(Posted March 25, 9 a.m. JST) The United States Government advises American citizens that, in accordance with guidelines that apply to water in the United States and based on analysis of tap water samples for radioactive iodine on March 24, 2011, the water in Tokyo is safe for drinking. U.S. Government officials are consulting with health experts and radiation experts, in both the United States and Japan, and are continuously monitoring the situation.
The US also states that the radiation levels in Tokyo are not hazardous to our health.
Q: Radiation levels are increasing in the Kanto area, according to the media. Are we going to be okay?
A: "Ten or a hundred times higher amounts of radiation than the normal background level" sounds very abnormal, but the fact is that it is still not hazardous to our health. Radiation levels observed at Tokyo, Tochigi, Gunma, Chiba, Kanazawa, Yamanashi and Shizuoka prefectures between 9am and 5pm on March 15 is 1 micro Sievert per hour at the highest. If we were continuously exposed to this level for one year, the total radiation level would be almost the same level as one CT scan you have in the hospital, so clearly this level is not hazardous to our health. Moreover, this level of radiation (1 micro Sievert per hour) is not likely to continue. 
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