Most large apartments like Buzzoto don't give itemized readouts. You don't pay DC Water directly. Buzzoto gets one big bill for the whole building and each resident pays a portion of it through a submetering contractor like conservice (their name is quite fitting based on my interactions with them!). How that bill is divided is up to them.

We lived in a building managed by Kettler for a while. Apparently there was some kind of mixup in estimated billing vs actual readings and the building owed DC Water a large backpay of money. That debt got evenly divided to current residents whether you lived there during the high usage period or not.