| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | septic tank | Western countries | Commonly used for rural or suburban sewage treatment and disposal | 1 |
| 2 | sewage system | Western countries | Integrated part of urban infrastructure, commonly found in households | 1 |
| 3 | sewage system | Western countries | Strict regulations and standards for disposal and treatment of wastewater | 1 |
| 4 | sewer | Western countries | Sewers are an essential part of urban infrastructure for managing wastewater and preventing environmental pollution. | 1 |
| 5 | sewer | Western countries | Underground system for carrying away wastewater and sewage from households and buildings | 1 |