A wastewater emissions inventory should be developed to identify and characterize all water that is discharged from the site. The emissions inventory should include: monthly flow, pH and pollutant loading (COD or BOD, at minimum). Monthly flow and pollutant loading are measured values. It may also include: the type of wastewater, source of generation, estimated annual flow, characterization, treatment method and cost of treatment. If possible, the emissions inventory should be subdivided into its type by origin.