstate New York highlands.

As soft water, Flatbush's supply causes minimal scale buildup in pipes, water heaters, dishwashers, and washing machines, extending appliance life and reducing energy costs. Soap and detergents lather efficiently, benefiting skin and hair without excessive dryness. No water softener is needed or recommended; focus instead on regular filter changes for sediment or chlorine taste. NYC DEP conducts over 600,000 tests annually, meeting EPA and NYSDOH standards with full lead and copper compliance via corrosion control. Disinfection uses chloramine, minimizing byproducts; no PFAS exceedances are reported. Residents in pre-1986 buildings can request free DEP lead testing kits.

Geology & Source: Catskill/Delaware and Croton watersheds; Paleozoic Devonian and Silurian shales and sandstones of the Catskill and Helderberg groups; thin soils and fractured bedrock limit carbonate contact — characteristically soft water

Other New York Water Reports

Brooklyn

≈ 60–120 mg/L

🟡 Moderately Hard

Kensington

≈ 0–60 mg/L

🟢 Soft

East Flatbush

≈ 0–60 mg/L

🟢 Soft

Park Slope

≈ 0–60 mg/L

🟢 Soft

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Frequently Asked Questions

Is Flatbush's water safe to drink?

Yes. Flatbush'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 Flatbush?

Flatbush'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 Flatbush compare to the USA average?

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