noun
dirty water; sewage; wastewater
Refers to water contaminated by domestic, industrial, or agricultural waste. Often used in environmental, engineering, or public health contexts.
工場から出る汚水は、浄化してから川に流さなければならない。
Wastewater from factories must be purified before being released into rivers.
この地域では、生活汚水の処理が大きな
In this area, treatment of domestic sewage is a major challenge.