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EPA is also required to review and revise regulations as needed, and since 1972 it has promulgated ELGs for 59 industrial categories, with over 450 subcategories. Approximately 40,000 facilities that discharge directly to the nation's waters, 129,000 facilities that discharge to POTWs, and construction sites, are covered by the regulations.
Direct discharges are pollutants that are discharged directly to a surface water body. [18]: 1–7 To legally discharge pollutants directly into a waterbody, a facility—municipal, industrial, commercial or government-owned—must obtain a National Pollution Discharge Elimination System (NPDES) permit from EPA or a state agency. [19]
The Urban Waste Water Treatment Directive (full title "Council Directive 91/271/EEC of 21 May 1991 concerning urban waste-water treatment") is a European Union directive regarding urban wastewater collection, wastewater treatment and its discharge, as well as the treatment and discharge of "waste water from certain industrial sectors".
For water bodies with stringent standards, such as Lake Tahoe, POTWs must treat their discharges to tertiary treatment levels, and then pump all treated water out of the drainage basin so that no effluent ever drains to a certain body of water. [3] Such higher standards may require the POTW to construct improvements to its plant(s).
The EPA regulations require each facility to apply for a specific permit for its wastewater discharges, and consequently require that each facility treat its wastewater. [101] In addition to effluent limitations , the permits include monitoring and reporting requirements, which are used by EPA and states to enforce the limitations. [ 17 ]
Based on results from a national wastewater dilution model, the authors calculated that PFAS discharges in wastewater may be permeating the drinking water supplies of as many as 23 million Americans.
New Source Performance Standards (NSPS) are pollution control standards issued by the United States Environmental Protection Agency (EPA). The term is used in the Clean Air Act Extension of 1970 (CAA) to refer to air pollution emission standards, and in the Clean Water Act (CWA) referring to standards for water pollution discharges of industrial wastewater to surface waters.
Effluent in the artificial sense is in general considered to be water pollution, such as the outflow from a sewage treatment facility or an industrial wastewater discharge. An effluent sump pump , for instance, pumps waste from toilets installed below a main sewage line.