Hampden County, Massachusetts property research

Official MassGIS snapshot retrieved 2026-09-23. Assessment fiscal year is retained per record and varies by municipality; retrieval does not certify current ownership. Snapshot parcel_id contains source OBJECTID and is not a persistent cross-vintage identifier. Town, assessment-property, LOC_ID and map-parcel identifiers are retained for reviewed joins.

Attribution: MassGIS (Bureau of Geographic Information), Commonwealth of Massachusetts EOTSS; originating municipal assessors
Source: https://www.mass.gov/info-details/massgis-data-property-tax-parcels
Reuse: MassGIS states publicly funded data are in the public domain and may be used for any purpose.
https://www.mass.gov/info-details/massgis-frequently-asked-questions

These are dated research files, curated from public source facts. Ownership is an assessor entry, not verified legal title or a statement that a property is for sale. Source and import dates differ; September 2026 enrichment does not refresh the underlying assessment or ownership record.

GEOGRAPHY: Every retained valid parcel's representative point is tested against the official Census ACS 2024 county boundary with a 100-meter boundary tolerance. Valid source geometry is preserved. Where explicitly documented in GEOMETRY RECOVERY below, exact duplicate rings may be removed with the original geometry retained as evidence. Unrecoverable geometry receives null analytical results. Parcel record count describes the imported selection, not a guarantee of all current parcels. Distinct identifiers are retained even when geometries overlap (for example condominium interests).

FLOOD: Full valid parcel polygons intersect official FEMA NFHL flood-hazard polygons. Union areas avoid double counting; intersections smaller than one square meter are omitted. Percentages use the full parcel area as denominator, with coverage recorded separately. Special Flood Hazard Area means SFHA_TF=T. Coverage below 99.9% leaves an unknown remainder, not a negative flood finding. Zone X and zero mapped SFHA do not certify freedom from flooding. This is screening data, not a flood certificate, survey, insurance recommendation or engineering opinion.

SCHOOLS: NCES 2024-25 physical active public-school points and Census ACS 2024 unified-school districts. Nearest school is shortest parcel-to-point straight-line distance among retrieved physical schools in the state. It does not determine attendance eligibility, walking distance or school quality. Verify enrollment with the district.

ZONING: Where present, zoning is copied from an original assessor attribute. No contemporary zoning-polygon overlay or permitted-use verification is performed for this pack. Blank means unavailable. Land use is the original tax classification, not a permitted-use conclusion. Utility service/capacity, development approval, road access, title and survey boundaries are not established by these files.

DATA HANDLING: Zero remains distinct from missing. Blank, UNKNOWN and punctuation-only address placeholders become null. Original source field names and dates are documented. Texas date_acq is acquisition date, NEVER treated as sale date. Invalid source parcel geometry is not silently repaired; invalid overlay geometries may be repaired for intersection and counts are documented. Owner names and public tax mailing addresses only; no personal phone/email enrichment or demographic profiling.

USAGE: Paid curation of nonexclusive public facts; internal business and client work are allowed. Attribution is retained. LandSight claims no exclusive rights to government facts. Seven-day correction/refund policy if delivered files fail their stated scope: dakota@landsightsolutions.com.

Projection for measured areas/distances: EPSG:26918

NATIONAL WETLANDS INVENTORY SCREENING
Source: U.S. Fish and Wildlife Service, National Wetlands Inventory, May 2026 state download. Imagery years vary and are retained per parcel; the download release or retrieval date is NOT the imagery date. NWI maps wetland and deepwater habitat using biological definitions. Mapping does not establish regulatory jurisdiction or show every wetland. No mapped overlap is not a certification that wetlands are absent.
Full valid parcel polygons are intersected with NWI polygons in their native equal-area EPSG:5070 projection. Overlap uses the union of intersections of at least one square metre. Original parcel geometry and all prior fields are preserved. Invalid parcel geometry remains analytically unknown. Project coverage is limited to the official state download footprint. Parcels extending beyond the retrieval extent are marked unknown.
nwi-evidence.ndjson retains matched NWI identifiers, codes, types and parcel overlap shares. nwi_project_coverage_pct measures retrieved digital project footprint coverage, not the accuracy or completeness of real-world wetlands. nwi_imagery_years describes the mapped project imagery and can be old. Partial mapping is explicitly flagged.
Mapped area outside SFHA counts only the FEMA-mapped portion outside SFHA. It is NOT buildable acreage and does not subtract NWI wetlands, setbacks, access constraints, easements or other restrictions. Open parcel-screening.html locally to filter the CSV without uploading it.
Source documentation: https://www.fws.gov/program/national-wetlands-inventory/data-download
Limitations: https://www.fws.gov/page/national-wetlands-inventory-frequently-asked-questions

Evidence record_id refers to the original CSV parcel_id. No parcel identifiers or original values were replaced.