- Associated Press - Friday, November 13, 2015

SHELDAHL, Iowa (AP) - The central Iowa city of Sheldahl has issued a bottled water advisory after testing found concentrations of nitrate more than twice the maximum level considered safe.

The Iowa Department of Natural Resources says officials issued the advisory Friday after the DNR found nitrate levels of just over 2 milligrams per liter of water. The sample was taken Nov. 4 but a laboratory didn’t notify the DNR within 24 hours as required.

The city is flushing its water system. The DNR is conducting additional tests.

The water is considered safe for adults and children older than 6 months but can be dangerous for younger children.

The DNR didn’t identify the cause of the problem, but high nitrate levels have been a persistent problem, in part because of fertilizer runoff from farms.

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