Westchester County and Ossining Town property record for 25 1/2 William St, Ossining, NY 10562
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 1 ba · 1,168 sqft · built 1880 |
| Lot Size | 0.05 acres (2,178 sqft) |
| Owner | 2 Individual Names on File |
| Tax Bill | $5,426 (2026) |
| Flood Zone | Zone X (minimal risk) |
| APN | 554203 97.07-4-80 |
| Primary APN | 554203 97.07-4-80 |
|---|---|
| Alternative APN |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 1 Bath |
| Total Rooms | 6 Rooms |
| Stories | 2 Stories |
| Building Area | 1,168 sqft Living Area |
| 1st Floor Area | 596 sqft |
| Year Built | Built 1880 |
|---|---|
| Effective Year Built | Effective 1880 |
| Architectural Style | Traditional |
| Exterior Material | Aluminum/Vinyl |
| Lot Area | 2,178 sqft (0.05 acres) |
| Lot Dimensions | 121 ft deep x 15 ft wide |
| Porch | Open Porch |
| Porch Area | 83 sqft |
| Heating System | Hot Water |
|---|---|
| Heating Fuel | Oil |
| Sewer | Municipal |
| Water Source | Commercial |
| Street Address | 25 1/2 WILLIAM ST |
|---|---|
| City | OSSINING |
| State | NY |
| Zip | 10562-5528 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Block | 4 |
| Legal Lot Number | 80.000 |
| Jurisdiction | WESTCHESTER NY |
| Township / Civil Division | OSSINING |
| Census Block Group | 2 |
| Census Block | 2004 |
| Census Tract | 13304 |
25 1/2 William St is owned and occupied by two individuals.
Source: Westchester County and Ossining Town records, as of October 21, 2026
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 25 WILLIAM ST, OSSINING, NY 10562-5525 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Deed Names | 2 Names on Deed |
|---|---|
| Record Updated | Oct 29, 2026 |
The 2026 property tax bill for 25 1/2 William St was $5,426 with a homeowner's exemption, down 41.8% from the year before.
Source: Westchester County and Ossining Town assessment roll, as of May 14, 2026
| Type | Name |
|---|---|
| State | New York |
| County | Westchester County |
| County Subdivision | Ossining Town |
| Municipality | Ossining Village |
| Unified School District | Ossining Union Free School District (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $5,426.00 (-41.76%) Homeowner's exemption | ||
| 2025 | $9,316.00 | $269,500 (+30.45%) Land $188,500 Building $81,000 | $269,500 (+30.45%) Land $188,500 Building $81,000 |
| 2024 | Homeowner's exemption | $206,600 (+7.38%) Land $99,700 Building $106,900 | $206,600 (+7.38%) Land $99,700 Building $106,900 |
| 2023 | $192,400 Land $99,700 Building $92,700 | $192,400 Land $99,700 Building $92,700 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 25 1/2 William St in Zone X, an area of minimal flood risk, though there have been 2 flood claims nearby since 2009.
Source: FEMA National Flood Hazard Layer, effective September 18, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Nearby Flood Policies | 1 in force |
| Nearby Flood Claims | 2 (2009–2021) |
| Claims Outside the SFHA | 2 of 2 |
| Most Recent Claim | Sep 2021 · Remnants Of Hurricane Ida |
Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.
The area around 25 1/2 William St has no burnable land within ember reach, so its wildfire risk is not rated.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Not rated no burnable land within ember reach |
|---|
Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.
Source: EPA Safe Drinking Water Information System, as of September 2026
| Water System | OSSINING WATER DEPARTMENT serves 30,000 people · EPA ID NY5903451 |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Jul 2025 |
| Lead | 3 ppb (2025) action level 15 ppb |
| Water Quality | None last 10 years |
|---|---|
| Treatment and Procedure | None last 10 years |
| Monitoring and Reporting | None last 3 years |
Results are for the whole water system, not water tested at this address; lead at the tap also depends on the building's own pipes.
Source: FCC Broadband Data Collection, based on 616 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Optimum Fiber · Cable | 8,000 / 8,000 |
| Verizon Fiber · Fixed Wireless in parts of the area | 2,300 / 2,300 |
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