At the Fukushima Daiichi Nuclear Power Station we are enlisting the cooperation
of a great many people in order to move forward with countermeasures for contaminated water that was
generated in conjunction with the accident and contained high concentrations of radioactive substances.
Through this portal site we shall explain the current situation and give you data/information on treated
water* while also showing how we have removed the radioactive substances from contaminated water and reduced
Note on “Water treated with multi-nuclide removal equipment, etc.” is notated. (revised in March, 2020)
Treated water for which the sum of concentration ratios required by law, with the exception of tritium, is less than 1 is notated as either, “water treated with multi-nuclide removal equipment, etc.” or “treated water”, and treated water that has not been completely treated is notated as, “water treated with multi-nuclide removal equipment, etc. (for which the sum of concentration ratios required by law equals or exceeds 1)”. When referring to both of the aforementioned types of treated water collectively, the notation, “treated water*” is used.