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| Subject | Catalan | English |
| environ. | aigua residual | waste water Used water, or water that is not needed, which is permitted to escape, or unavoidably escapes from canals, ditches, reservoirs or other bodies of water, for which the owners of these structures are legally responsible |
| environ. | aigua residual combinada | combined waste water A mixture of domestic or industrial wastewater and surface runoff |
| environ. | aigua residual industrial | industrial waste water Waste water that results from industrial processes and manufacturing. It may either be disposed of separately or become part of the sanitary or combined sewage |
| environ. | quantitat d'aigua residual | residual amount of water Amount of water left in a water course after it has fed a hydropower plant in order to maintain a satisfactory dry-weather-flow for allowing the survival of biotic communities |