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The EPA took another step toward tightening oversight of hydraulic fracturing today, announcing it would initiate a process to set national rules for treating wastewater discharged from gas drilling operations. Until now, the agency has largely left it to states to police wastewater discharges. Some have allowed drillers to pump waste through sewage treatment plants that aren't equipped to remove many of the contaminants, leading to pollution in some rivers and to problems at drinking water facilities.

More than 6,000 chemicals pollute U.S. drinking water, yet the U.S

NEW YORK (Reuters Health) - People drinking water naturally contaminated with high levels of arsenic may benefit from eating more radishes, sweet potatoes and other similar plants, a new study finds.