Mechelen-Zuid water tower

The Mechelen-Zuid water tower is a 143-metre-high (469 ft), combined water and telecommunications tower constructed in 1978. Since 1979, it has supplied the water to the city of Mechelen, Belgium, while also hosting television and telecommunications aerials. The concrete spire passes through a wide disc holding water fifty metres above the ground. Higher up, a smaller disc supports telecommunications equipment. Topped by a decorative stainless steel tube, it is claimed to be the highest water tower in the world.

Building data from Wikidata (CC0); heights normalised. Summary from Wikipedia (CC BY-SA).