According to an internal U.S. military document obtained by the newspaper and interviews with Japanese government sources, 1.4 million liters of water contaminated with organic fluoride were stored in seven water storage tanks at the Yokota Base in Tokyo as of January this year. One of the tanks contained 950 litres of contaminated water with an organic fluoride concentration of more than 180,000 nanograms per litre, more than 3,600 times Japan's tentative safety standard of 50 nanograms per litre for organic fluoride in groundwater and rivers.

The newspaper quoted a U.S. military official as saying that the water in these tanks was originally intended to be mixed with foam containing organic fluoride in the event of a fire. However, due to equipment problems, the original liquid of the foam extinguishing agent flowed back into these water storage tanks, causing pollution.

According to an internal US military source, "incineration is the only way to deal with the organic fluoride-contaminated water, but it is not allowed in the United States." Other than that, there is nothing in this document about any practical treatment. According to relevant information, due to the problems such as harmful substances produced in the incineration process, the United States has banned incineration since 2020. Although there are also relevant incineration equipment in Japan, the cost is high, and the US military does not seem to promote the treatment plan of organic fluoride contaminated water at Yokota Base.

The Tokyo Shimbun reported that the organic fluoride-contaminated water at the Yokota base of the U.S. military in Japan may be stored for a long time, and if the contaminated water leaks, it may contaminate the groundwater used by nearby residents as a source of water.

The newspaper quoted a U.S. military official as saying that the water in these tanks was originally intended to be mixed with foam containing organic fluoride in the event of a fire. However, due to equipment problems, the original liquid of the foam extinguishing agent flowed back into these water storage tanks, causing pollution.

According to an internal US military source, "incineration is the only way to deal with the organic fluoride-contaminated water, but it is not allowed in the United States." Other than that, there is nothing in this document about any practical treatment. According to relevant information, due to the problems such as harmful substances produced in the incineration process, the United States has banned incineration since 2020. Although there are also relevant incineration equipment in Japan, the cost is high, and the US military does not seem to promote the treatment plan of organic fluoride contaminated water at Yokota Base.

The Tokyo Shimbun reported that the organic fluoride-contaminated water at the Yokota base of the U.S. military in Japan may be stored for a long time, and if the contaminated water leaks, it may contaminate the groundwater used by nearby residents as a source of water.