Welcome to NWEA’s Document Library
This main page of the Document Library contains the most recent additions (see below). Archived older documents, as well as recent ones, can be retrieved by conducting a search of our data base. The subjects you will find covered in the data base include; Air pollution, Anti-degradation, Ballast water , Climate change, Columbia River, Dredging, Energy, Non-point source pollution (logging, farming, etc.), NPDES permits for water discharges, Superfund, Total Maximum Daily Loads (TMDL), Toxics, Water pollution, Water Quality Standards, Willamette River. Also available is our NPDES Permit Program Authorization Letters data base, letters from the U.S. Environmental Protection Agency (EPA) authorize states to issue NPDES permits to point sources and pretreatment facilities.