The Kanagawa Prefectural Board of Education said Friday that high levels of radioactive cesium had been found in tanks at 18 schools in Yokohama.
According to the board, 44 schools in the city use rainwater for flushing toilets. The rainwater is first stored in underground tanks.
Between last November and December, the city checked the sludge in the underground tanks and found radioactive cesium measuring more than 8,000 becquerels per kilogram at 18 schools.
A junior high school in Tsurumi Ward measured 16,800 becquerels, which was the highest level of cesium found in the schools.
Yokohama city officials said they are going to stop recycling rainwater for toilets from now.© Japan Today