Colorado U.S Senator Michael Bennet, along with Senators Patty Murray (D-WA), Maria Cantwell (D-WA), Jeanne Shaheen (D-NH), Maggie Hassan (D-NH), Kirsten Gillibrand (D-NY), and Bob Casey (D-PA), wrote a letter to the Senate Appropriations Committee urging the Department of Defense (DoD) to investigate and clean up chemicals that have contaminated drinking water sources across the nation.