Westchester County, New York
69 ZIP codes · Avg score 79/100 · Grade B · Updated 2026-06-04
Recent water monitoring in Westchester County shows 69 ZIP codes with consistently safe results.
How Westchester County Compares
How Westchester County Compares
Westchester County scores 18 points above the New York state average (61/100) and 11 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
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.
Key Risk Factors
Health risk index: 10.5 (asthma 9.4%, diabetes 10.7%)
Estimated additional annual cost per homeowner: $4,436, driven primarily by sea_level
Infrastructure: 0.49% avg pipe failure probability, 70% of ZIPs at high risk
79.9% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
↑ Worsening trendEPA violation counts by year across Westchester County water systems. Health-based shown in red, total in blue.
Peak year: 2025 with 79 violations. Past 5 years: 229 total (229 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
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Infrastructure Overview
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $4,436
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
346,727 housing units in Westchester County
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
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
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 5 systems in Westchester County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Old Post Road Water District | 1,500 | 92 |
| 2 | Bedford Consolidated W.d. | 9,056 | 75 |
| 3 | Khal Adas Kashau | 650 | 62 |
| 4 | North Castle Water District #2 | 1,200 | 58 |
| 5 | Harvey School | 510 | 54 |
89 total water systems serve Westchester County.
All ZIP Codes in Westchester County
69 ZIP codes tracked in Westchester County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 10551 | Mount Vernon | 99 | A | 0 | — |
| 2 | 10557 | Mount Vernon | 99 | A | 0 | — |
| 3 | 10602 | White Plains | 97 | A | 5 | — |
| 4 | 10610 | White Plains | 97 | A | 5 | — |
| 5 | 10511 | Buchanan | 95 | A | 0 | $492K |
| 6 | 10526 | Goldens Bridge | 95 | A | 0 | $795K |
| 7 | 10571 | Pleasantville | 94 | A | 5 (1 health) | — |
| 8 | 10572 | Pleasantville | 94 | A | 5 (1 health) | — |
| 9 | 10519 | Croton Falls | 93 | A | 1 | — |
| 10 | 10702 | Yonkers | 92 | A | 0 | — |
| 11 | 10522 | Dobbs Ferry | 90 | A | 0 | $719K |
| 12 | 10550 | Mount Vernon | 90 | A | 0 | $483K |
| 13 | 10552 | Mount Vernon | 90 | A | 0 | $331K |
| 14 | 10553 | Mount Vernon | 90 | A | 0 | $490K |
| 15 | 10588 | Shrub Oak | 90 | A | 0 | $522K |
| 16 | 10566 | Peekskill | 89 | A | 2 | $377K |
| 17 | 10591 | Tarrytown | 88 | A | 4 (2 health) | $662K |
| 18 | 10601 | White Plains | 88 | A | 5 | $397K |
| 19 | 10606 | White Plains | 88 | A | 5 | $668K |
| 20 | 10590 | South Salem | 87 | A | 3 (1 health) | $728K |
| 21 | 10533 | Irvington | 85 | A | 0 | $908K |
| 22 | 10567 | Cortlandt Manor | 85 | A | 0 | $533K |
| 23 | 10704 | Yonkers | 85 | A | 0 | $508K |
| 24 | 10802 | New Rochelle | 85 | A | 10 (5 health) | — |
| 25 | 10510 | Briarcliff Manor | 84 | B | 1 (1 health) | $843K |
| 26 | 10707 | Tuckahoe | 84 | B | 2 | $718K |
| 27 | 10603 | White Plains | 83 | B | 5 | $500K |
| 28 | 10605 | White Plains | 83 | B | 5 | $761K |
| 29 | 10607 | White Plains | 83 | B | 5 | $624K |
| 30 | 11054 | Port Washington | 83 | B | 3 (3 health) | — |
| 31 | 10514 | Chappaqua | 82 | B | 4 | $1069K |
| 32 | 10540 | Lincolndale | 81 | B | 1 | — |
| 33 | 10549 | Mount Kisco | 81 | B | 1 (1 health) | $653K |
| 34 | 10570 | Pleasantville | 81 | B | 5 (1 health) | $862K |
| 35 | 10538 | Larchmont | 80 | B | 1 | $1185K |
| 36 | 10583 | Scarsdale | 80 | B | 0 | $1132K |
| 37 | 10598 | Yorktown Heights | 80 | B | 5 (2 health) | $591K |
| 38 | 10701 | Yonkers | 80 | B | 0 | $413K |
| 39 | 10705 | Yonkers | 80 | B | 0 | $446K |
| 40 | 10710 | Yonkers | 80 | B | 0 | $534K |
| 41 | 10523 | Elmsford | 79 | B | 33 (1 health) | $526K |
| 42 | 10543 | Mamaroneck | 75 | B | 0 | $710K |
| 43 | 10703 | Yonkers | 75 | B | 0 | $478K |
| 44 | 10805 | New Rochelle | 74 | B | 10 (5 health) | $338K |
| 45 | 10470 | Bronx | 73 | B | 0 | $500K |
| 46 | 10505 | Baldwin Place | 73 | B | 0 | $860K |
| 47 | 10546 | Millwood | 73 | B | 0 | $832K |
| 48 | 10548 | Montrose | 73 | B | 0 | $446K |
| 49 | 10587 | Shenorock | 73 | B | 0 | — |
| 50 | 10596 | Verplanck | 73 | B | 0 | $449K |
| 51 | 10597 | Waccabuc | 73 | B | 0 | $1108K |
| 52 | 10801 | New Rochelle | 69 | C | 10 (5 health) | $555K |
| 53 | 10804 | New Rochelle | 69 | C | 10 (5 health) | $894K |
| 54 | 10562 | Ossining | 68 | C | 14 (5 health) | $487K |
| 55 | 10517 | Crompond | 66 | C | 0 | $598K |
| 56 | 10518 | Cross River | 66 | C | 0 | $796K |
| 57 | 10521 | Croton On Hudson | 66 | C | 0 | — |
| 58 | 10471 | Bronx | 65 | C | 0 | $407K |
| 59 | 10506 | Bedford | 65 | C | 37 (33 health) | $1098K |
| 60 | 10507 | Bedford Hills | 65 | C | 20 (19 health) | $629K |
| 61 | 10520 | Croton On Hudson | 65 | C | 0 | $670K |
| 62 | 10536 | Katonah | 65 | C | 17 (14 health) | $854K |
| 63 | 10560 | North Salem | 65 | C | 33 (20 health) | $657K |
| 64 | 10576 | Pound Ridge | 65 | C | 0 | $1015K |
| 65 | 10589 | Somers | 64 | C | 21 (11 health) | $521K |
| 66 | 10504 | Armonk | 60 | C | 21 (17 health) | $1151K |
| 67 | 10595 | Valhalla | 58 | C | 8 (8 health) | $725K |
| 68 | 10528 | Harrison | 55 | C | 0 | $934K |
| 69 | 10580 | Rye | 50 | D | 0 | $1834K |
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.
- Best Lead Paint Test Kits — 79.9% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Westchester County, New York
Overview
Westchester County in New York covers 69 ZIP codes with an average Home Safety Score of B (79/100).
35 of 69 ZIP codes have recorded EPA violations. 161 health-based violations have been documented.
← Back to New York water quality report
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Updated daily.