Toxic levels of U.S. military poison found in Okinawa's water

According to the Asahi Shimbun article:
The U.S. military initially reported that the level of PFOS in the water was under 2.7 nanograms per liter.
However, a check of the water found the number of PFOS to be at 670 nanograms per liter, which is a highly toxic level.
The amount of foreign substances in water should be kept under 50 nanograms per liter, according to guidelines. 

​宜野湾市下水から指針超PFAS 米軍放出後1リットル数百ナノグラム