This report describes the revised Organic Chemical Producers Data Base (OCPDB), an automated chemical information system developed for the U.S. Environmental Protection Agency (EPA). Improvements have been made in two ways: (1) expansion of the data base to include more chemicals and more information about each and (2) implementation of the system through a data base management system. The revised data base includes almost 600 chemicals and more than 1300 producers. Chemicals are described by Chemical Abstracts Services (CAS) registry number, Wiswesser Line Notation (WLN), industrial process descriptions, chemical uses, synonyms, toxicity, economic data, and producers. Priority Pollutants identified as a result of NRDC vs. EPA are marked and process descriptions are cross-referenced with another EPA reference source, The Industrial Process Profiles for Environmental Use (IPPEU). Locations of producers are described by city, state, EPA region, and river basin. The chemicals produced at each location are listed, along with nameplate capacities, when available. Retrieval is possible through use of 'key' data elements: chemical name, synonyms, OCPDB number, CAS numbers, WLN, priority pollutant markers, process ID number, IPPEU numbers, producer company name, parent company name, city, state, river basin, and EPA region.