What data sources does TOXMAP use?

The data found in TOXMAP comes from several providers, including:
  • Toxics Release Inventory (TRI)

    A federal law called the Emergency Planning and Community Right to Know Act (EPCRA) requires facilities in certain industries which manufacture, process, or use significant amounts of toxic chemicals, to report annually on their releases of these chemicals. The reports contain information about the types and amounts of toxic chemicals that are released each year to the air, water, land and by underground injection, as well as information on the quantities of toxic chemicals sent to other facilities for further waste management.

    Facilities with ten or more full-time employees that process more than 25,000 pounds in aggregate, or use greater than 10,000 pounds of any one TRI chemical, are required to report releases annually. The US Environmental Protection Agency (EPA) maintains this information in a database called the Toxics Release Inventory (TRI). The toxics release files on the National Library of Medicine's® (NLM) Toxicology Data Network (TOXNET®) come from TRI.

    TOXMAP uses the TRI data from the 2016 National Analysis dataset. NLM TOXNET uses the most current TRI data. Data submission deadlines, data entry processes, and data quality control and review all influence the actual date of data release by both the EPA and by TOXNET. A complete list of TRI chemicals required to be reported to the EPA can be found at their TRI-Listed Chemicals page.

    NOTE: At this time, TOXMAP uses reported on-site releases only. Some TRI chemicals have no reported releases, and so will not appear in the TRI release data or in TOXMAP.

    For more information, see the TRI Fact Sheet.


    CERCLIS contains information about Superfund sites, such as the current status of cleanup efforts, cleanup milestones reached, and amounts of liquid and solid media treated at sites on the National Priorities List (NPL) or under consideration for the NPL. The CERCLIS database can be searched online.

  • US Census

    TOXMAP Census data from 2000 and 2010 comes directly from the US Census. This includes selected county-level demographics (age, male/female ratio, population and race/ethnicity) and can be found in its original form on the US Census Bureau's website. TOXMAP's Native Lands layer is also comprised of data from the US Census.

  • National Cancer Institute SEER

    TOXMAP uses the NCI's SEER*Stat database for its cancer and disease mortality data. Underlying mortality data is provided by the NCHS, part of the US Department of Health and Human Services.

  • EPA's Air Markets Program Data (AMPD)

    AMPD is a publicly-available data system from the EPA Clean Air Markets program for searching and downloading data collected as part of EPA's emissions trading programs. TOXMAP displays all facilities in all programs covered in the AMPD in 2017 whose primary or secondary fuel type is coal-related (e.g., Coal, Coal Refuse, and Petroleum Coke).

  • Energy Information Administration (EIA)

    Coal plants in TOXMAP link to their associated record in the EIA Electricity Data Browser.

  • EPA's Facility Registry System (FRS)

    TOXMAP plots the location of TRI facilities using addresses and coordinates from the EPA's Facility Registry System (FRS). The FRS is a centrally managed database that identifies facilities, sites or places subject to environmental regulations or of environmental interest.

  • Hazardous Substances Databank® (HSDB)

    HSDB contains comprehensive toxicological information on more than 4,700 chemicals. Data in HSDB are peer-reviewed, and are derived and referenced from a core set of books, government documents, technical reports and selected primary journal literature. For more information, see the HSDB Fact Sheet.

  • The Bureau of Economic Analysis (BEA)

    The BEA, part of the US Department of Commerce, publishes the per capita personal income data used by TOXMAP.

  • National Atlas of the United States of America (USGS)

    TOXMAP used the USGS's National Atlas (now part of The National Map) for 1990 county-level demographics (age, male/female ratio, population and race/ethnicity) and can be found in its original form on the US Census Bureau's website.

  • Environment and Climate Change Canada

    Environment and Climate Change Canada publishes data from the NPRI, Canada's legislated, publicly accessible inventory of pollutant releases (to air, water and land), disposals and transfers for recycling.

  • Nuclear Regulatory Commission

    The Nuclear Regulatory Commission publishes the commercial nuclear power plant data found in TOXMAP.

  • Esri

    All basemaps (Streets, Topographic, Aerial) come from Esri, as do congressional district boundaries.