If it is all radioactive iodine water, then nothing much as the half life is like 7-8 days. So unless you are taking fish from the ocean right in front of the facility and eating it on the boat...you are likely not to have any issues. If they are dumping any water with plutonium or cesium..that is another story all together.
From all the feedback I am getting on this Japan does not know what these people are really doing its more like what they want you to know. There are talks now of nationalizing the whole Japanese nuclear industry for better control.
7.5 million times legal limit of iodine found in seawater:
The operator of a damaged Japanese nuclear power station said Tuesday it detected 7.5 million times the legal limit of radioactive iodine in seawater collected near a cracked concrete pit at the plant. Ref. Source 2
Vincenzo, are you ready to move from the region? I think they are hiding more than they are letting on:
Water leaked at Japan's Onagawa nuclear plant
Local Japanese News In English
Water leaked out of spent fuel pools at the Onagawa nuclear plant in northeast Japan after a strong aftershock rocked the region late on Thursday, but there was no change in the radiation levels outside the plant, operator Tohoku Electric Power said on Friday.
It said water sloshed out of spent fuel pools in the plant's No.1, No.2 and No.3 reactors which had been shut down after the 9.0 magnitude quake on March 11, and had also leaked in three other locations in the No.3 reactor complex. (Reuters)
Source: News On Japan
Japan's Nuclear Volcano Erupts
By Mike Whitney
Conditions at the stricken facility have steadily deteriorated and now the station is intermittently spewing lethal amounts of radiation into the atmosphere and around the world. A French nuclear group has warned that children and pregnant mothers should protect themselves from the fallout. Ref. Source 1
Japan's nuclear cover-up:
It is not nuclear technology as such that presents the danger, but the social and economic order under which it has developed. If nuclear power remains in the hands of private corporations and under the domination of the capitalist market, the environment and public health and safety will inevitably be subordinated to the drive for profit. Ref. Source 3