Radioactive Material Monitoring in and around Fukushima Prefecture (Public Water Areas)

Radioactive material monitoring was conducted at rivers, lakes and coastal areas in Miyagi, Ibaraki and other Prefectures, centered on Fukushima Prefecture, where contamination with radioactive materials was suspected.

In FY2023, monitoring covered 602 locations and analysis was conducted for radioactive cesium and strontium in water, etc.

Monitoring results of radioactive cesium concentrations in water are as follows.

[Monitoring results of radioactive cesium concentrations in water]

River water samples (2,007 samples): Radioactive cesium concentrations were all below the detection limit.

Lake/reservoir water samples (1,377 samples): Radioactive cesium concentrations were all below the detection limit except for those in 10 samples collected at 2 locations* in the Hamadori District.

Coastal samples (534 samples): Radioactive cesium concentrations were all below the detection limit.

• At all locations where radioactive cesium was detected, amounts of suspended solids (SS) and turbidity were relatively large.

• Included in this reference material on March 31, 2013
• Updated on March 31, 2025