| Specification | Grey Water | Sewage Water |
| Definition | Grey water is the waste water that drains from washing machines, kitchen, bathtubs and bathroom (shower). | Sewage water also known as blackwater, is wastewater from toilets and bathrooms that contains faeces and urine. It contains high levels of pathogens and oil & grease contamination. |
| Contamination Level | Grey water contains low levels of contaminants, thus making it easier to treat. | Sewage water contains higher level of contamination due to presence of disease-carrying bacteria. |
| Reuse Applications | Recycled grey water is used in irrigation, flushing toilets, cleaning cars & floors and constructed wetlands. | Recycled black water can only be used as plant fertilizer. |
| Type of Contamination | Usually contaminated with chemicals and no sewage. | Highly contaminated with sewage content rich in organic matter and nutrients. |
| Source | Bathrooms, shower or washing machines | Kitchen sinks & toilets |
| Treatment | Sand filtration and controlled wetlands can treat such wastewater. | Biological, chemical and Disinfection treatment processes are required. |
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