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20 William Ave, Central Islip, NY 11722 Property Records

Suffolk County and Islip Town property record for 20 William Ave, Central Islip, NY 11722

Property Summary

Property TypeSingle Family Home
Lot Size0.21 acres (9,148 sqft)
Owner2 Individual Names on File
Last Sale$194,000 (Feb 2017)
Tax Bill$8,277 (2024)
Deeds & MortgagesMar 2021 Mortgage
Feb 2017 Sale & Mortgage
Flood ZoneZone X (minimal risk)
APN472889 98.-2-12

Property Details

APN / Parcel Number

Primary APN472889 98.-2-12
Alternative APNs
  • 0500-098.00-02.00-012.000
  • 288909800000020120000000
  • 472800217610
  • 369550

Exterior

Lot Area9,148 sqft (0.21 acres)
Lot Width100 ft Width

Location & Zoning

Account Number369550
Street Address20 WILLIAM AVE
CityCENTRAL ISLIP
StateNY
Zip11722-2333
Property CategoryResidential
Property TypeResidential > Single Family > Home
Local Zoning CodeB
Legal DescriptionX2221048Y208229 T012H00000000
Legal Block8000
Legal Lot Number200
JurisdictionSUFFOLK NY
Township / Civil DivisionISLIP
Census Block Group2
Census Block2025
Census Tract145706

Owner

20 William Ave is owned and occupied by two individuals who bought it in February 2017.

Source: Suffolk County and Islip Town records, as of August 11, 2026

Owner of Record2 Individual Names on File
Mailing Address20 WILLIAM AVE, CENTRAL ISLIP, NY 11722-2333
OccupancyOwner Occupied
Owner TypeIndividual
VestingJoint Tenants

Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.

Deeds, Mortgages & Sale History

DateDocument
Mar 8, 2021Deed of Trust, Mortgage · FHA Mortgage
SECRETARY HOUSING URBAN DEVELOPMENT
Feb 6, 2017Grant Deed, Transfer · FHA Mortgage
PLAZA HM MTG

Assessor's Deed Record

Deed Names2 Names on Deed
Last SaleFeb 6, 2017 · Amount on File
Deed SaleFeb 6, 2017 · Amount on File
Deed Book / Page12899 / 556
Record UpdatedSep 20, 2026

March 2021: Deed of Trust, Mortgage

Document TypeDeed of Trust
JurisdictionSUFFOLK NY
Property Address20 WILLIAM AVE, CENTRAL ISLIP, NY 11722-2333
Transaction TypeMortgage
Record UpdatedApr 13, 2021

Transferred To (Grantee/Buyer)

NameVerified Name

Mortgage

Document Number0232430113
DateMar 8, 2021
Book Page23243/113
InstrumentDL059597
Lender
NameSECRETARY HOUSING URBAN DEVELOPMENT
TypeGovernment Agency
Agreement
TypeFHA Mortgage
AmountAmount on Record
Term361 Months
DueApr 1, 2051

February 2017: Grant Deed, Transfer

Document TypeGrant Deed
JurisdictionSUFFOLK NY
Recording DateFeb 6, 2017
Property Address20 WILLIAM AVE, CENTRAL ISLIP, NY 11722-2333
Document Number0128990556
Book / Page012899 / 000556
Instrument DateDec 19, 2016
Transaction TypeTransfer
Record UpdatedJun 20, 2017
Title CompanySKYLINE TRG TITLE AGENCY

Transaction

AmountAmount on Record
DownpaymentDownpayment on Record
Loan-to-Value (LTV)LTV on Record
Tax$776.00
Amount AccuracyConfirmed
Additional
  • Arm's Length

Transferred From (Grantor/Seller)

NameVerified Name

Transferred To (Grantee/Buyer)

NameVerified Name
RelationshipJoint Tenants with Right of Survivorship
Address311 BEACH 38 ST #2 FAR ROCKAWAY NY 11690, 2, FAR ROCKAWAY, NY 11690

Mortgage

Document Number227870040
DateFeb 6, 2017
Book Page022787/000040
Lender
NamePLAZA HM MTG
TypeMortgage Company
AddressJACKSONVILLE, FL 32256
Agreement
TypeFHA Mortgage
AmountAmount on Record
Term360 Months
DueFeb 5, 2047

Tax Assessment & Valuation

Source: Suffolk County and Islip Town assessment roll, as of August 11, 2026

Property Jurisdictions

TypeName
StateNew York
CountySuffolk County
County SubdivisionIslip Town
Unified School DistrictCentral Islip Union Free School District (PK - 12)

Tax Bill & Assessment History

YearTax BillAssessed ValueAssessed Market Value
2025$25,650 Land $6,900 Building $18,750$361,268 (-) Land $97,183 Building $264,085
2024$8,277.00$361,268 (+2.54%) Land $97,183 Building $264,085
2023$25,650 Land $6,900 Building $18,750$352,335 Land $94,780 Building $257,555

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.

Flood

FEMA maps place 20 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 ZoneZone X
minimal risk
Flood Insurance RequirementNot required
lenders may require it
Nearby Flood Policies2 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

Wildfire risk around 20 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 RiskLow
lower than 99.1% of the US · lower than 99.2% of New York
Wildfire LikelihoodUnder 0.01% annual chance
ExposureNone
beyond ember reach

Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.

Drinking Water

Source: EPA Safe Drinking Water Information System, as of September 2026

Water SystemSUFFOLK COUNTY WATER AUTHORITY
serves 1,100,000 people · EPA ID NY5110526
Water SourceGroundwater
Last State InspectionJan 2024
Lead1 ppb (2025–2027)
action level 15 ppb

Violations Reported to EPA

Water QualityAsbestos
resolved · Jul 2020
Treatment and ProcedureNone
last 10 years
Monitoring and ReportingNone
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.

Internet Providers

Source: FCC Broadband Data Collection, based on 512 locations within half a mile, as of December 31, 2025

ProviderMax 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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