Waste extraction system
From Memory Alpha, the free Star Trek reference.
"A good waste extraction system is important. Imagine where we'd be without one." - Rom
The waste extraction system, also known as the waste reclamation system, sewage and waste reclamation, or the sewer, was a plumbing system used to manage and process all bodily wastes aboard starships and starbases.
Quark once quipped to Worf that Klingon culture had ceremonies for everything except waste extraction. (DS9: "Looking for par'Mach in All the Wrong Places")
On Stardate 48892.1, the Doctor while in a malfunctioning holodeck program (he believed to be real life) requested a ship-wide system update and the computer reported, sewage and waste reclamation as one of them. At the time, it was presumably offline as with almost all other systems. (VOY: "Projections")
In 2373, Rom quit his job at Quark's to pursue a position working as a technician for the Bajorans. His first assignment was working the night shift on the Deep Space 9's waste extraction system. (DS9: "The Assignment")
Working in waste extraction was typically considered the least desirable posting for an engineer. (DS9: "The Assignment") After Enrique Muñiz called Miles O'Brien a "mountain man... an old mountain man", O'Brien asked him how he would like a transfer to Deep Space 9's waste extraction unit. (DS9: "The Ship") Another engineer, Pechetti, was previously assigned to waste extraction before volunteering to join the salvage team that "raided" Empok Nor. (DS9: "Empok Nor")
On Ferenginar, Rom and Quark's uncle Pax made a fortune in the waste extraction business. Coincidentally he was also known as "Uncle Stinky". (DS9: "Body Parts")
