A bipartisan group of Western senators is seeking to hold the Environmental Protection Agency accountable for the financial harm it caused last year by spilling millions of gallons of toxic wastewater from the Gold King Mine in Silverton, Colo.

The lawmakers introduced an amendment Monday to a massive water infrastructure bill being considered on the Senate floor. The spill measure would address all outstanding costs associated with the 3-million-gallon spill that sullied the waterways of three western states.