Sewage is correctly the subset of wastewater that is contaminated with faeces or urine, but is often used to mean any waste water. "Sewage" includes domestic, municipal, or industrial liquid waste products disposed of, usually via a pipe or sewer or similar structure, sometimes in a cesspool emptier.
The physical infrastructure, including pipes, pumps, screens, channels etc. used to convey sewage from its origin to the point of eventual treatment or disposal is termed sewerage. In the past the word "sewage" also meant what is now called "sewerage". Possibly because of that, the word "sewerage" is often mistakenly used to mean "sewage".
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