|World(s)||Mad Monster Mansion|
The Sewage Tank is an area inside Loggo the toilet in Mad Monster Mansion. Only Pumpkin Banjo can enter to get the Jiggy. There are enemies such as Whiplash and Grille Chompa that cannot be killed inside it due to players being unable to go into the revolting area without the pumpkin transformation.
The Sewage Tank can be accessed from The Bathroom, by jumping into Loggo's bowl as Pumpkin Banjo.
Interestingly, after the player gets the Jiggy from this area and leaves, Grunty will say "I can't believe you went in there! Wash you hands now, filthy bear!" This implies that going through the septic tank of a toilet is not something that Grunty does despite her otherwise disgusting habits.