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A Discharge Monitoring Report (DMR) is a United States regulatory term for a periodic water pollution report prepared by industries, municipalities and other facilities discharging to surface waters.〔United States Environmental Protection Agency (EPA), Washington, D.C. (2010) ("NPDES Permit Writers' Manual." ) Document no. EPA-833-K-10-001. p. 8-14.〕 The facilities collect wastewater samples, conduct chemical and/or biological tests of the samples, and submit reports to a state agency or the United States Environmental Protection Agency (EPA). All point source dischargers to ”Waters of the U.S.” must obtain a National Pollution Discharge Elimination System (NPDES) permit from the appropriate agency, and many permittees are required to file DMRs.〔Note: Some permittees, notably stormwater dischargers (e.g., construction site operators and municipal separate storm sewer systems), may not be required to file DMRs. These facilities prepare stormwater pollution prevention plans and may be required to submit other reports, which vary from state to state. ''See'' EPA, ("Stormwater Pollution Prevention Plans for Construction Activities." ) (Accessed 2015-09-17.)〕 ==NPDES permits and DMR reporting process== For permits other than stormwater permits, the agencies issue effluent limitations for specific pollutants, pursuant to the Clean Water Act (CWA). The basis for these limitations depends on the type of discharging facility, the discharge characteristics and status of the specific surface water body receiving the discharge. * National technology-based standards apply to many industries (these standards are called "effluent guidelines"), and to municipal sewage treatment plants.〔EPA. ("Secondary Treatment Regulation." ) ''Code of Federal Regulations,'' .〕 * Some dischargers are subject to water quality-based effluent limitations, derived from water quality standards for the adjacent water body. * For pollutants not covered by the above circumstances, the agency may set technology-based limitations based on its "best professional judgment" (BPJ).〔EPA, "NPDES Permit Writers' Manual," Section 5.2.3. "Case-by-Case TBELs for Industrial Dischargers." pp. 5-44ff.〕 Most NPDES permits require facilities to submit monthly DMRs, but some permits require seasonal or semi-annual reporting. Facilities may collect and analyze samples more frequently, e.g. weekly, and summarize the results for the prescribed reporting period. Permits typically require reporting of wastewater flow and the results of one or more chemical tests, such as pH, biochemical oxygen demand (BOD), total suspended solids (TSS), nutrients (nitrates and phosphorus), various toxic pollutants, temperature, etc. Some permits also require aquatic biomonitoring of the receiving waterbody. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Discharge Monitoring Report」の詳細全文を読む スポンサード リンク
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