Read the full article by Alex Wilson and Hana Kusumoto

“YOKOSUKA NAVAL BASE, Japan – The U.S. Navy has finished installing filters at the wastewater treatment plant on this base on Tokyo Bay, less than a week after the Japanese government once again reported high levels of so-called “forever chemicals” there.

Eight granular activated carbon filters to further treat wastewater contaminated with PFOS and PFOA were fully operational Tuesday morning at Yokosuka, homeport of the U.S. 7th Fleet, base spokesman Randall Baucom told Stars and Stripes by email.

The filters were installed specifically to remove the chemical compounds that since May have shown up repeatedly in water-quality tests by the U.S. Navy and the South Kanto Defense Bureau.

‘The U.S. Navy has worked hard to correct this situation. The health and safety of our service members, civilians, their families, and the local community is our top priority,’ Baucom wrote. ‘We are committed to learning from this experience and working to make improvements going forward.’

The Navy’s most recent round of testing on Sept. 29 found PFOA in concentrations of 12,900 parts per trillion in industrial wastewater, 258 times higher than the 50 parts per trillion limit imposed by the Japanese government, according to a Thursday news release from Yokosuka city.

U.S. Forces Japan, under the Japan Environmental Governing Standards, has a 50 parts per trillion limit on PFOA in drinking water but no established limit for wastewater.

Testing on non-industrial wastewater at the base also found PFOA at 11,700 parts per trillion, 234 times higher than the limit, according to the release. The Sept. 29 tests did not detect PFOS.

A separate test by the Japanese government of seawater at three points offshore of the naval base found 2.5 to 3 parts per trillion of PFOS and PFOA, well beneath 50 parts per trillion but above the 1.6 to 1.8 parts per trillion discovered June 30, the South Kanto Defense Bureau announced in a Thursday news release.

The Navy’s tests on Aug. 29 also found PFOA at the plant intake point at 11,100 parts per trillion. Discharged wastewater contained PFOS and PFOA at a combined concentration of 8,592 parts per trillion, the city said in the release.

‘The safety and security of residents is a concern, but the issue related to the environment and people’s health is also an important issue for those living at the Naval base and those working there,’ the release said. ‘We hope the cause is investigated and the issue is resolved as soon as possible.’

The Navy is investigating but has not yet identified the source of PFOA and PFOS on base, Baucom said in his email.” …