MADISON, Wis. -- Madison's water utility has shut down one of its 23 wells after high levels of metal were found in some Nakoma residents' tap water.

Residents on Mohawk Drive complained of brown water, prompting city officials to run tests.

The well in question has serviced an estimated 10,000 homes and has been found to have elevated levels of manganese, a naturally occurring metal found in many wells.

Manganese is actually good for the body in small doses, but can be toxic in very high quantities.

David Denig Chakroff, the water utility's general manager, said tests have not found anyone to be in danger.

"It's not considered a health concern by any federal or state standard, but it's certainly a nuisance because if the levels are high enough it can cause cloudy dark water, which can stain clothes and basically be unaesthetic," said Chakroff.

He said because of concerns, plans to replace water pipes in the neighborhood have been moved up a year with work starting next summer.