As is the case in many other areas of this nation, we live in a flat area and our water pressure is provided via water towers that are set up throughout the area. This one is my municipality's water tower. The police car running a speed trap near where I parked to take the photo was momentarily interested in my activity, but then went back to manning his radar gun. I guess I'm not that interesting after all - LOL.
The tower itself is quite large and tall. Water towers in the area are all varied and taller buildings are required to have their own water towers on their rooftops (or were required to have them in the past. I'm not 100% sure that requirement is still extant).