The ECHO data sets have been compiled for access to larger sets of national data to ensure that ECHO meets your data retrieval needs. While ECHO provides data detailing compliance assurance and enforcement activities related to federal environmental laws, it has a limited online display of data. The ECHO data sets are available for download to review these expanded data sets. Each data set is a compressed zip file containing one or more comma-delimited text files. The download summary documents posted after each data set contain a file listing and definitions of included data elements. Data sets include information on Clean Air Act Stationary Sources, NPDES dischargers, Discharge Monitoring Reports (DMR), hazardous waste, and civil enforcement information. Datasets will be updated weekly.