How does Port Chester's water compare to the national average?

The USA national average is 151 mg/L. Port Chester (82 mg/L) is 69 mg/L softer than average.

Port Chester Water Hardness & Quality Report (2026)

Water Hardness

82mg/L

Moderately Hard

4.8 grains per gallon

Source

reservoir

pH Level

8.2

neutral = 7.0

Lead

0.002 mg/L

✓ Below action level

TDS

138.5 mg/L

Est. Daily Cost

$0.22

energy & soap waste

Source: See methodology section below · Updated 2026

82mg/L as CaCO₃Moderately Hard

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 Port Chester, your appliances are currently losing 11% efficiency due to mineral buildup.

Appliance	In Port Chester	Soft Water City	Efficiency Loss
Kettle	7.6 yrs	8.5 yrs	-11%
Washing Machine	10.7 yrs	12 yrs	-11%
Water Heater	13.4 yrs	15 yrs	-11%

Regional Water Comparison

How Port Chester compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Port Chester, New York	82 mg/L	4 ppt	🟡 Moderately Hard	reservoir
Rye, New York	≈ 120–179 mg/L	4.2 ppt	🟠 Hard	reservoir
Greenwich, Connecticut	68.48 mg/L	6.2 ppt	🟡 Moderately Hard	groundwater
Harrison, New York	≈ 120–179 mg/L	6.1 ppt	🟠 Hard	groundwater
Mamaroneck, New York	≈ 120–179 mg/L	0 ppt	🟠 Hard	reservoir

National Benchmark

How Port Chester compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Port Chester	82 mg/L	🟡 Low
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

Bring Scarsdale-quality water to your Port Chester home

Shop water softeners on Amazon.com →

Shop Now

What Makes Port Chester's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 138.5 mg/LpH: 8.2

Port Chester, NY, is served by Aquarion Water Company of Connecticut - Main System, a private utility providing water to approximately 351,756 people across parts of Westchester County, NY, and Fairfield County, CT. The system sources water primarily from surface supplies in the Byram River and Cross River watersheds, supplemented by groundwater wells. Key intake points include Blind Brook at Port Chester (USGS-01299030), with treatment at Aquarion facilities employing filtration, disinfection, and corrosion control.

The watershed encompasses the forested uplands of the Croton and Byram sub-basins within the larger Hudson River Basin, underlain by Precambrian gneiss, schist, and minor limestone formations of the Manhattan Prong geological province. These low-carbonate, crystalline rocks yield a moderately mineralised water character, with glacial deposits adding trace hardness ions during recharge. The geology produces a supply that is neither extremely soft nor aggressively hard, shaped by acidic rainfall percolating through thin soils into fractured bedrock aquifers.

At moderately hard levels, Port Chester water causes moderate scale buildup in dishwashers, washing machines, and water heaters, leaving spots on glassware over time. Annual descaling and vinegar rinses benefit affected appliances. A water softener is recommended for households with hard water concerns, though not essential for all users given the softer regional profile. The water meets EPA legal limits with zero MCL violations; two contaminants exceed health-based guidelines (MCLGs), prompting filter recommendations for PFAS and disinfection byproducts such as trihalomethanes and haloacetic acids from chlorination of organic matter.

Geology & Source: Byram River and Blind Brook watershed in Hudson River Basin; Precambrian gneiss, schist, and minor limestone of the Manhattan Prong geological province — low-carbonate crystalline rocks yield moderate hardness; glacial till adds trace ions

Other New York Water Reports

Rye

≈ 120–179 mg/L

🟠 Hard

Greenwich

68.48 mg/L

🟡 Moderately Hard

Harrison

≈ 120–179 mg/L

🟠 Hard

Mamaroneck

≈ 120–179 mg/L

🟠 Hard

Report an Issue

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 Port Chester's water safe to drink?

Yes. Port Chester's water meets all federal safety standards. The hardness is 82 mg/L (Moderately Hard), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Port Chester?

Port Chester's water is moderately hard at 82 mg/L. A water softener is generally not necessary, though a carbon filter can improve taste and remove any remaining chlorine.

How does Port Chester compare to the USA average?

The USA national average is 151 mg/L. Port Chester (82 mg/L) is 69 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 Port Chester 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.