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U.S. EPA Enforcement and Compliance History Online (ECHO) - Clean Water Act (CWA) Rest Services API Technical Specs & Reference

Detailed technical specifications for U.S. EPA Enforcement and Compliance History Online (ECHO) - Clean Water Act (CWA) Rest Services API including version 2019.10.15 data.
📅 Last updated: April 20, 2026

U.S. EPA Enforcement and Compliance History Online (ECHO) - Clean Water Act (CWA) Rest Services Logo

U.S. EPA Enforcement and Compliance History Online (ECHO) - Clean Water Act (CWA) Rest Services API Overview

Enforcement and Compliance History Online (ECHO) is a tool developed and maintained by EPA’s Office of Enforcement and Compliance Assurance for public use. ECHO provides integrated compliance and enforcement information for over 1 million regulated facilities nationwide. CWA Rest Services provides multiple service endpoints, each with specific capabilities, to search and retrieve data on facilities regulated under the Clean Water Act (CWA) and managed under the National Pollutant Discharge Elim…

Technical Specifications

AttributeDetails
Providerepa.gov
Current Version2019.10.15
FormatOpenAPI / JSON

Integration Information

Reference for version 2019.10.15.


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