Frequent Questions

What is the System of Registries (SOR)?

The System of Registries (SOR) is an umbrella of interrelated tools, services, data repositories, and system components. These are primarily intended as a resource for developers, and enterprise architects, but may be used by others.


This umbrella system includes registries for the following areas:

  • System Inventory Services
  • Reusable Component Services Data
  • Registry Services
  • Terminology Services
  • Substance Registry Services
  • Facilities Registry System


The System of Registries is supported by a staff of data management and environmental professionals who assist users by facilitating the development of data standards and terminology, promoting identification of reusable components, and supporting the stewardship of system inventories, data dictionaries, and other important EPA metadata resources.

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