Record cesium level detected in Fukushima No. 1 groundwater; Tepco blames heavy rainfall

"A record 264,000 becquerels of radioactive cesium per liter has been detected in groundwater at the Fukushima No. 1 nuclear power station, Tokyo Electric Power Co. disclosed Saturday.

According to Tepco, recent heavy rains pushed up the levels of groundwater, causing it to reach soil containing highly radioactive water leaked earlier from the plant’s crippled reactors." Japan Times