Developer Central
EPA's Developer Central is a resource for developers who are interested in building applications using EPA data and Web services.

National Nutrient Database

The National Nutrient Criteria Database allows users to derive ecoregion- and waterbody-specific numeric nutrient criteria ranges.

National Emission Inventory (NEI)

This data exchange allows states to submit data to the U.S. EPA’s National Emissions Inventory (NEI). NEI is a national database of air emissions...

National Assessment Database

The National Assessment Database stores and tracks state water quality assessment decisions, Total Maximum Daily Loads (TMDLs) and other watershed plans designed to restore...