According to “Readings of radioactivity level in drinking water by prefecture” by Ministry of Education, Culture, Sports, Science and Technology, cesium contained in tap water of Tokyo is 4% higher than Fukushima.
Sampling date : July ~ September. 2012 Fukushima : Cs-134 0.0020 Bq/Kg Cs-137 0.0031 Bq/Kg Tokyo …… : Cs-134 0.0020 Bq/Kg Cs-137 0.0033 Bq/Kg