The storage of contaminated water at Fukushima is not the only storage problem.

Contaminated soil from roads, farms, homes and woods in less contaminated areas- areas with annual doses of 50 millisieverts per year or less was promised by the end of fiscal 2013. The work is badly behind schedule. In the village of Iitate, only 3 percent of land scheduled for cleanup has been cleared.
There are no "mid-term" storage sites for the waste.

In an editorial in the Japanese daily, Mainichi, Sept. 12, 2913, it is recommended that methods other than decontamination be considered for the worst areas.

Current plans would permit people to return home if the dosage is 20 millisieverts or less per year, and to get the annual dose down to one millisievert per year level.

I have no idea as to whether these levels are safe.

http://mainichi.jp/english/english