汚水

1. Origins, structure, and basic meaning

• Structure: 汚水(おすい) means polluted or dirty water.
• Basic usage: It describes water overflowing from a damaged pipe or being purified at a facility.

2. Common pitfalls and similar expressions

• Water condition versus discharge
  • 汚水 focuses on the water being dirty; 排水 focuses on draining water or the water discharged.
• Reading 汚
  • Here 汚 is read お, producing the whole reading おすい.