On occasion, an individual wastewater source inside a home or business should be separated from the rest of the onsite wastewater treatment system due to treatability or regulatory issues.
Many OWTS regulations are designed to only treat domestic wastewater from normal domestic activities. However, there are many waste streams that require further treatment. Some of those sources may be defined as not sewage, such as animal waste, while other floor drains, utility sinks, laboratory drains, disinfecting basins and dishwashers may produce such a high strength of wastewater that it is economically beneficial to treat it separately or pump and haul it
