conventional pollutant is a term used in the USA to describe a water pollutant that is amenable to treatment by a municipal sewage treatment plant. A basic list of conventional pollutants is defined in the U.S. Clean Water Act. The list has been amended in regulations issued by the Environmental Protection Agency: * biochemical oxygen demand (BD) * fecal coliform bacteria * oil and grease * pH (exceeding regulatory limits) * total suspended solids (TSS).