According to NRA (Nuclear Regulation Authority), Cs-134/137 density in Tokyo tap water is 24% higher than Fukushima.
The report was released on 10/30/2015, titled as “Readings of radioactivity level in drinking water by prefecture” to cover from July to September in 2015.
From this report, only 0.0015 Bq/Kg of Cs-137 was detected in Fukushima drinking water. Cs-134 was not supposed to be detected. On the other hand, 0.00036 Bq/Kg of Cs-134 and 0.0015 of Bq/Kg were detected from Tokyo drinking water.
The measurement of Cs-134 is due to Fukushima accident.
NRA comments each data is based on the reports from prefectures.
It is not mentioned by Fukushima prefectural government why Cs-134 was not detected in their drinking water.
Click to access 194_20151030.pdf