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City water profile

Ossining water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Ossining, New York.

Median indexed hardness

86PPM

One indexed ZIP

Range 85.6–85.6 PPM

State comparison
34 PPM below
State hardness rank
#27 of 55
Matched utilities
1
Active health records
0

City summary

What the indexed records say

Ossining has 1 published ZIP profile across Westchester County. The indexed median is 86 PPM, compared with 120 PPM across New York.

Among the 55 New Yorkcities with an indexed median, Ossining ranks #27from highest to lowest. Across all 132 state ZIP profiles, available estimates run from 7.2to 290 PPM.

Because only one ZIP is represented, the city median and range are the same local estimate. It should not be read as multiple independent samples across the community.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs
Moderately hard1 ZIP
Hard0 ZIPs
Very hard0 ZIPs

1 of 1 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
6.8 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 1Low: 0

Observation window: Jan 4, 2016 to Jun 9, 2026.

ZIP directory

Water reports in Ossining

Open a ZIP for site-level provenance and measurements.

ZIP code

10562

Moderately Hard

85.6 PPM

Nearest site
6.8 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Ossining Water Department

PWSID NY5903451

Surface water
System population served
30,000
Last reported
Jun 25, 2026

A municipal system, in-state city, and served county all agree with this Census ZCTA.

Compliance history

What EPA records show

No active health-based violation appears among the associated systems in the represented EPA reporting quarter. This does not mean every contaminant was tested at every tap.

RecordSystemPeriodStatus
TTHMNY5903451Apr 1, 2022Resolved
Total Haloacetic Acids (HAA5)NY5903451Apr 1, 2022Resolved

Practical next steps

Move from index to evidence

  1. 1. Open your ZIP. Check distance, dates, confidence, and the associated utility.
  2. 2. Read the current CCR. Confirm source water, detections, limits, ranges, and notices.
  3. 3. Test the tap when needed. Confirm health concerns or treatment sizing with the right method.

Questions people ask

About water in Ossining

Is the water hard?

The indexed city median is 86 PPM. Open the ZIP report to verify the distance and confidence behind that estimate.

Is the tap water safe?

Compliance history is utility-wide and cannot guarantee conditions at every tap. Check current notices and test when address-specific evidence is needed.

Do I need treatment?

Choose treatment only after confirming the problem at the property. A softener targets hardness; contaminant treatment requires a matching, verified performance claim.