how do you know if the area is clean and sanitized?

Question: how do you know if the area is clean and sanitized?
- Keywords:
  clean,
  sanitized
Asked by 227metd44 to Nicola on 18 Nov 2015.
- Nicola Greene answered on 18 Nov 2015:
  
  Hello
  
  Usually its just a visual inspection. You can walk around and look for signs of human or solid waste. How dangerous it is can depend on soil conditions and weather e.g. if its raining this waste might get washed into a river that people drink from.
  
  Nicola

Question: how do you know if the area is clean and sanitized?