Executive summary -- History of the Clean Water Act -- General prohibition of discharges -- NPDES overview -- Technology-based standards -- Water-quality-based effluent limitations -- Regulations of publicly owned treatment works, and pretreatment requirement for dischargers to POTWS -- Regulation of wetlands -- Discharges and spills of oil and hazardous substances -- Wet-weather discharges from point sources -- Reducing nonpoint source pollution -- Enforcement