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Marine Corps Air Station Futenma is seen from a park in Ginowan, Okinawa, April 19, 2019.

Marine Corps Air Station Futenma is seen from a park in Ginowan, Okinawa, April 19, 2019. (Carlos Vazquez/Stars and Stripes)

CAMP FOSTER, Okinawa — The inadvertent release of a banned pollutant in firefighting foam at Marine Corps Air Station Futenma created “minimal to no impact” on the environment, Marine officials said this week.

The incident occurred Dec. 5 when an auxiliary power unit in an aircraft hangar was inadvertently switched on, activating a fire suppression system, Marine Corps Installations Pacific spokesman 1st Lt. Tim Hayes wrote Wednesday in an email to Stars and Stripes. The system released an unknown amount of firefighting foam.

No injuries or property damage were reported.

“Approximately 99 percent of the … firefighting foam, and contaminated water has been contained and cleaned up,” Hayes said in the statement.

“The environmental team on site has determined that the environmental impact to the area is minimal to no impact, and there is no safety concern to the public” he said. “Proper procedures to prevent recurrence has been briefed to all military and civilian personnel regarding the use of the auxiliary power unit and other equipment in confined spaces.”

Japanese Defense Minister Taro Kono told reporters Tuesday that the foam contained perfluorooctanesulfonic acid, or PFOS, a synthetic, organic acid known known to cause tumors, increases in body and organ weight and death in animals.

PFOS and its sister acid, perfluorooctanoic acid, or PFOA, are found in firefighting foam, aircraft grease, water-repellant materials and fluorine chemicals.

Japan has no guidelines on safe levels of either chemical, but health advisories in the United States are issued for drinking water at levels of 0.07 micrograms per liter and above. Their manufacture and importation have been prohibited in Japan since 2010.

The chemicals are still in use in firefighting foam on U.S. military installations in Okinawa, but are being phased out, U.S. military officials have said.

The Okinawa Defense Bureau, which represents the defense ministry, said it was waiting for further details on the incident.

“Marine officials informed us that they cleaned the majority of the firefighting chemical foam from the facility and they did not see anything that spilled or leaked off base,” a bureau spokesman said Wednesday. “Marine officials said there is no concerns for the environment and they will retrain their people so that this won’t happen again.”

burke.matt@stripes.com Twitter: @MatthewMBurke1

ichihashi.aya@stripes.com Twitter: @AyaIchihashi

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Matthew M. Burke has been reporting from Okinawa for Stars and Stripes since 2014. The Massachusetts native and UMass Amherst alumnus previously covered Sasebo Naval Base and Marine Corps Air Station Iwakuni, Japan, for the newspaper. His work has also appeared in the Boston Globe, Cape Cod Times and other publications.

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