- Associated Press - Wednesday, January 26, 2011

LARGO, Md. (AP) — A boil water advisory remains in effect for about 400,000 people in Prince George’s County as public works officials continue to test the water quality after a massive pipe burst.

The Washington Suburban Sanitary Commission says results from the first round of water samples are expected later Wednesday. A second set of samples also will be taken Wednesday afternoon.

Officials have said the boil advisory will remain in effect until two sets of water samples test negative for contamination. It will take at least 18 hours to receive the second set of results.

The water main break on Monday iced over part of the Capital Beltway in Maryland, snarling traffic and swamping parked cars.

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Boil Advisory Map: http://www01.wsscwater.com/emap/