Juo dam in Ibaraki is one of the most contaminated dam because of Fukushima. (90km from Fukushima plant)
This is used to supply drinking water as well. This is the video footage of radiation measurement around the dam.
2.2 μSv/h was recorded. This is what you make your baby drink.
Please refer to this article as well..Reality in Fukushima
Iori Mochizuki