It is a common question, and almost embarrassing to admit that there is currently not a straightforward answer - at least not for a break down per building.
UCT has billing data from the City for the water meters on campus, but there are quite a few bits of data that don’t add up and require validation. The complexities that enter as a result of a very old campus mixed with continuous renovations and improvements are interesting, and something that the Properties and Services Department is working hard to improve. We would like to help, and you can too.
Omodayo Origunwa is an exchange student and his project involves mapping water use at UCT. He would need to verify his sourced data by taking readings of the water meters on campus ... sounds like an adventure, are you in?