Documents released via MuckRock under the Freedom of Information Act (FOIA) reveal that lax safety standards at the largest USAF base in the Pacific may be to blame for recent contamination of drinking water sources on Okinawa.

The internal reports expose a spate of accidents at Kadena Air Base during the past 15 years which have leaked at least 21,000 liters of fire extinguishing agents - some of them toxic.

On December 4, 2013, one accident - blamed on a switch and module malfunction - spread 2270 liters of fire extinguishing agents out of an open hangar and into storm drains on Kadena Air Base.

In one incident last May, described by base officials as "vandalism", a drunk Marine activated a fire-fighting system.1 It filled a hangar with more than 1500 liters of JET-X 2.75% - a foam, classified by the U.S. government as hazardous, which contains chemicals known to cause cancer, neurological and reproductive disorders. Although the agent flowed off the base into nearby waterways and the ocean, military officials decided not to report the leak to Japanese authorities or local residents. Nor did they alert GIs or Okinawan employees on the base to the dangers.

In a statement to the military newspaper, Stars and Stripes, a USFJ spokesperson appeared more concerned about damage to aircraft than human health. "Kadena's capabilities and readiness have not suffered," quoted the newspaper.2

Other incidents at Kadena Air Base included the escape of approximately 17,000 liters of agent during a three-day period in 2001, attributed by base officials to mechanical malfunctions.3 Further leaks between 2012 and 2014 totaled more than 3400 liters. One was blamed on malfunctioning equipment; another on mechanical and electronic malfunctions. A third incident which spilled 1135 liters was recorded as "operator error."4

The revelations appear to confirm Okinawan suspicions that the base has been polluting the local water system.

In January, Okinawan authorities announced that high levels of perfluorooctane sulfonate (PFOS) - an ingredient found in many fire extinguishing agents - had been discovered in waterways near the Kadena base. The area supplies drinking water to seven municipalities, including the prefectural capital, Naha.5

According to an announcement from the Okinawa Prefectural Enterprise Bureau on January 18, tests conducted between February 2014 and November 2015 recorded maximum PFOS levels of 80 nanograms per liter (ng/L) at its Chatan Purification Plant, rising to 1320 ng/L in Dakujaku River which is fed by water from the base. The bureau also noted that readings from a well within the installation had measured 1870 ng/L in 2008.6

The U.S. Environmental Protection Agency categorizes PFOS as an "emerging contaminant" that is readily absorbed by oral ingestion, accumulating in the blood, kidneys and liver. It does not break down easily in the environment or the human body where it has a half-life of up to 9 years.7

Due to concerns that PFOS can lead to reproductive and developmental problems, in 2009 the EPA set a provisional health advisory limit for drinking water at 200 ng/L for short-term exposure. Although the Japanese government has not yet set any specific limits, it has fundamentally prohibited the production and usage of PFOS-containing products since 2010.8

The bureau noted that PFOS levels discovered near Kadena Air Base are far higher than on mainland Japan where, in the past ten years, they have only been recorded at a maximum of 22 ng/L.

On January 21, Okinawa prefecture asked the Okinawa Defense Bureau to seek permission from the U.S. military to access Kadena Air Base to check for sources of contamination.9 Last year, Japan and the U.S. signed an environmental agreement which theoretically grants Japanese authorities the right to visit military installations in the case of chemical spills.10 The Kadena contamination issue may serve as a test-case for the viability of the new agreement.

Three weeks after the request to access the base, USFJ had not yet responded to whether Okinawan officials would be granted access to the installation.

The FOIA documents highlight the shortcomings of Japan Environmental Governing Standards (JEGS), the guidelines regulating contamination on U.S. bases in Japan.11 While JEGS require the U.S. military to notify the Japanese government immediately when "a significant spill... threatens the local Japanese drinking water resource", the decision on whether to categorize a spill as "significant" or not is often left at the discretion of the U.S. military.

In the case of the drunk Marine's dump of the carcinogenic agent last year, correspondence suggests that base officials at first mistakenly identified the chemical as "non-toxic".12

By the following month they had recognized it as hazardous and they were aware it carried warnings that it should not be released into the environment. However, even though the agent had entered nearby waterways and the sea, because the names of its component ingredients were not listed in the JEGS table of hazardous chemicals, base staff decided there was no requirement to report the accident to the Japanese government.

Emails also show that base officials believed rainfall would dilute the agent and, because the incident occurred at night, it was "highly unlikely to draw any public notice because the foam would disipate (sic) before morning."

According to the correspondence, there had been four previous spills of the same foam, some of which also went unreported.

When the news was initially reported on the front page of The Japan Times on February 9, 2015, media on Okinawa were quick to follow up. The story made the headlines of the Okinawa Times and topped the TV news.13 However, Tokyo-based Japanese media failed to cover the story

The way in which Kadena Air Base informed service members of the discovery of PFOS in the local water has also come under fire. On January 24, in a letter addressed to "Team Kadena", base officials told those living on the base that, although PFOS had been discovered in local drinking water, "Be assured that your drinking water is safe."14

Dr Kawamura Masami, director of Citizens' Network for Biodiversity in Okinawa, accused the military of playing down the risks.15 They failed to inform service members of the high levels found in nearby waterways, she says, and they appeared to mislead base residents by telling them that Okinawa Prefecture agreed that local water was safe to drink. Nor did they cite the air base itself as the source of contamination.

Ikeda Komichi, adviser at Environmental Research Institute Inc., Tokyo, agrees with Kawamura's assessment of the risks.

"Although there are no regulations yet in Japan, there is growing evidence that these are high-risk chemicals. They are stable compounds that do not break down easily so they can accumulate in the body. They also bio-accumulate and they show signs of long-term toxicity."

Kawamura urged base officials to inform USAF service personnel and their families of the potential risks to their health. She also likened Kadena's response to its handling of the discovery of dioxin-tainted barrels near two base schools in 2013. In that case, too, the military appeared to put political priorities ahead of the health of American families.16

Sato Manabu, professor of political science at Okinawa International University, also called upon local and national officials to take action.

"Okinawa prefecture and municipalities near the base should conduct an independent investigation into the leaks. Moreover, the Japanese government should require the U.S. military to notify it of any potentially harmful leakage - regardless of the amount. To decide the significance of a leak should not be left up to the U.S. military," he said.

This is a revised and expanded version of an article which first appeared in The Japan Times on February 9, 2016.

Recommended citation: Jon Mitchell, "FOIA Documents: Drunk US Marine's 2015 dump of toxic foam among accidents polluting Okinawa water supply", The Asia-Pacific Journal, Vol. 14, Issue 7, No. 3, April 1, 2016.

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