Septage or
septic tank sludge refers to the partially treated sludge stored in a
septic tank or (less commonly) in a
pit latrine. It is one type of fecal sludge. Septage is a by-product from the pretreatment of household wastewater in a septic tank where it accumulates over time. Septage is pumped out of a septic tank or
onsite sewage facility with a
vacuum truck. The septic tanks can be residential or non-residential. Non-residential sources can include wastewater from commercial/industrial development,
grease interceptor as well as other sources such as
portable toilet,
RV, and boat waste.