Description: The Address Point file was downloaded from NYS GIS Clearinghouse at https://data.gis.ny.gov/datasets/dfa176b4cf284539812c05478dc028d2/about on May 30, 2024. The data is used for the AddressPoints Locator, as part of Enterprise Geocoding Service.
Service Item Id: d8a3f59d8a724b9d8a57e5a3f78fbb12
Copyright Text: New York State Office of Information Technology Services
Description: NYS Publication Date: May 2026This file contains 2025 parcel data only for NY State Counties which gave ITS NYS Geospatial Services permission to share this data with the public. To date, 38 counties have provided Geospatial Services permission to share their parcel data with the public. Parcel data for counties which do not allow Geospatial Services to redistribute their data must be obtained directly from those counties. Geospatial Services' goal is to eventually include parcel data for all counties in New York State. Parcel geometry was incorporated as received from County Real Property Departments. No attempt was made to edge-match parcels along adjacent counties. Attribute values were populated using 2025 Assessment Roll tabular data. Geospatial Services obtained from the NYS Department of Tax and Finance’s Office of Real Property Tax Services (ORPTS). Tabular assessment data was joined to the county provided parcel geometry using the SWIS & SBL or SWIS & PRINT KEY unique identifier for each parcel. Detailed information about assessment attributes can be found in the ORPTS Assessor’s Manuals available here: https://www.tax.ny.gov/research/property/assess/manuals/assersmanual.htm. New York City parcel data comes from NYC MapPluto: https://www.nyc.gov/content/planning/pages/resources/datasets/mappluto-pluto-changeWestchester County downloaded this data layer from NYS and only selected the parcels in Westchester County. Municipalities share their geometry with the county and we share that with NYS.
Service Item Id: d8a3f59d8a724b9d8a57e5a3f78fbb12
Copyright Text: Contributing counties, NYS Office of Information Technology Services Geospatial Services and NYS Department of Taxation and Finance’s Office of Real Property Tax Services (ORPTS).
Description: MS4 is short for "Municipal Separate Storm Sewer System". The consortium is made up of 17 municipalities within the county (note that consortium municipalities do change often). This data was collected by Dolph Rotfeld Engineering and Stellar Services. The type of drainstructure can be found in the field "Structure_WC" (alias "STRUCTURE"). It includes catch basin, culvert, draingage manhole, inlet point, open drain, outfal, other/unknown, and outfall/interconnect.It was prepared for Westchetser County Government, Department of Public Works and Transportation in 2020.Some features may be in municipalities that are non-consortium becasue of error or miscommunication on where the municipality boundaries are located (In field error).
Service Item Id: d8a3f59d8a724b9d8a57e5a3f78fbb12
Copyright Text: Dolph Rotfeld Engineering and Stellar
Description: This data is a collection of sanitary sewer manholes within Westchester County (excluding manholes on the Westchester County Trunkline). The data was initially digitized from the early 1990's Sanitary Sewer Evaluation Study (SSIS) and then augmented with more recent and up to date data from local governments where available. As of October 5, 2015 this is the most up to date version of the sewer manholes available.
Service Item Id: d8a3f59d8a724b9d8a57e5a3f78fbb12
Copyright Text: Westchester County, City of Mount Vernon, Town of Cortlandt, Village of Briarcliff Manor, Village of Buchanan, Village of Croton, Village of Irvington, Village of Larchmont, Town of Mamaroneck, Village of Mount Kisco, Town of North Castle, Village of Ossining, Village of Pleasantville, City of Rye, City of Yonkers and Town of Somers
Description: This data is a collection of sanitary sewer mains within Westchester County (excluding the Westchester County Trunkline). The data was initially digitized from the early 1990's Sanitary Sewer Evaluation Study (SSIS) and then augmented with more recent and up to date data from local governments where available. As of October 5, 2015 this is the most up to date version of the sewer mains available.
Service Item Id: d8a3f59d8a724b9d8a57e5a3f78fbb12
Copyright Text: Westchester County, City of Mount Vernon, Town of Cortlandt, Village of Briarcliff Manor, Village of Buchanan, Village of Croton, Village of Irvington, Village of Larchmont, Town of Mamaroneck, Village of Mount Kisco, Town of North Castle, Village of Ossining, Village of Pleasantville, City of Rye, City of Yonkers and Town of Somers
Description: July 2024. This point feature class shows the address locations of septic tank pump out in 2023. The location points include the tax parcel and street-level geocoding results. Data is extracted from the Digital Health pomp report database maintained by the DOIT Human and Health Services team. Watershed names have been added to the attribute table.
Service Item Id: d8a3f59d8a724b9d8a57e5a3f78fbb12
Copyright Text: Data is extracted from Digital Health pump out report database maintained by DOIT Human and Health Services team.
Description: This point feature class shows the address locations of septic tank pump out in 2022. The location points include the tax parcel and street level geocoding results. Data is extracted from Digital Health pump out report database maintained by DOIT Human and Health Services team. Watershed names have been added to the attribute table. Updated in May, 2023.
Service Item Id: d8a3f59d8a724b9d8a57e5a3f78fbb12
Copyright Text: Data is extracted from Digital Health pump out report database maintained by DOIT Human and Health Services team.
Description: April 2022. This point feature class shows the address locations of septic tank pump out in 2021. The location points include the tax parcel and street level geocoding results. Data is extracted from Digital Health pomp out report database maintained by DOIT Human and Health Services team. Watershed names have been added to the attribute table.
Service Item Id: d8a3f59d8a724b9d8a57e5a3f78fbb12
Copyright Text: Data is extracted from Digital Health pump out report database maintained by DOIT Human and Health Services team.
Description: Official NYC East-of-Hudson and West-of-Hudson reservoir drainage basin boundaries delineated from 2009 LiDAR-derived 1-meter Digital Elevation Model (DEM). The 1m DEM was derived from airborne LiDAR data collected in 2009 as part of the NYS Digital Ortho Program under contract with NYCDEP under CAT-371. This feature class can be used to mask out individual basins or groups of basins by setting the layer's Definition Query to either include or exclude certain reservoir basins. In addition to a reservoir basin name field, there is a "region" field designating basins with the EOH vs WOH watershed, to provide additional database query flexibility. The NYC Watershed is a combination of each NYC Reservoir's drainage basin area. There are 6 reservoir drainage basins on the West side of the Hudson River (WOH) and 15 basins on the East side of the Hudson (EOH). There are 3 NYC Water Supply "Systems" based on how each reservoir and aqueduct are interconnected, managed, and treated. They are: 1) Catskill System 2) Delaware System 3) Croton System In the West-of-Hudson (WOH) Watershed, the 2 "Catskill System" Basins are: 1) Ashokan 2) Schoharie In the WOH watershed, the 4 "Delaware System" basins are: 1) Neversink 2) Rondout 3) Pepacton 4) Cannonsville In the East-of-Hudson (EOH) Watershed, there are 3 basins that are considered part of the combined "Catskill/Delaware" (CAT/DEL) System: 1) West Branch 2) Boyd Corners 3) Kensico All of the 12 remaining EOH basins are in the "Croton System": 1) New Croton 2) Titicus 3) Muscoot 4) Lake Gilead 5) Lake Gleneida 6) Amawalk 7) Diverting 8) Croton Falls 9) Bog Brook 10) Middle Branch 11) East Branch 12) Cross River As part of the NYC Watershed 2009 LiDAR National Hydrography Dataset (NHD) Update Project: Reservoir and Watershed Boundary Dataset 8-digit Hydrologic Unit (8-d HU) boundaries were created by IAGT/RACNE under CAT-393 for each of the West of Hudson (WOH) Reservoirs in the Catskill Mountains. In the EOH Taconic Mountains, there is a single 8-digit HUC boundary for all of the 17 reservoirs draining into the Lower Hudson sub-watershed through the New Croton Reservoir spillway, plus another for the Kensico Reservoir. Because NYCDEP also regulates according to EOH individual reservoir basins, which are at the level of a 12-digit HUC, these EOH basins were created in-house by BWS GIS staff (D. Lounsbury/J. Tuscanes) using the same source data and methodology as the WOH basins. Polygons representing differences between this 1m product and older 1:24K-derived basins were created and manually reviewed for correctness by NYSDEP BWS GIS and ERA Wetlands staff using high resolution aerial imagery, 2 ft contours, 1m DEM hillshade, GPS-ed culvert locations, GoogleMaps drive-by imagery, and BING Birds-eye imagery. In cases where office techniques could not easily determine correctness, field visits using sub-meter GPS data collection were performed by ERA Wetlands and GIS staff to make final determination. 1m Basin data were edited as needed by BWS GIS staff based on manual review. Because original vector data contained jagged edges as a by-products of the original raster gridded elevation data, a 10m x 10m smoothing filter was run on the exterior NYC watershed boundary and interior WOH basin boundaries, while a 5m x 5m smoothing filter was run on the smaller interior EOH basins. Each smoothed line was checked to ensure any elevation summits and ridgelines were still captured and that the line was true to the original catch basin delineation. In addition, DEP staff applied a simplification process to the boundaries. Because of the slowness in speed and performance due to the amount of vertices, the simplify line tool was used to reduce the amount of vertices, resulting in an increase in drawing and processing speeds. Again, staff checked the result to ensure that accuracy was not compromised. Sections of basin edges were also snapped to reservoir spillway edges and top-of-dam lines in the "NHDLine" and Auxiliary "breakline" feature classes where appropriate. This work was performed on the subbasin product first, and then all other basin related products were created. These were the steps used:Convert NYCsubbasin1m to arcsRun “simplify line” tool (Bend Simplify, 5m) on arcsConvert arcs result to polygonsRun repair geometryCreate basin1m (and related product) from subbasins1mIAGT/RACNE methodology: A single vector line feature class was directly derived from the 1m DEM, then manually reviewed. Polygonal feature classes were then derived from the line feature class, with a topology requirement to achieve polygonal closure and no non-hydrologic polygons. Lines were produced by TauDEM flow analysis of Reference DEM (1 m, version 0). Segment review was performed using 0.5 m interval contours and 2012 Hydrographic and Topographic Breaklines as guidelines. Vector process boundaries are the raster boundaries above plus those corresponding to areas downstream of the reservoirs that drain the corresponding WBD 8-d HU. See "2D Breakline Features and Hydrography Compilation Standard and Protocol" for details on the hydrography used in the review.
Service Item Id: d8a3f59d8a724b9d8a57e5a3f78fbb12
Copyright Text: Original data (NYC outer-watershed boundary and 8-digit HUC basins) developed under NYCDEP contract CAT- 393 by RACNE. EOH basins and QA edits developed in-house by NYCDEP BWS GIS. This data packaging is owned by the New York City Department of Environmental Protection, Bureau of Water Supply, 2013.
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Description: This file contains polygon data representing service areas that are part of public water supply systems within Westchester County, New York, based upon geographic data in GIS or CAD format provided by water supply systems and integrated into a common countywide feature class in 2012. Not all areas in the county served by public water supply systems are covered, and the accuracy of the geographic representations and attributes included in this dataset is dependent upon the accuracy of the source data, which has not been independently verified by Westchester GIS .
Description: Data layer derived from sewer districts mapped by the Department of Planning in 1997. Data was updated in 2022 to reflect all of the available Board of Legislators (BOL) approved additions and take-outs to the mid of 2022 (summer). Updates also include district boundaries updates in June 2015 to conform to new Westchester County Municipal Boundaries data layer updated in 2014.
Description: Data obtained from New York State Geological Survey. For more information contact: http://www.nysm.nysed.gov/geology.html Coverage identifies only broad classifications of Surficial Geology in County.
Description: Data obtained from New York State Geological Survey. Coverage identifies only broad classifications of Surficial Geology in County. For more information contact: http://www.nysm.nysed.gov/geology.html
Description: This data represents established channel lines under Westchester County jurisdiction. County channel lines are established along entire lengths or sections of rivers and streams that are administered and maintained by County Department of Public Works.
Description: County-wide drainage basin boundaries automated (1992) from Westchester County Environmental Planning Atlas Hydrologic Features Map (1:24,000). Updated (2012) to include new sub-basins delineated in the Bronx River Basin by the Center for Watershed Protection (2007-2008).
Description: Dataset consist of statutory boundaries of Significant Coastal Fish and Wildlife Habitats (SCFWH) as identified and recommended by Environmental Conservation and designated by Department of State. All SCFWH areas are found within the federally approved Coastal Area Boundary (CAB) of New York State. Original data was hand-drawn over DOT topographic quadrangle sections and filed with local governments. Digital data set (version 1.1) was previewed by NYS DEC Habitat Inventory Unit and subsequently corrected as per their recommendations. The original digital version of the SCFWHs, Version 1.2, has been replaced with this current version 2.0. Version 2.0 includes changes/updates to the Peconic estuary (2002), north shore of Long Island (2005), the south shore of Long Island (2008), and the Hudson River (2012). Scale: 1:24000. Data was last revised by the NYS Clearinghouse Office of Planning and Development August, 2013.
The data was downloaded from the New York State GIS Clearinghouse September 2015.
Description: This data layer represents a compilation of local zoning districts and is based on zoning information compiled and digitized from each of Westchester's 43 municipalities between 2011 and 2024. It is important to note that it is not an officially adopted map of local zoning, but rather a depiction - or "snapshot" - of local zoning at the time of compilation. As such, this data layer is intended to be used for general reference purposes only. Since local zoning is constantly subject to change, inquiries regarding current status of local zoning districts, zoning designations of specific parcels, and exact use and bulk requirements should be verified at the local level by contacting the local planning or municipal clerk’s office. Selected updates were completed for this data layer in 2015 and 2016 for the municipalities of Rye City, Town of North Castle, Village of Mamaroneck and Port Chester. Updates for the City of Mount Vernon were completed in April 2021. In 2022/2023 Westchester County conducted an outreach project to obtain updated data. The following municipalities were updated during this time: Ardsley, Dobbs Ferry, Greenburgh, Lewisboro, Mount Pleasant, North Salem, New Castle, Village of Ossining, and Peekskill. Updates for Briarcliff Manor and Buchanan were made in 2024. Buchanan has one overlay district which is an exception because no other polygons should be overlapping.
Service Item Id: d8a3f59d8a724b9d8a57e5a3f78fbb12
Copyright Text: Westchester County Department of Planning
Description: This data layer shows the locations of active petroleum bulk stograge locations in Westchester County current to June 2017. the data was extractted from Digital health database maintianed by DOIT HHS (Health and Human Services)team and was delivered to GIS on June 9th 2017.
The [Grade] attribute interpritation indicate different levels of spacial accuracy:
A- The address locacition is matched to an exact parcel centriod.
B- The address location is matched to the calculated street centerline location based on the address range.
C- Athe address location is matched to the zip code centroid.
Service Item Id: d8a3f59d8a724b9d8a57e5a3f78fbb12
Copyright Text: The data was extractted from Digital health database maintianed by DOIT HHS (Health and Human Services) team and was delivered to GIS on June 9th 2017.
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Description: This data set is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil Survey. The information was prepared by digitizing maps, by compiling information onto a planimetric correct base and digitizing, or by revising digitized maps using remotely sensed and other information. This data set consists of georeferenced digital map data and computerized attribute data. The map data are in a soil survey area extent format and include a detailed, field verified inventory of soils and miscellaneous areas that normally occur in a repeatable pattern on the landscape and that can be cartographically shown at the scale mapped. A special soil features layer (point and line features) is optional. This layer displays the location of features too small to delineate at the mapping scale, but they are large enough and contrasting enough to significantly influence use and management. The soil map units are linked to attributes in the National Soil Information System relational database, which gives the proportionate extent of the component soils and their properties. Data was downloaded Oct 2023 from U.S. Department of Agriculture, Natural Resources Conservation Service. Last Updated 2023. Use this link (https://www.nrcs.usda.gov/publications/Map%20Unit%20Description%20%28Brief%2C%20Generated%29%20Query%20by%20Soil%20Survey%20Area%20and%20Map%20Unit%20%28All%20Components%29.html) to look up the soil key descriptions (enter New York and Westchester, then find the key ID)
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Description: This layer illustrates an area of Westchester County that may be particularly vulnerable to the impact of coastal storms, including: storm surge, coastal flooding and wind hazards. Hazard potential associated with rainfall flooding is not considered. The boundaries of this zone were developed by Westchester County in cooperation with local municipal officials to promote community emergency planning and preparedness.
Description: The dataset consists of aquifer polygons or regions depicting unconsolidated aquifers in New York State, excluding Long Island. Aquifers are separated by and include attributes for potential yield ranges and confinement indicator. Edition 2.0 of this data includes 38 aquifer polygons missing from edition 1.0.
The data are those in upstate NY that consist of sand and gravel and yield large supplies of water to wells. Bedrock aquifers, although significant in some areas, are not addressed here. Source data is 1:250,000, same scale as the NYS Geological Survey surficial and bedrock geology maps on which they were based. Together these maps form a consistent set of geologic and groundwater maps for use in regional management of the groundwater resources of the State. Aquifers are separated by and include attributes for potential yield ranges and confinement indicator. Edition 2.0 of this data includes 38 aquifer polygons missing from edition 1.0 The data is from 2008, which is the latest available update from the New York State GIS Clearinghouse
Service Item Id: d8a3f59d8a724b9d8a57e5a3f78fbb12
Copyright Text: New York State Department of Environmental Conservation, Division of Water, Bureau of Water Resources Management
Description: The Digital Flood Insurance Rate Map (DFIRM) Database depicts flood risk information and supporting data used to develop the risk data. The primary risk classifications used are the 1-percent-annual-chance flood event, the 0.2-percent-annual-chance flood event, and areas of minimal flood risk. The DFIRM Database is derived from Flood Insurance Studies (FISs), previously published Flood Insurance Rate Maps (FIRMs), flood hazard analyses performed in support of the FISs and FIRMs, and new mapping data, where available. The FISs and FIRMs are published by the Federal Emergency Management Agency (FEMA). The file is georeferenced to earth's surface using the UTM projection and coordinate system.The specifications for the horizontal control of DFIRM data files are consistent with those required for mapping at a scale of 1:12,000.
Description: Hydric Soils derived from soils database (WCSOIL) from the 2013 Westchester County Soil Survey, U.S. Department of Agriculture, Soil Conservation Service. Data was updated September 2015 from U.S. Department of Agriculture, Natural Resources Conservation Service. https://websoilsurvey.sc.egov.usda.gov/App/HomePage.htm
Description: The National Wetlands Inventory (NWI) dataset was downloaded from the US Fish and Wildlife Service website at https://www.fws.gov/wetlands/Data/State-Downloads.html on 05/04/2021. Metadata derives from original NWI database and updated to reflect the date of download. According to website, this layer was updated last October 1st, 2020. This is a clip of all wetlands features within the Westchester County boundary minus all riverines, Long Island Sound, and the Hudson River.
This data set represents the extent, approximate location and type of wetlands and deepwater habitats in the United States and its Territories. These data delineate the areal extent of wetlands and surface waters as defined by Cowardin et al. (1979). The National Wetlands Inventory - Version 2, Surface Waters and Wetlands Inventory was derived by retaining the wetland and deepwater polygons that compose the NWI digital wetlands spatial data layer and reintroducing any linear wetland or surface water features that were orphaned from the original NWI hard copy maps by converting them to narrow polygonal features. Additionally, the data are supplemented with hydrography data, buffered to become polygonal features, as a secondary source for any single-line stream features not mapped by the NWI and to complete segmented connections. Wetland mapping conducted in WA, OR, CA, NV and ID after 2012 and most other projects mapped after 2015 were mapped to include all surface water features and are not derived data. The linear hydrography dataset used to derive Version 2 was the U.S. Geological Survey's National Hydrography Dataset (NHD). Specific information on the NHD version used to derive Version 2 and where Version 2 was mapped can be found in the 'comments' field of the Wetlands_Project_Metadata feature class. Certain wetland habitats are excluded from the National mapping program because of the limitations of aerial imagery as the primary data source used to detect wetlands. These habitats include seagrasses or submerged aquatic vegetation that are found in the intertidal and subtidal zones of estuaries and near shore coastal waters. Some deepwater reef communities (coral or tuberficid worm reefs) have also been excluded from the inventory. These habitats, because of their depth, go undetected by aerial imagery. By policy, the Service also excludes certain types of "farmed wetlands" as may be defined by the Food Security Act or that do not coincide with the Cowardin et al. definition. Contact the Service's Regional Wetland Coordinator for additional information on what types of farmed wetlands are included on wetland maps. This dataset should be used in conjunction with the Wetlands_Project_Metadata layer, which contains project specific wetlands mapping procedures and information on dates, scales and emulsion of imagery used to map the wetlands within specific project boundaries.
Description: This dataset identifies areas with steep slopes in two categories used in local planning agencies: slopes 15-25% and slopes over 25% (slope=rise/run).
Description: Dataset identifies land use categories at the tax parcel level in Westchester County, NY, and includes other boundary and ownership references for the internal use of the County. Comprised of the most recent tax parcel files available as of publication date, originally obtained from the various Towns and cities, and modified by the Westchester County Department of Planning.
Description: Compiled at a scale of 1:24,000, this data is intended for general planning purposes only, and may not be appropriate for site specific analysis. Updated (2012) to reflect basins renamed by the Westchester County Department of Planning and to align with updated Major and Minor Drainage Basins dataset "wcdrain".