COUNTY REPORT NY

Westchester County, New York

86 ZIP codes · Avg score 95/100 · Grade A

ZipCheckup grade for Westchester County: A.

Checked records flag no major concern; missing data is unknown.

Across Westchester County, ZIP-level Home Safety Scores average out to a grade in the top two bands; the page tracks 86 ZIP codes in all.

How Westchester County Compares

Westchester County95/100
New York avg84/100
National avg73/100

How Westchester County Compares

A
County Grade
95/100
Avg Safety Score
86
ZIP Codes
56
Water Systems

Westchester County scores 11 points above the New York state average (84/100) and 22 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

A
County Grade
95
Avg Safety Score
86
ZIP Codes
Hartsdale
Best ZIP: 10530 (100/100)
Somers
Lowest ZIP: 10589 (67/100)
$669K
Median Home Value
$600
Avg Remediation (0.09% 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%)

Modeled additional annual cost estimate per homeowner: $4,443, largest modeled factor: Sea Level

78% of homes built before 1980 (lead paint was banned for residential use in 1978)

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
78%
Pre-1980 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 DWINSA infrastructure needs, EPA SDWIS violations, and EPA lead indicators.

Compound Risk Breakdown

Estimated additional annual cost per homeowner: $4,443

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
$600
Est. Remediation Cost
0.1%
of Home Value
Remediation as % of home value low burden

Modeled remediation costs in Westchester County can be compared with the median property value; actual costs vary by property.

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 mapped to Westchester County ZIP codes

8 community water systems mapped to Westchester County ZIP codes; EPA may list more systems serving the county.

Show all 8 water systems

56 water systems mapped to Westchester County ZIP codes in our data; EPA may list more systems serving the county.

Systems with the most violations in Westchester County

5 water systems with violations in EPA records.

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

Recommended Buyer Guides for Westchester County

Selection follows a fixed set of rules applied to local records: signals such as PFAS detections, lead action-level exceedances on record, a large share of pre-1978 housing, EPA Radon Zone 1, or a top flood or wildfire risk each add a related guide, and when none applies, general water testing and filtration guides are shown instead.

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 (95/100) across 52 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 an average Home Safety grade of A from its scored ZIP records (86 ZIP codes tracked); this is a composite index, not a tap-water test.
How many water systems serve Westchester County?
We map 56 public water systems to 86 ZIP codes in our data for Westchester County. EPA may list more systems serving the county, so this is not a full count.
What is the biggest environmental risk in Westchester County?
In ZipCheckup's cost model, the factor with the largest estimated average annual cost in Westchester County is sea level. Across all modeled risk factors, the estimated average additional annual cost is $4,443 per homeowner; actual costs vary by home.
How old are homes in Westchester County?
The median home build year in Westchester County is 1958. 78% of homes were built before 1980; homes built before 1978 may contain lead-based paint, and older homes may have older plumbing materials.
How does Westchester County compare to New York?
Westchester County has an average Home Safety Score of 95/100 under model 4.0.0, which is at or above the New York state average of 84/100.

How to cite this page

APA ZipCheckup. (2026). Westchester County, NY: HSS 95/100; 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 95/100; PFAS Found in Water}},
  year   = {2026},
  url    = {https://zipcheckup.com/county/new-york/westchester/}
}

Page version: October 2026.

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