Ushita Water Treatment Plant, Water treatment facility in Higashi-ku, Japan.

The Ushita Water Treatment Plant is a purification facility in Hiroshima that supplies clean drinking water to the city and surrounding areas. It uses several stages of filtration and chemical treatment to transform raw water into water safe for household use.

The plant opened in 1898 and was one of the first modern water supply systems in the city. Since then it has expanded and adapted its technology to meet growing demand and serve larger populations.

The plant was named one of the Modern Water Supply Hundred Selections, and in 2009 its buildings and documents were registered as Modernization Industrial Heritage. The site also holds a branch of the Kanda Shrine, moved here after the area became military land in 1889; its water basin supplies the water offering at the August 6 peace ceremony.

The plant sits on the left bank of the old Ōta River in the Ushita district, with the Gion Shindō road and the Astram Line running along its west side. The water museum on the grounds, housed in a 1924 pump house with a 1898 annex, opened in July 1985 and charges no admission. The former filtration basin with its brick shelter and granite walls stands unused.

Inside the grounds stand stone plaques inscribed by Prime Minister Itō Hirobumi and Lieutenant General Kodama Gentarō, who pushed through the 1895 imperial ordinance for the army waterworks, plus one by Postmaster-General Gotō Shinpei from a later visit. Kodama and Gotō, both key figures in Japan's rule of Taiwan, left their own handwriting here.