Here are some things which each use as much water as a data centre:
A medium-sized office building
A golf course
A hotel
A leisure centre
A swimming pool
A large restaurant
A secondary school
A school
A small hospital
A shopping centre
A supermarket
A commercial laundry
A large bakery
A brewery
A dairy farm
A conference centre
A spa
A football stadium
An ice rink
A large theatre
A museum
A prison
A garden centre
A busy car wash