Overview

Locational information for EPA-regulated facilities in Envirofacts is cultivated from many sources, including EPA federal program systems (through monthly snapshots), and EPA regional offices and the states (through Supplementary Return Files). This information is collected and refined under the auspices of the Locational Data Improvement Project (LDIP) enacted by the Agency to improve locational data and compliance with the Agency's Locational Data Policy.

The primary objective of this effort is to identify, collect, verify, store, and maintain an accurate, consistently documented set of locational data for entities of environmental concern. A secondary objective is to support the infrastructure needed to manage these data in a manner that yields integration across national, regional, tribal, and state systems. The intent is to support EPA's movement toward data integration based on location, thereby promoting the use of EPA's data resources for a wide array of cross-media analysis, such as community-based ecosystem management and environmental justice.

The locational information in Envirofacts is stored in the Locational Reference Tables (LRT). The LRT act as a storehouse for the actual locational data as well as the business rules that are applied to them in order to provide the most accurate information available for depicting the locations of federally regulated entities.

There is a graphic LRT model and information on related table and column information.

Overview

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