Freshwater pollution

This Saturday, Nov. 30, 2019, photo shows the road closed near Bar X road and Tonto Creek after a vehicle was washed by flood waters in Tonto Basin, Ariz. Rescuers with helicopters, drones, boats and dogs searched Sunday for a 6-year-old girl missing since Friday, when a truck she was in was swept away while attempting to cross an Arizona creek swollen by runoff from a powerful storm. (Patrick Breen/The Arizona Republic via AP)

In this image made from Friday, Nov. 29, 2019, video provided by KNXV-TV, emergency personnel and law enforcement members gather while searching people including children after a vehicle was swept away while attempting to cross a runoff-swollen creek in Tonto Basin, northeast of Phoenix. Authorities said Saturday they have found the bodies of a few young children. (KNXV-TV via AP)

Brittany Culp brushes snow off of her windshield on a windy and snowy morning in Greeley, Colo., Saturday, Nov. 30, 2019. The weather caused the city to cancel its annual Greeley Lights the Night parade, which was scheduled in the evening. (Alex McIntyre/The Greeley Tribune via AP)

FILE - In this July 27, 2018 photo, the Dave Johnson coal-fired power plant is silhouetted against the morning sun in Glenrock, Wyo. The Trump administration is proposing easing more Obama-era protections on contaminants from coal-fired power plants. Environmental Protection Agency administrator Andrew Wheeler signed a proposal Monday overhauling a 2015 rule on release of contaminated wastewater from power plants. The EPA says the change will save $175 million annually in compliance costs.(AP Photo/J. David Ake)

Environmental Protection Agency Administrator Andrew Wheeler, right, signs a document in front of Assistant Secretary of the Army for Civil Works R.D. James to revoke the Waters of the United States rule, an Obama-era regulation that provided federal protection to many U.S. wetlands and streams, Thursday, Sept. 12, 2019, in Washington. (AP Photo/Patrick Semansky)

Environmental Protection Agency Administrator Andrew Wheeler, right, signs a document in front of Assistant Secretary of the Army for Civil Works R.D. James to revoke the Waters of the United States rule, an Obama-era regulation that provided federal protection to many U.S. wetlands and streams, Thursday, Sept. 12, 2019, in Washington. (AP Photo/Patrick Semansky)

FILE - This undated file photo shows Barrick Goldstrike Mines' Betze-Post open pit near Carlin, Nev. A three-judge panel with the U.S. Court of Appeals for the District of Columbia ruled Friday, July 19, 2019, that state and federal programs ensure mining companies take financial responsibility for their pollution. (Adella Harding/The Daily Free Press via AP, File)

Water flows through Conowingo Dam, a hydroelectric dam spanning the lower Susquehanna River near Conowingo, Md., on Thursday, May 16, 2019. Officials once counted on the dam to block large amounts of sediment in the Susquehanna from reaching Chesapeake Bay, the nation's largest estuary, but the reservoir behind the dam has filled with sediment far sooner than expected. (AP Photo/Steve Ruark)

In this June 3, 2017 photo, Dr. Joan Perry of Kinston, left, answers a question during a debate with and state Rep. Greg Murphy, a Greenville physician, in Greenville, N.C. The two Republicans are running in a special primary election to be held July 9 for North Carolina's 3rd Congressional seat. (Deborah Griffin/The Daily Reflector via AP)