Sewage

Driggs, Idaho, is west of the Grand Teton National Park.

The samples go to a wastewater epidemiology company in Massachusetts.

Wastewater tests found the park's arsenic levels were 40 times higher than those from Gardiner.

Irrigating lawns or gardens with water from the river, or allowing dogs to swim in the river, may also pose a risk to human health.

The spill has been contained and cleanup efforts are underway, according to a statement from Town Clerk Christine Trumbull.