Camp LeJune military base shut down one of its water treatment plants after mercury was found in a pipe.
It's not clear how much mercury was discovered or what was its source.
Crews are now working to make repairs.
Camp LeJune has been under fire for tainted water.
This year, the president signed a special act into law that will give health care for Marines and their families made sick by the water between 1957 and 1987.
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