|Ground-floor boys' toilets|
There were boys' toilets on the ground floor of Hogwarts Castle.
Peeves, the Castle's resident Poltergeist, was allowed to a "once-weekly swim" in these toilets, under the terms of a contract drafted in 1876 by Headmistress Eupraxia Mole, on behalf of the school.
- Pottermore (Mentioned only)
Notes and references