Wastewater contains dangerous pathogens at least until it reaches garden areas, even if water appears clean. Treat it with respect to avoid contracting diseases and prevent transporting pathogens off site.
Workers need to avoid bringing pathogens on site. A list of precautions is found in the 'Guide to Wastewater Recycling for Tropical Regions'
Photo: It doesn't have to be pretty - just make sure it's located where visitors are able to notice it on site: List of safety precautions posted at the office building. Silva Jardim, Brazil.