Frequent Questions

How does EPA use Geographic Information Systems in its work? Does EPA have GIS data available online?

Geospatial data helps EPA to understand environmental conditions in specific locations. Among other things, EPA uses geospatial data to:

  • Promote environmental justice
  • Conduct risk assessments
  • Assess Superfund sites
  • Develop community-based environmental protection projects
  • Calculate total maximum daily loads for streams (TMDL)
  • Track pollutant distribution
  • Identify threatened or endangered species in watersheds

For more information, see Geospatial Resources at EPA.

EPA makes public geospatial data through its Environmental Dataset Gateway (EDG). The EDG is a gateway to Web-based geospatial information and information services. It enables data consumers to discover, view and access geospatial resources (e.g. data, services, or applications) made available by EPA's program offices, regions, and labs.

EPA has also developed publicly accessible geospatial applications to help the public access and visualize environmental information.

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