Suffolk County and Islip Town property record for 18 William Ave, Central Islip, NY 11722
| Property Type | Single Family Home |
|---|---|
| Details | 1,270 sqft · built 1940 |
| Lot Size | 0.17 acres (7,405 sqft) |
| Owner | Individual Name on File |
| Last Sale | $313,000 (Jul 2021) |
| Tax Bill | $9,105 (2024) |
| Deeds & Mortgages | Jul 2021 Sale & Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 472889 98.-2-11 |
| Primary APN | 472889 98.-2-11 |
|---|---|
| Alternative APNs |
|
| Building Area | 1,270 sqft Living Area |
|---|---|
| 1st Floor Area | 870 sqft |
| Year Built | Built 1940 |
|---|---|
| Effective Year Built | Effective 1940 |
| Lot Area | 7,405 sqft (0.17 acres) |
| Lot Width | 80 ft Width |
| Garage Type | Detached |
| Garage Area | 294 sqft |
| Account Number | 369560 |
|---|---|
| Street Address | 18 WILLIAM AVE |
| City | CENTRAL ISLIP |
| State | NY |
| Zip | 11722-2333 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | B |
| Legal Description | X2220959Y208210 T012H00000000 |
| Legal Block | 8000 |
| Legal Lot Number | 200 |
| Jurisdiction | SUFFOLK NY |
| Township / Civil Division | ISLIP |
| Census Block Group | 2 |
| Census Block | 2025 |
| Census Tract | 145706 |
18 William Ave is owned and occupied by an individual who bought it in July 2021.
Source: Suffolk County and Islip Town records, as of August 11, 2026
| Owner of Record | Individual Name on File |
|---|---|
| Mailing Address | 18 WILLIAM AVE, CENTRAL ISLIP, NY 11722-2333 |
| 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 | Name on Deed |
|---|---|
| Last Sale | Jul 23, 2021 · Amount on File |
| Deed Sale | Jul 23, 2021 · Amount on File |
| Deed Book / Page | 13113 / 308 |
| Record Updated | Sep 20, 2026 |
| Document Type | Deed |
|---|---|
| Jurisdiction | SUFFOLK NY |
| Recording Date | Jul 23, 2021 |
| Property Address | 18 WILLIAM AVE, CENTRAL ISLIP, NY 11722-2333 |
| Document Number | 0131130308 |
| Book / Page | 13113 / 308 |
| Instrument Date | May 24, 2021 |
| Transaction Type | Transfer |
| Record Updated | Apr 3, 2026 |
| Amount | Amount on Record |
|---|---|
| Downpayment | Downpayment on Record |
| Loan-to-Value (LTV) | LTV on Record |
| Tax | $0.00 |
| Amount Accuracy | Rounded by County |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Address | 6 NOEL PL, NORTH BABYLON, NY 11703-5407 |
| Document Number | 0023304131 |
|---|---|
| Date | Jul 23, 2021 |
| Instrument | 23304/131 |
| Name | FREEDOM MORTGAGE CORP |
|---|---|
| Type | Subprime Lender |
| Type | Stand-Alone First Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 361 Months |
| Due | Aug 1, 2051 |
Source: Suffolk County and Islip Town assessment roll, as of August 11, 2026
| Type | Name |
|---|---|
| State | New York |
| County | Suffolk County |
| County Subdivision | Islip Town |
| Unified School District | Central Islip Union Free School District (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2025 | $28,400 Land $6,100 Building $22,300 | $400,000 (-) Land $85,915 Building $314,085 | |
| 2024 | $9,105.00 | $400,000 (+2.54%) Land $85,915 Building $314,085 | |
| 2023 | $28,400 Land $6,100 Building $22,300 | $390,110 Land $83,791 Building $306,319 |
Assessed value and assessed market value are set for property tax purposes, not market price estimates; both are a fraction of this property's market value.
FEMA maps place 18 William Ave in Zone X, an area of minimal flood risk.
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 | 2 in force |
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.
Wildfire risk around 18 William Ave is low, with less than a 0.01% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 99.1% of the US · lower than 99.2% of New York |
|---|---|
| Wildfire Likelihood | Under 0.01% annual chance |
| Exposure | None beyond 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 | SUFFOLK COUNTY WATER AUTHORITY serves 1,100,000 people · EPA ID NY5110526 |
|---|---|
| Water Source | Groundwater |
| Last State Inspection | Jan 2024 |
| Lead | 1 ppb (2025–2027) action level 15 ppb |
| Water Quality | Asbestos resolved · Jul 2020 |
|---|---|
| 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 512 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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