Hazardous substances detected at Yokosuka US Naval Base About 172 times more than Japan's guidelines
September 30, 2022 22:11
Organic fluorine compounds, which have been pointed out to be harmful, were detected in May and July this year from the drainage of the US Navy base in Yokosuka City, Kanagawa Prefecture. When the US military investigated again, it was found that it was detected at a concentration 172 times higher than the Japanese guideline, which greatly exceeds the previous figures.
In May and July of this year, at the wastewater treatment facility at the U.S. Navy Yokosuka Base in Yokosuka City, 50 nanograms per liter of organic fluorine compounds, PFOS and PFOA, which have been pointed out to be harmful, is the government's provisional guideline value. was detected at a concentration about twice as high as the national provisional guideline value of 50 nanograms per liter.
According to the city, on the 29th of last month, when the U.S. military conducted the third survey, it was about 172 times the guideline value for domestic wastewater treatment facilities, and about 109 times the guideline value for industrial wastewater treatment facilities. This means that the concentration was significantly higher than the previous figures.
In addition, the US military reportedly told the Ministry of Defense that it will install activated carbon filters that absorb harmful substances in wastewater treatment facilities in November.
Through the Ministry of Defense, Yokosuka City asked the US military to investigate the cause, install an activated carbon filter as soon as possible, and stop draining water into the sea until it is installed.
It also calls on the government to conduct on-site inspections of bases and studies of impacts on fisheries.