One of the sites chosen for excavation at Lake Innes House comprised the bathroom, toilets and boiler room. Pipes running into this area suggest that both hot and cold water was piped here, with hot water coming from the boiler room. Among the artefacts recovered from this dig were fragments of a Wedgwood toilet bowl, which evidence suggests was connected to an underground waste-drainage system. Such complex drainage systems were uncommon in 1840s Australia, especially in country houses.