Before revision: Effluent guidelines In the United States, the Clean Water Act requires all direct effluent discharges to surface waters to be regulated with permits under the National Pollutant Discharge Elimination System (NPDES) and all influent to treatment facilities to abide by the Pretreatment Program.
After revision: Pollution control regulation In the United States, the Clean Water Act requires all direct effluent discharges to surface waters to be regulated with permits under the National Pollutant Discharge Elimination System (NPDES) and all influent to treatment facilities to abide by the Pretreatment Program.