"TORONTO -- More than a decade after the Walkerton disaster, much of Canada's tap water remains at risk from contamination despite initial progress in front-line monitoring and treatment, a new report concludes."

"NEW ORLEANS -- BP has lost two big rulings in its fight to shield itself from potentially having to pay billions of dollars more in damages related to the worst offshore oil spill in U.S. history."

"A Coast Guard admiral who led the government's response to the Deepwater Horizon disaster is taking over as the nation's chief overseer of offshore drilling safety, the Obama administration said Monday. Rear Adm. James Watson begins his post as director of the Interior Department's Bureau of Safety and Environmental Enforcement on Dec. 1."

"Oil and gas drillers who pollute groundwater, spill toxic chemicals or break other rules have little to fear from the inspectors and agencies regulating the surge in American petroleum production."

"A coalition of clear air advocates and the U.S. Environmental Protection Agency have filed a legal settlement that establishes firm, enforceable deadlines for action on plans to clean up regional haze pollution in 43 states, the District of Columbia, and the Virgin Islands."

"Nebraska and TransCanada Corp reached a deal on Monday that will see the state pay for environmental studies on a new route for the $7 billion Keystone XL pipeline that steers clear of the environmentally sensitive Sand Hills region and the Ogallala aquifer."

"The cleanup of toxic chemicals dumped during the production of carbonless copy paper in the 1950s and 1960s has been happening in the lower Fox River since 2009, but it's still unclear who is going to pick up the tab."

"LAKELAND -- A hulking mountain of ash sitting inside the Lakeland city limits isn't exactly a point of pride, but city officials would rather see it stay than go."