A new water tower found under Decor / Misc. Decor, costs 0.
1. With World Editor create a 10x10 lot on flat terrain. Change the lot type to Community, no visitors allowed.
2. Place the tower on the new lot.
3. Save the new lot with the tower to the library.
4. Create a 10x10 lot on the top of a hill. Change the lot type to Community, no visitors allowed.
5. Grab the lot with the tower from the library and place it on the empty lot on the hill.
6. The lot with the tower will be flat.
7. Delete the original lot on the flat terrain.
Vitoria water tower (MediaFire)