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Frequently Asked Questions

  1. How often are the data in Environmental Health WebMaps updated?

  1. Why does the map display time vary within WebMaps?

  1. What is a Federal Region?

  1. Why are there so many contaminants on the Contaminant drop down list?

  1. If I have a question regarding the Environmental Health WebMaps application, whom should I contact?

  1. What is the difference between an Active National Priority List site and an Active ATSDR Petition site?

  1. What is a Toxic Release Inventory (TRI) Facility?

  1. How often is the data in Environmental Health WebMaps updated?

    The Environmental Health WebMaps hazardous waste site and contaminant data is updated quarterly. The Environmental Protection Agency's Exit WebMaps (EPA) Toxic Release Inventory (TRI) data is updated annually in April. The program and resource data is continually updated.

  1. Why does the map display time vary within WebMaps?

    The display time is affected by how many options the map is trying to display. The more options the application has to display on the map means the application has to load more data, and the display time will be slower. If you are displaying one map option (e.g., Federal Region), then the map will display quickly. If you are displaying more than one map option (e.g., Federal Region, U.S. Rivers, and Congressional District), then it will take longer for the map to display.

  1. What is a Federal Region?

    The ten standard Federal Regions were established by the Office of Management and Budgets publication, Standard Federal Regions (Circular A-105), in April 1974, and are required for all executive agencies. The Federal Regions are as follows:

    • Region 1: Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, Vermont
    • Region 2: New Jersey, New York, Puerto Rico, Virgin Islands
    • Region 3: Delaware, Maryland, Pennsylvania, Virginia, West Virginia
    • Region 4: Alabama, Florida, Georgia, Kentucky, Mississippi, North Carolina,South Carolina, Tennessee
    • Region 5: Illinois, Indiana, Michigan, Minnesota, Ohio, Wisconsin
    • Region 6: Arkansas, Louisiana, New Mexico, Texas, Oklahoma
    • Region 7: Iowa, Kansas, Missouri, Nebraska
    • Region 8: Colorado, Montana, North Dakota, South Dakota, Utah, Wyoming
    • Region 9: Arizona, California, Hawaii, Nevada (American Samoa, Guam, Northern Mariana Islands, Trust Territory of the Pacific Islands)
    • Region 10: Alaska, Idaho, Oregon, Washington

  1. Why are there so many contaminants on the Contaminant drop down list?

    The contaminant drop down list on the application's Map Options tab directly correlates with the contaminants at the hazardous waste sites and TRI facilities. Every contaminant found at the hazardous waste sites or TRI facilities is listed on the contaminant drop down list.

    The contaminant's can be filtered using the A-Z list, under the contaminants label.  This will filter the list based on the first letter of the contaminant name. 

  1. If I have a question regarding the Environmental Health WebMaps, whom should I contact?

    To contact a member of the Environmental Health WebMaps team, click on the Contact Us link on the main Environmental Health WebMaps page or send an e-mail to

  1. What is the difference between an Active National Priority List site and an Active ATSDR Petition site?

    A National Priority List (NPL) Site comes from a list of national priorities among known releases or threatened releases of hazardous substances, pollutants, or contaminants throughout the United States and its territories. The NPL is intended primarily to guide the EPA in determining which sites warrant further investigation. For more information about NPL Sites, refer to the Environmental Protection Agency (EPA) Web site.

    An ATSDR Petition Site is one that has been petitioned by the general public for ATSDR to conduct a Public Health Assessment. Once ATSDR receives a petition, an assigned team of ATSDR professional staff reviews the petition, gathers information about the location, evaluates their findings, and reports their findings to the ATSDR petition committee. The petition committee then determines the agency's next course of action. For more information about the Petitioned Public Health Assessment process, refer to the  Petitioned Public Health Assessment.

    1 National Priority list description. Retrieved July 31, 2006, from National Priorities List (NPL)  Web site.

  1. What is a Toxic Release Inventory (TRI) facility?

    The EPA and state environmental agencies annually collect data from industrial facilities where a release or transfer of certain toxic chemicals has occurred. For more information about TRI facilities, refer to the EPA's TRI program Exit WebMaps Web site.

Contact Us:
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