The Indiana Department of Environmental Management said preliminary samples taken from an iron discharge from the U.S. Steel Corp. Midwest Plant in Portage “do not indicate any health risks” for people who may come into contact with the water.

IDEM said preliminary results of samples collected by the U.S. Environmental Protection Agency show the reddish-orange discharge from the plant’s outfall was caused by high levels of iron, as U.S. Steel announced Tuesday.

The agency also said the discharge amount was below the levels allowed by U.S. Steel’s National Pollution Discharge Elimination System permit.

Beaches at the Indiana Dunes National Park remain closed for swimming, but the park itself is open.

IDEM said federal and state agencies are investigating environmental impacts, the cause of the discharge and possible Clean Water Act compliance issues.