The North Skunk River is flooding parts of Kellogg.
Early Sunday morning the city began taking on water. Crews started sand-bagging to save the water and sewer plants on the south side of town.
Dozens of homes now have several feet of water in their basements. City officials say parts of Highway 6 and Highway 224 will be closed on Monday.
So far there are no plans to evacuate residents, but they are under a boil advisory.
The DNR says the heavy rains have inundated drinking water wells, which could possibly contaminate them with bacteria. Any water used for drinking or cooking should first be brought to a boil for one minute.
To the south, the same river has put a boil order in place in the city of New Sharon. Mahaska County Emergency Management is asking residents to conserve and boil water until the pump station is restored.