A contractor rebuilding a Cobb County water treatment plant broke a water main there Monday, causing water pressure issues for the eastern part of the county.

The water pressure issue lasted about 30 minutes, but county spokesman Ross Cavitt said at 11 a.m. that some people might still have discolored water. If that’s the the case, he said, then they should run cold water until it goes away.

“Since the system never completely lost pressure we do not believe any sort of boil water advisory will be needed,” he said.

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The break is on a 30-inch-wide line at the Quarles Water Treatment Plant, which is located off Lower Roswell Road.

The issues were mostly in the Pacey Ferry, Windy Hill and Cumberland areas, Cavitt said.

The plant is under the Cobb County-Marietta Water Authority. It was the authority’s first water treatment plant and was built in 1952.

It treats 86 million gallons a day from the Chattahoochee River, according to the CCMWA website.

The contractor was there to help the demolition and rebuild of the plant. The contract for the project is valued at $71 million, according to the budget.

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