Sustainable sanitation manual and construction guidelines for a waterless composting toilet / by Leonie Crennan
Sewage is used water, or the "waste water" that comes from the toilet, or from household cleaning activities such as dishwashing, clothes washing, cleaning the house, or cleaning a boat or motorbike. Waste water can be harmful to the environment and to your health. It is harmful to the environment because it can contain high levels of nutrients (from faeces, urine, detergents) and other chemicals. It is harmful to your health because it can contain disease-causing organisms called pathogens.