- This data was created based on the survey results at rivers, lakes, and water sources. The survey results were obtained from the "Monitoring Results of Aquatic Organisms" released to the public in the Ministry of the Environment website.
- In this monitoring, concentrations of radioactive cesium and radioactive strontium in water at public waters including river, lake, water source, and shore in Miyagi Prefecture and Fukushima Prefecture were measured.
- The data consisted of measurement results from December 2011 to December 2016.