Remember that time you were thinking, “I wonder how the magical folk of J.K. Rowling’s Harry Potter wizarding world go to the bathroom?”
Kidding. OF COURSE you’ve never wondered such a thing. Or, if you did, you’ve never told anybody about the bizarre questions you ask of the minutiae of the life of wizards in your private time.
(It’s cool. We won’t judge.)
Luckily for those who are curious about such matters (and admit it, now that we’ve mentioned it you kind of want to know, right?), the creator of the series has revealed all.
In a piece published to Pottermore about the Chamber of Secrets, J.K. Rowling confirmed that before wizards discovered the Muggle invention of pipes, they simply… relieved themselves on the spot.
When first created, the Chamber was accessed through a concealed trapdoor and a series of magical tunnels. However, when Hogwarts’ plumbing became more elaborate in the eighteenth century (this was a rare instance of wizards copying Muggles, because hitherto they simply relieved themselves wherever they stood, and vanished the evidence), the entrance to the Chamber was threatened, being located on the site of a proposed bathroom.
Yes, you read correctly. They "simply relieved themselves wherever they stood, and vanished the evidence".
While we can see how "vanishing" waste is a little more environmentally friendly than flushing it down into waterways, there's bound to be a few moments when someone...notices... your mess, right?
Either way, it's something we've certainly never thought about when daydreaming about our own letter from Hogwarts arriving by owl mail. (Ahem, I'm still waiting, Rowling...)
But now that the author herself has told us, it's something we're never going to be able to forget.