Freshwater pollution

Graphic shows number of sites removed from EPA’s National Priorities List of contaminated sites since 2001; 2c x 5 1/2 inches; 96.3 mm x 139 mm;

In this Dec. 11, 2017 photo, men in protective clothing work at the Martin Aaron Inc. Superfund site in Camden, N.J, Monday, Dec. 11, 2017. Hundreds of the nation’s most polluted places are at an increasing risk of spreading contamination beyond their borders by more frequent storms and rising seas. An Associated Press analysis of flood zone, census and EPA data shows that almost 2 million people live within a mile of more than 300 at-risk toxic sites, mostly in low-income, heavily minority neighborhoods. These sites span the nation, but Florida, New Jersey and California have the most. (AP Photo/Matt Rourke)

FILE - This Feb. 13, 2017, aerial file photo shows a site where the final phase of the Dakota Access Pipeline near the Missouri River took place with boring equipment routing the pipeline underground and across Lake Oahe to connect with the existing pipeline in Emmons County in Cannon Ball, N.D. A federal judge on Monday, Dec. 4, 2017, ordered the Army Corps of Engineers and pipeline developer Energy TransFer Partners to complete an oil spill response plan for a section of the pipeline beneath the Missouri River in North Dakota. (Tom Stromme/The Bismarck Tribune via AP, File)

FILE - In this Aug. 12, 2015 file photo, water flows through a series of retention ponds built to contain and filter out heavy metals and chemicals from the Gold King mine chemical accident, in the spillway about 1/4 mile downstream from the mine, outside Silverton, Colo. The administration of President Donald Trump is dropping a proposal that would have forced mining companies to prove they have the financial wherewithal to clean up their pollution, Friday, Dec. 1, 2017. (AP Photo/Brennan Linsley, File)

In this Sept. 3, 2017 photo, algae covers the surface of Maumee River at the mouth of Lake Erie in Toledo, Ohio. The type of phosphorus fueling the algae outbreak has doubled in western Lake Erie tributaries since the Environmental Quality Incentives Program started in the mid-1990s, according to research scientist Laura Johnson of Ohio’s Heidelberg University. Scientists estimate about 85 percent of the Maumee’s phosphorus comes from croplands and livestock operations. (DroneBase via AP)

FILE - In this Oct. 13, 2016, file photo, a cow skull is wired to a fence post in front of a hamlet destroyed by a mudslide triggered by the Nov. 5, 2015 failing of a dam holding back a giant pond of mine waste in Paracatu, Brazil. The UN environment program says a string of mining waste disasters — some deadly — over the past decade show better protections are needed for communities downstream of massive polluted material storage sites. (AP Photo/Leo Correa, file)