汚水|おすいosui[0]heiban (flat)

1. nounfilthy water; sewage
   そして汚水おすいを流ながすために地下ちかに下水道げすいどうを持もっていた。↗

   The house has pipes under the ground to carry dirty water away.

• Related下水げすいNeutralWastewater from homes and industry, and also the sewer facilities themselves; it centers on the drainage system, while 「汚水」 centers on the water being dirty.
• Antonym浄水じょうすいNeutralThe opposite of 「汚水」: water that has been purified; often seen in 「浄水器」 (water purifier).
• Antonym清水しみずNeutralAn antonym: clear spring water, standing opposite to the dirty water that 「汚水」 refers to.

Use 「汚水」 for dirty water from households and factories, as in 「汚水処理」. For the drainage system or sewers say 「下水」; for purified water 「浄水」; for clear spring water 「清水」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 家庭かていや工場こうじょうなどから発生はっせいする汚きたない水みず。