"Federal public health officials are urging people to take precautions to protect themselves against a microscopic parasite that can live for days in swimming pools and water playgrounds and cause severe intestinal problems."

"The explosions that destroyed part of the historic oil refinery on Philadelphia's south side have thrown a wrench into the ongoing effort to clean up decades' worth of soil and water pollution at the site."

"Ten U.S. states and Washington, D.C. sued the Environmental Protection Agency to begin working on rules to tighten oversight of asbestos, and reduce the health risks that the substance poses to the public."

"A Texas federal judge has found a huge Formosa plastics complex northeast of Corpus Christi to be a 'serial offender' with a history of allowing plastic pellets to wash into wetlands and bays along the Gulf of Mexico, and said that the company has committed 'enormous' violations of state law and the U.S. Clean Water Act."

"Oregon will tighten safety standards for railroads transporting large amounts of crude oil."

"Michigan Attorney General Dana Nessel filed a lawsuit in Ingham County Circuit Court on Thursday that seeks to decommission the Enbridge Line 5 oil pipeline across the environmentally sensitive Straits of Mackinac."

"Wisconsin wastewater plants were built to keep pollutants out of the environment, but state regulators have come to realize the facilities may be spreading hazardous industrial chemicals in ways that increase health risks."

"Lake Erie’s Sandusky Bay is already struggling with a species of toxin-producing algae, another sign that the rest of the lake’s western basin is likely headed for another massive bloom this summer."

"Thirty-six railroad cars full of coal went off the tracks early Tuesday and landed in the Great Dismal Swamp, officials said Wednesday."

"The Senate passed a defense bill Thursday that would require an increased response from the government to harmful chemicals that have leached into water in at least 43 states."