COUNTY REPORT NY

Westchester County, New York

86 ZIP codes · Avg score 94/100 · Grade A · Updated

ZipCheckup grade for Westchester County: A.

No federal data flags a major home-safety concern for this ZIP.

Recent water monitoring in Westchester County shows 86 ZIP codes with consistently safe results.

How Westchester County Compares

Westchester County94/100
New York avg84/100
National avg73/100

How Westchester County Compares

A
County Grade
94/100
Avg Safety Score
86
ZIP Codes
56
Water Systems

Westchester County scores 10 points above the New York state average (84/100) and 21 points above the national average (73/100).

Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData Last verified:

A
County Grade
94
Avg Safety Score
86
ZIP Codes
Hartsdale
Best ZIP: 10530 (100/100)
Somers
Lowest ZIP: 10589 (67/100)
$669K
Median Home Value
$2,172
Avg Remediation (32% of home value)

ZIP Code Risk Map

Water Quality Map: Westchester County, New York

Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.

A B C D F

Key Risk Factors

Health risk index: 10.5 (asthma 9.3%, diabetes 10.5%)

Estimated additional annual cost per homeowner: $4,810, driven primarily by sea_level

81.3% of homes built before 1978 (lead paint era)

Violation History (2021–2025)

↑ Worsening trend

EPA violation counts by year across Westchester County water systems. Health-based shown in red, total in blue.

2021
25 (25 health)
2022
59 (59 health)
2023
29 (29 health)
2024
47 (47 health)
2025
79 (79 health)

Peak year: 2025 with 79 violations. Past 5 years: 239 total (239 health-based). Health-based violations are rising versus the prior 2-year window - worth closer monitoring.

Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.

County Health Indicators vs National Average

Asthma 9.3% (national: 8.9%)
Diabetes 10.5% (national: 10.5%)
Obesity 26% (national: 32.4%)

Black markers indicate national averages. Source: CDC PLACES, Census ACS.

Infrastructure Overview

1958
Median Build Year
81.3%
Pre-1978 Housing
58/100
Infrastructure Stress Indicator
98%
ZIPs with High Infrastructure Stress
High
Lead Pipe Risk

Modeled area-level indicator, not a failure probability. Sources: Census ACS housing age, EPA DWINS infrastructure needs, EPA SDWIS violations, and EPA lead indicators.

Compound Risk Breakdown

Estimated additional annual cost per homeowner: $4,810

Sea Level Rise $2,395/yr
Flood $1,510/yr
Energy Code Gap $549/yr

Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).

Housing Age Distribution

389,714 housing units in Westchester County

Pre-1940 29%
1940–1959 26%
1960–1979 23%
1980–1999 13%
2000+ 9%

Source: U.S. Census Bureau ACS B25034 (Year Structure Built).

Water Safety Affordability

How much it costs to fix water issues relative to home values in Westchester County

$669K
Median Home Value
$2,172
Est. Remediation Cost
0.3%
of Home Value
Remediation as % of home value low burden

Remediation costs are relatively manageable for most homeowners in Westchester County, representing a small fraction of property value.

Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.

Health Outcomes vs National Average

CDC PLACES data for Westchester County residents

Asthma 9.3% (US avg: 8.9%)
Diabetes 10.5% (US avg: 11%)
Obesity 26% (US avg: 32.4%)

Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.

Water systems serving Westchester County

8 community water systems serving Westchester County.

Show all 8 water systems

56 total water systems serve Westchester County.

Systems with the most violations in Westchester County

5 water systems with recorded EPA violations.

All ZIP Codes in Westchester County

86 ZIP codes tracked in Westchester County.

# ZIP Code City Safety Score Grade Violations Home Value
1 10530 Hartsdale 100 A 0 $446K
2 10546 Millwood 100 A 0 $832K
3 10550 Mount Vernon 100 A 0 $483K
4 10553 Mount Vernon 100 A 0 $490K
5 10577 Purchase 100 A 0 $1461K
6 10603 White Plains 100 A 1 $500K
7 10606 White Plains 100 A 0 $668K
8 10703 Yonkers 100 A 0 $478K
9 10704 Yonkers 100 A 0 $508K
10 10705 Yonkers 100 A 0 $446K
11 10710 Yonkers 100 A 0 $534K
12 10502 Ardsley 99 A 2 $819K
13 10522 Dobbs Ferry 99 A 2 $719K
14 10523 Elmsford 99 A 2 $526K
15 10538 Larchmont 99 A 4 $1185K
16 10552 Mount Vernon 99 A 2 $331K
17 10567 Cortlandt Manor 99 A 3 (1 health) $533K
18 10583 Scarsdale 99 A 2 $1132K
19 10604 West Harrison 99 A 3 $815K
20 10607 White Plains 99 A 2 $624K
21 10701 Yonkers 99 A 2 $413K
22 10706 Hastings On Hudson 99 A 2 $866K
23 10707 Tuckahoe 99 A 2 $718K
24 10708 Bronxville 99 A 2 $497K
25 10709 Eastchester 99 A 2 $844K
26 10801 New Rochelle 99 A 2 $555K
27 10803 Pelham 99 A 2 $961K
28 10804 New Rochelle 99 A 2 $894K
29 10805 New Rochelle 99 A 2 $338K
30 10510 Briarcliff Manor 98 A 5 $843K
31 10520 Croton On Hudson 98 A 3 (1 health) $670K
32 10533 Irvington 97 A 5 (3 health) $908K
33 10594 Thornwood 97 A 6 (4 health) $684K
34 10532 Hawthorne 96 A 7 (4 health) $675K
35 10570 Pleasantville 96 A 7 (4 health) $862K
36 10591 Tarrytown 96 A 10 (3 health) $662K
37 10595 Valhalla 94 A 11 (6 health) $725K
38 10566 Peekskill 93 A 20 $377K
39 10507 Bedford Hills 83 B 0 $629K
40 10560 North Salem 83 B 0 $657K
41 10573 Port Chester 83 B 2 $650K
42 10580 Rye 83 B 2 $1834K
43 10535 Jefferson Valley 82 B 2 (1 health) $333K
44 10547 Mohegan Lake 82 B 2 (1 health) $479K
45 10549 Mount Kisco 82 B 3 (2 health) $653K
46 10562 Ossining 82 B 4 (1 health) $487K
47 10588 Shrub Oak 82 B 2 (1 health) $522K
48 10598 Yorktown Heights 82 B 6 (1 health) $591K
49 10536 Katonah 80 B 13 $854K
50 10589 Somers 67 C 68 $521K
51 10501 Amawalk — — 0 $802K
52 10503 Ardsley On Hudson — — $678K
53 10504 Armonk — — 0 $1151K
54 10505 Baldwin Place — — 0 $860K
55 10506 Bedford — — 0 $1098K
56 10511 Buchanan — — 0 $492K
57 10514 Chappaqua — — 11 (9 health) $1069K
58 10517 Crompond — — 0 $598K
59 10518 Cross River — — 2 $796K
60 10519 Croton Falls — — —
61 10521 Croton On Hudson — — —
62 10526 Goldens Bridge — — 11 $795K
63 10527 Granite Springs — — 2 (1 health) $778K
64 10528 Harrison — — 2 $934K
65 10537 Lake Peekskill — — 1 $368K
66 10540 Lincolndale — — 0 —
67 10543 Mamaroneck — — 0 $710K
68 10545 Maryknoll — — 2 —
69 10548 Montrose — — 0 $446K
70 10551 Mount Vernon — — —
71 10557 Mount Vernon — — —
72 10571 Pleasantville — — —
73 10572 Pleasantville — — —
74 10576 Pound Ridge — — 0 $1015K
75 10578 Purdys — — $608K
76 10587 Shenorock — — —
77 10590 South Salem — — 12 (3 health) $728K
78 10596 Verplanck — — 0 $449K
79 10597 Waccabuc — — 2 $1108K
80 10601 White Plains — — 0 $397K
81 10602 White Plains — — —
82 10605 White Plains — — 0 $761K
83 10610 White Plains — — —
84 10702 Yonkers — — —
85 10802 New Rochelle — — —
86 11054 Port Washington — — —

Recommended Buyer Guides for Westchester County

Editorial methodology pairs each documented risk in this county with the buyer category that addresses it, drawing on water-quality detections, housing-stock lead exposure, EPA Radon Zone designation, and FEMA flood and wildfire ratings. NSF-certified options surface where applicable, and products that match the specific contaminant take priority.

Deep Dive Reports

Detailed analysis for Westchester County, New York

Overview

Westchester County in New York covers 86 tracked ZIP records with an average Home Safety Score of A (94/100) across 50 scored records.

47 of 72 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 18 health-based violations appear in the available health breakdown.

← Back to New York Home Safety Profile

Data Sources

Reporting periods vary by source. Missing data is shown as unavailable, not as zero.

Frequently Asked Questions

Is water safe in Westchester County?
Westchester County receives a grade of A, indicating generally safe tap water across its 86 ZIP codes.
How many water systems serve Westchester County?
Westchester County is served by 56 public water systems that supply drinking water to residents across 86 ZIP codes.
What is the biggest environmental risk in Westchester County?
The primary environmental risk factor in Westchester County is sea_level. This contributes to an estimated additional annual cost of $4,810 per homeowner.
How old are homes in Westchester County?
The median home build year in Westchester County is 1958. 81.3% of homes were built before 1978, which means they may contain lead-based paint and older plumbing materials.
How does Westchester County compare to New York?
Westchester County has an average Home Safety Score of 94/100 under model 4.0.0, which is above the New York state average of 84/100.

How to cite this page

APA ZipCheckup. (2026). Westchester County, NY: HSS 94/100; PFAS Found in Water. https://zipcheckup.com/county/new-york/westchester/
BibTeX 
@misc{zipcheckup-county-new-york-westchester,
  author = {{ZipCheckup}},
  title  = {{Westchester County, NY: HSS 94/100; PFAS Found in Water}},
  year   = {2026},
  url    = {https://zipcheckup.com/county/new-york/westchester/}
}

Page version: August 2026.

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