BILLINGS, Mont. (AP) — A Montana water and sewer district contends Yellowstone National Park officials are dragging their feet on fixing a problem with arsenic infiltrating its sewage treatment system.

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The Gardiner-Park County Water and Sewer District has filed a lawsuit against the National Park Service, Yellowstone and others. The suit was filed Wednesday in U.S. District Court in Billings.

The Billings Gazette reports that the Montana district accuses the Park Service of negligence, creating public and private nuisances, breach of contract and trespass.

The Gardiner-Park County district borders Yellowstone and treats sewage that originates in the north part of the park.

The case is assigned to U.S. Magistrate Judge Timothy Cavan.

Yellowstone spokeswoman Morgan Warthin says the U.S. Department of the Interior is reviewing the lawsuit.