"Citgo Petroleum Corp. reached an agreement with New Hampshire to be dismissed from an $816 million trial over groundwater contamination while a settlement is completed, as a witness testified that 2 percent of the state’s private wells are polluted with hazardous levels of the chemical MTBE."

"WEATHERFORD, Texas -- When a man in a Fort Worth suburb reported his family's drinking water had begun "bubbling" like champagne, the federal government sounded an alarm: An oil company may have tainted their wells while drilling for natural gas. At first, the Environmental Protection Agency believed the situation was so serious that it issued a rare emergency order in late 2010 that said at least two homeowners were in immediate danger from a well saturated with flammable methane. More than a year later, the agency rescinded its mandate and refused to explain why."

"Leaked documents reveal the government has sought to change proposals that could prevent deepsea drilling operations."

"A storm moving up the Mississippi River valley will help replenish the river, low in parts from drought, and ease concerns that shipping could be halted along a shallow stretch from St. Louis to Cairo, Illinois."

After years of disagreement, planners from California and Nevada seem to have finally agreed on a plan that will allow development while protecting Lake Tahoe's crystalline waters.

"AUSTIN, Tex. — There is usually no shortage of controversial and politically divisive issues for lawmakers to address in the opening days of a state legislative session, from abortion to immigration to gun rights. But throughout the opening of the 83rd Texas Legislature last week, one of the most frequently discussed topics had bipartisan support: improving the state’s water infrastructure as the population booms and a devastating two-year drought drags on."

"Lifeboats from an oil rig that was temporarily grounded on a small island in southern Alaska may have leaked as much as 272 gallons of diesel fuel into pristine waters along the shoreline, but that cannot be determined until a full inspection is completed, U.S. Coast Guard officials said."

"The dozen trapped orcas swam free after changing weather conditions cracked the sea ice in northern Canada."

"Inuit people call for Canadian government to send icebreaker to free pod of mammals that are struggling to surface for air."

"New national drinking water rules are expected to lead to fewer dangerous pathogens coming out of the tap. The new regulation, which was announced last month and takes effect within three years, switches focus to a type of bacteria that more accurately reflects the presence of pathogens that can make people sick."

"ANCHORAGE -- As response teams continued Tuesday to evaluate Royal Dutch Shell's once-grounded oil drilling rig, the Coast Guard, the Obama administration and U.S. Sen. Mark Begich all announced investigations or reviews taking a close look at Shell":

"Controversial environmental activist Paul Watson has stepped down as head of the Sea Shepherd Conservation Society after being named in a U.S. court order preventing him from approaching Japanese whaling fleets."

"A Japanese-led team of scientists has captured on film the world's first live images of a giant squid, journeying to the depths of the ocean in search of the mysterious creature thought to have inspired the myth of the 'kraken', a tentacled monster."

The U.S. Supreme Court agreed Friday to take up the controversy of the thirsty Fort Worth area's bid to get water from Oklahoma.

"ANCHORAGE, Alaska -- Efforts to pull the Shell drilling rig Kulluk from its near-shore perch on rocks and gravel moved ahead mainly in secret Saturday, though officials disclosed Alaska has approved a tow plan to a temporary destination in nearby safe waters and that towing could be attempted at any time."