污水 (wū shuǐ) means “sewage”. It is an HSK 5 Chinese word in the HSK 3.0 vocabulary.
Practice each character:
工厂不能随便排放污水。
Gōngchǎng bù néng suíbiàn páifàng wūshuǐ.
Factories cannot discharge sewage carelessly.
Updated: 2026-07-18