| Subject | Norwegian Bokmål | English |
| environ. | avløpsvannbehandling på stedet | on-site wastewater treatment A process in which used or spent water is treated at the point of origin or where it was produced, by using a septic tank or some other system to remove or reduce the impact of constituent wastes on human health and the environment |
| environ. | biologisk avløpsvannbehandling | biological wastewater treatment Types of wastewater treatment in which biochemical or bacterial action is intensified to oxidize and stabilize the unstable organic matter present. Examples of this type of treatment use intermittent sand filters, trickling filters, and activated sludge processes and sludge digestion |
| environ. | individuell avløpsvannbehandling | individual wastewater treatment The process of using a natural system or mechanical device to collect, treat and discharge or reclaim wastewater from an individual dwelling without the use of community-wide sewers or a centralised treatment facility |
| environ. | kollektiv avløpsvannbehandling | collective wastewater treatment |