Mud from water purification plants in Tokyo is highly contaminated.
The plants produce drinking water for Tokyo people.
On 8/14/2012, bureau of waterworks Tokyo metropolitan government released their radiation measurement result.
The samples were taken 7/23 ~ 8/2/2012.
The highest reading was 500 Bq/Kg (Cs-134/137) from Misato Purification Plant, the second highest reading was 490 Bq/Kg from Kanamachi Water Purification Plant.[Link]
Kanamachi water purification plant is 211km away from Fukushima plant, but 3/28/2011, they measured 88,400 Bq/Kg of Iodine-131 and 14,650 Bq/Kg of Cesium-134/137 from the mud.[Link]
The mud is discharged to Tokyo Bay to for reclamation work.
Iori Mochizuki