AndreaBozzo/ceres-open-data-index huggingface dataset:
Impaired 2024 River Lake Estuary Set

Connecticut 303(d) Impaired Waters 2024 is a subset of Connecticut 305(b) Assessed Waters 2024. If any one of the assigned designated uses is categorized as NOT Supporting, the assessed waterbody is included in this subset and is considered impaired. Additional information about Integrated Water Quality reporting is available on the CT DEEP website, Integrated Water Quality Report page. Connecticut 305(b) Assessed Waters files includes rivers, lakes and estuaries that have been assessed in compliance with Sections 305(b) and 303(d) of the federal Clean Water Act. Section 305(b) of the Clean Water Act requires each state to monitor, assess and report on the quality of its waters relative to attainment of designated uses established by the State's water quality standards. Section 303(d) requires each State to compile a subset of that list identifying only those waters not meeting water quality standards and assign a Total Maximum Daily Load (TMDL) priority ranking to each impaired waterbody. This assessment is based on information collected and compiled prior to 2024. It represents conditions at a particular point in time and does not represent current conditions. Depending on the type of waterbody - river, lake, or estuary - this information geographically displays attainment and non-attainment (e.g. full supporting, not supporting, not assessed) for each designated use - aquatic life, marine aquatic life, recreation use, fish consumption, shellfish harvesting, and drinking water supply.
CT Housing Data Hub - Housing Market Data

This feature layer provides current housing market indicators for municipalities in Connecticut, derived from Realtor.com’s real estate data library. It is spatialized by town and updated monthly for display and analysis in the Connecticut Housing Data Hub. The dataset supports monitoring of real-time housing market trends in Connecticut, including indicators such as median listing prices, time on market, and inventory levels. CT Geodata Portal Housing landing page: [https://geodata.ct.gov/pages/housing] Realtor.com data: [https://www.realtor.com/research/data/] Geographic Extent * Coverage: State of Connecticut Classifications * Sensitivity: Public * Usage: Public Use * Quality: High Quality * Known Quality Issues: None known, but subject to standard limitations of third-party commercial data Currency * Created: 2022 * Update Frequency: Monthly * Last Updated: August 2025 Lineage * Originated: Realtor.com (original data) * Product Traceability: Used in the Connecticut Housing Data Hub to show recent market activity by town Credits * Data Steward: Sarah Hurley (GIS Analyst, CT GIS Office)
Broadband Availability by Town 2025

# Broadband Availability Data — Town-Level Summary ### What the dataset includes Location counts * Total broadband serviceable locations * Number of providers * Counts of unserved, underserved, and served locations * Locations capable of gigabit, near-gigabit, or meeting the state’s 1000/100 Mbps goal Technology availability * Presence of major FCC technology codes: copper/DSL (10), cable (40), fiber (50), and Fixed Wireless Access (71) * Percent of locations served by each technology type Speed statistics * Maximum, minimum, median, and 75th percentile advertised download and upload speeds Provider information * All providers present * Providers offering gigabit, ≥100/20 Mbps, or ≥1Gbps/100 Mbps service
Broadband Adoption by Planning Region 2025

This layer presents adoption (subscription) data aggregated at the planning region level. Twice a year, internet service providers submit data to OPM with the information required to develop and maintain an up-to-date broadband map showing the availability of broadband Internet access service and subscription by broadband Internet speed offered by such provider. Subscription data is submitted at the tract level and aggregated to town and planning region geographies. Find and learn more about broadband data in Connecticut at: [Connecticut Broadband Mapping Hub.]
Connecticut Steep Slope Areas

Overview This Feature Service provides detailed geographic information on steep slope areas within the state of Connecticut. This layer was derived from the 2023 Digital Elevation Model from the [2023 Spring imagery and lidar capture]. It is developed to support planning, environmental management, and risk assessment related to slope stability. Details about layer development: [https://github.com/ctgisoffice/steep_slopes] Feature Layers * Steep Slope 10 ft: This layer maps areas with steep slopes derived from a 10-feet per pixel DEM, providing details such as slope percentage, municipality, and council of governments (COG) region. It offers data for assessing terrain steepness over larger vertical intervals. * Steep Slope 2 ft: This layer captures steep slopes derived from a 2-foot per pixel DEM, allowing for more detailed slope analysis at a smaller vertical resolution. Similar attribute details like slope percent, municipality, and COG are included, supporting higher-resolution terrain studies. Geographic Coverage The data covers the landscape of Connecticut, focusing on areas with significant slope gradients that may impact land use and development. Classifications * Agency: OPM * Sensitivity: Public Currency (time) * Created Data: 2026 * Update Frequency (estimated): none Lineage * Originated: Derived from the 2023 Digital Elevation Model from the [2023 Spring imagery and lidar capture] Attributes * Slope_Percent - The category of percent steep slope. Moderate (10%-15%), Steep (15%-20%), Very Steep (20%+). * Muni - Municipality * COG - Council of Governments Scale Range * State (1:5,000,000) Credits * Connecticut GIS Office
State Wildlife Action Plan Conservation Opportunity Areas Set

The 2025 Connecticut State Wildlife Action Plan conservation opportunity areas (COAs) represent locations partners can conduct actions to benefit wildlife populations and habitats and achieve State Wildlife Action Plan Goals. There are 7 total COAs that represent broad actions: protect, connect, restore, manage, partner, inform, and research and monitor. This effort combined ecological and social data in a spatial prioritization software called Zonation to identify priority areas that reflect the 7 actions. Each COA has different ecological and/or social data included to reflect its unique goal.
Environmental Justice Affecting Facilities 2026

Affecting Facilities Statutory Definition Affecting facilities are defined in section 22a-20a of the Connecticut General Statutes (CGS) as any facility that falls under at least one of the following categories: (A) electric generating facility with a capacity of more than 10 megawatts (B) sludge or solid waste incinerator or combustor (C) sewage treatment plant with a capacity of more than 50 million gallons per day (D) intermediate processing center, volume reduction facility (VRF) or multitown recycling facility with a combined monthly volume in excess of 25 tons (E) new or expanded landfill, including, but not limited to, a landfill that contains ash, construction and demolition debris or solid waste (F) medical waste incinerator (G) major source of air pollution, as defined by the federal Clean Air Act Description of Affecting Facilities Attributes Facility Type: Air = site is an electric generating facility with a capacity of >10 MW and/or a major source of air pollution Waste = site is a solid waste incinerator, landfill, and/or intermediate processing center, volume reduction facility or multitown recycling facility with a combined monthly volume >25 tons Water = site is a sludge incinerator and/or a sewage treatment plant with a permitted capacity of >50 million gal/day Air, Waste = site falls under both the Air and Waste facility categories Air, Water = site falls under both the Air and Water facility categories
CT Congressional Districts

This feature layer represents the boundaries of Connecticut's congressional districts based on the latest redistricting process following the 2020 Census. More information about the 2021 Redistricting Project can be found [here]. The dataset includes the five congressional districts with fields identifying the current U.S. House Representative and their associated political party for each district. The geometry is derived from the published data from the [Connecticut General Assembly]. The CT Congressional Representations are as described [here]. Collection of CT Legislative District published feature layers: * [Congressional districts] * [Senate districts] * [House districts] Attributes ─────────────────┬──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── District │Congressional district number (text/string) ─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── DistrictN │Congressional district number (number/integer) ─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── Party │Representative’s political party (Democratic or Republican) ─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── First Name │Representative’s first name ─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── Last Name │Representative’s last name ─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── Full Name │Representative’s full name ─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── Full Name + Party│Representative’s full name, plus political party ─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── Term │The two-year term during which the representative serves in their elected role ─────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── Adjacent Color ID│An ID for the purpose of symbolization, so that each polygon receives a different color than the polygon adjacent to it. ─────────────────┴────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
Long Island Sound 2023 Topobathy

This image service is available through [CTECO], a partnership between [UConn CLEAR] and [CT DEEP]. Dataset Information Extent: Long Island Sound coastline of Connecticut and New York Dates: 2023 (March 5 - October 28) Data Info: Pixel Resolution: 1 foot raster derived from Lidar point cloud Projection: CT State Plane NAD 83 (2011) Feet (EPSG 6434) Service Projection: WGS 1984 Web Mercator Auxiliary Sphere (EPSG 3857) More Information - [Metadata] - [Project Report] - [Bulk Download] - [Custom Download] Credit and Funding This lidar data was required by National Oceanic and Atmospheric Administration (NOAA) and the National Geodetic Survey (NGS), Remote Sensing Division Coastal Mapping Program (CMP)
Broadband Availability by Planning Region 2025

Broadband Availability Data at the Planning Region Level What you can find in this dataset: Location counts * Total broadband serviceable locations * Number of providers * Counts of unserved, underserved, and served locations * Locations capable of gigabit, near-gigabit, or meeting the state’s 1000/100 Mbps goal Technology availability * Presence of major FCC technology codes: * copper/DSL (10) * cable (40) * fiber (50) * Fixed Wireless Access (71) * Percent of locations served by each technology type Speed statistics * Maximum, minimum, median, and 75th percentile advertised download and upload speeds Provider information * All providers present * Providers offering gigabit, ≥100/20 Mbps, or ≥1Gbps/100 Mbps service
CT Housing Data Hub - Permitting DECD

This feature layer displays annual counts of new residential construction permits and housing demolitions in each Connecticut municipality, as reported in the Department of Economic and Community Development’s (DECD) Annual Construction Report. The dataset is spatialized by town for use in the Connecticut Housing Data Hub. This dataset includes: * Annual counts of new housing units authorized by building permits * Permitting data broken down by housing type (e.g., single-family, two-family, three- or four-family, five or more units) * Counts of residential demolitions by year and town CT Geodata Portal Housing landing page: [https://geodata.ct.gov/pages/housing] DECD Annual Construction Report: [https://data.ct.gov/Housing-and-Development/DECD-Annual-Construction-Report-1997-2024/wmfh-25km] DECD Housing Data: [https://portal.ct.gov/decd/content/about_decd/research-and-publications/01_access-research/exports-and-housing-and-income-data] Geographic Extent * Coverage: State of Connecticut Classifications * Sensitivity: Public * Usage: Public Use * Quality: High Quality * Known Quality Issues: None Currency * Created: 2022 * Update Frequency: Annually * Last Updated: August 2025 Lineage * Originated: Connecticut Department of Economic and Community Development * Notable Changes: Shift from federal to state-collected data beginning in 2018 * Product Traceability: Used in the Connecticut Housing Data Hub and in analyses of housing growth and redevelopment patterns Credits * Data Steward: Sarah Hurley (GIS Analyst, CT GIS Office)
CT Housing Data Hub - ACS 5 Year Data

This feature layer contains housing-related indicators from the U.S. Census Bureau’s American Community Survey (ACS) 5-Year Estimates, along with calculated fields derived from the ACS source data. It is intended for use in the Connecticut Housing Data Hub to support mapping, analysis, and decision-making. The dataset includes both raw variables directly pulled from the ACS (e.g., median rent, housing unit counts, vacancy rates) and additional calculated indicators (e.g., rent burden percentages, housing cost ratios) developed using custom Python scripts. Data is updated annually using the most recent ACS 5-Year Estimates available. All variables are spatially joined to CT municipality geometries and are formatted for compatibility with web mapping applications and dashboards. CT Geodata Portal Housing landing page: [https://geodata.ct.gov/pages/housing] Geographic Extent * Coverage: State of Connecticut Classifications * Sensitivity: Public * Usage: Public Use * Quality: High Quality * Known Quality Issues: None Currency * Created: 2022 * Update Frequency: Annually (based on ACS 5-Year release cycle) * Last Updated: August 2025 Lineage * Originated: CT GIS Office (Office of Policy and Management) * Methodology: Data was pulled and processed using custom Python scripts that access the U.S. Census Bureau API. Calculations were made on select fields to improve analytical usefulness. * Notable Changes: Calculated fields are reviewed and refined with each ACS release. * Product Traceability: Data is displayed in the Connecticut Housing Data Hub and used in housing dashboards and story maps. Credits * Data Steward: Sarah Hurley (GIS Analyst, CT GIS Office)
Broadband Adoption by Tract 2025

# Broadband and Internet Access Dataset — Tract-Level Summary #### Broadband Subscription Data * Total broadband subscriptions across all technologies * Total Residential broadband subscriptions * Subscriptions by technology type: * Copper/DSL (tech 10) * Cable (tech 40) * Fiber (tech 50) * Fixed Wireless (tech 71) * Residential subscriptions at or above 100/20 Mbps #### Speed and Technology Availability * Maximum and minimum advertised download/upload speeds * Unique combinations of advertised speed tiers * Best non-fixed wireless download and upload speeds * Presence of major technologies (DSL, cable, fiber, fixed wireless) * Number of technology types available in the tract * Percent of subscriptions by technology type * Availability of gigabit symmetric service (≥1000/1000 Mbps) #### Provider Information * Total number of broadband providers * List of providers serving the tract * Technology-specific provider presence #### Household Internet Access and Adoption (ACS 2023 5-year) * Total number of households * Households with and without internet subscriptions * Households with dial-up only * Households with cable, fiber, or DSL only * Households with satellite internet only * Households with access but no subscription * Households with no internet access * Internet adoption rate (percent of households) * Breakdown of household internet access types by percentage
Broadband Availability by Block 2025

# Broadband Availability Data — Block-Level Summary ### What the dataset includes For each Census block, the dataset provides: Location counts * Total broadband serviceable locations * Number of providers serving the block * Counts of unserved, underserved, and served locations * Locations capable of gigabit, near-gigabit, or meeting the state’s 1000/100 Mbps goal Technology availability * Presence of major technologies: copper/DSL (10), cable (40), fiber (50), and Fixed Wireless Access (71) * Percent of locations served by each technology type * Lists of providers offering each technology Speed statistics * Maximum, minimum, median, and 75th percentile advertised download and upload speeds * Average and standard deviation of advertised speeds Provider information * All providers present in the block * Providers offering gigabit, ≥100/20 Mbps, or ≥1Gbps/100 Mbps service * Lists of fiber, cable, copper, and fixed-wireless providers Business vs. residential * Counts and percentages of business, residential, and mixed-use (BRX) locations
Soils All Soils

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. 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.
Local Emergency Planning Committees (LEPC)

In May 1987, pursuant to Section 22a-601(b) of the Connecticut General Statutes (CGS), the State Emergency Response Commission (SERC) designated local planning districts by notifying the Chief Elected Official in each municipality that each municipality was designated as a Local Emergency Planning Committee (LEPC). Since that time, many municipalities have joined together to form regional emergency planning committees. The SERC works to continuously update LEPC designations to reflect actual working relationships between towns and within regions to ensure the designation of the LEPC reflects the reality of each town's emergency preparedness and response capabilities. This dataset is updated quarterly.
EPCRA Tier 2 Facilities

Submission of Tier II form is required under Section 312 of the Emergency Planning and Community Right-to-Know Act of 1986 (EPCRA). The purpose of this form is to provide state, tribal, and local officials, and the public with specific information on potential hazards. This includes the locations, as well as the amount, of hazardous chemicals present at facilities during the previous calendar year.
Connecticut Road

Connecticut Roads and Trails is 1:24,000-scale base map data. It depicts the location of all roads and trails published on the USGS topographic quadrangle maps. For base map purposes, use this layer with other 1:24,000-scale base map data such as Hydrography, Railroads, Airports, and Towns. The Roads and Trails layer includes information within Connecticut and is derived from the Roads and Trails Master layer, which includes all road and trail features depicted on all of the U.S. Geological Survey (USGS) 7.5 minute topographic quadrangle maps that cover the State of Connecticut. This layer may be used as a possible data source for other 1:24,000-scale layers having features that should coincide with the roads and trails on the USGS topographic quadrangle maps. Not intended for maps printed at map scales greater or more detailed than 1:24,000 scale (1 inch = 2,000 feet.) Connecticut Roads and Trails is a 1:24,000-scale, feature-based layer that includes road and trail features on the U.S. Geological Survey (USGS) 7.5 minute topographic quadrangle maps for the State of Connecticut. This layer only includes features located in Connecticut. The layer is based on information from USGS topographic quadrangle maps published between 1969 and 1984 and does not represent the road network in Connecticut at any one particular point in time. The layer does not depict current conditions and excludes many roads that have been built, modified, or removed since the time these topographic quadrangle maps were published. The layer includes Interstate highways, US routes, state routes, local roads, unpaved roads, traffic circles, bridges, cul-de-sacs, trails, etc. It does not include route number, street name, house address, traffic direction, or traffic volume information for these features. Nor does it represent a complete or current network of hiking trails. Features are linear and represent road centerlines. Attribute information is comprised of codes to cartographically represent (symbolize) road and trail features on a map. This layer was originally published in 1994. The 2005 edition includes the same road features published in 1994, but the attribute information has been slightly modified and made easier to use.