Military officials say Thursday the two wells near Wheeler-Sack Army Airfield will be shut down immediately.
Post officials say the detected levels of perfluorooctanoic acid, or PFOA, are well below the government's health advisory levels. But they still decided to shut off the wells and replace the supply with water provided by an existing supply contract.
Army officials say the likely source of the chemical are foams formerly used to suppress aircraft and fuel fires during firefighting exercises and actual emergencies.
Earlier in March military officials said they planned to test 664 sites nationwide where the foam was used in fire or crash training.