The EPA, headed by Gina McCarthy, says strontium, which can reduce bone strength among those deficient in calcium, is the latest contaminant to be targeted under the 1974 Safe Drinking Water Act. (Associated Press Photographs)
President Barack Obama jokes with Environmental Protection Agency Administrator Gina McCarthy and EPA staff members who worked on the power plant emissions standards, in the Rose Garden of the White House, June 2, 2014. (Official White House Photo by Pete Souza)
Environmental Protection Agency (EPA) Administrator Gina McCarthy holds up a pen before signing new emission guidelines during an announcement of a plan to cut carbon dioxide emissions from power plants by 30 percent by 2030, Monday, June 2, 2014, at EPA headquarters in Washington. In a sweeping initiative to curb pollutants blamed for global warming, the Obama administration unveiled a plan Monday that cuts carbon dioxide emissions from power plants by nearly a third over the next 15 years, but pushes the deadline for some states to comply until long after President Barack Obama leaves office. (AP Photo/ Evan Vucci)
Retired coal miner Stanley Sturgill of Harlan County, Kentucky, testifies that coal fired power plants are a danger to public health, on the first of two days of public hearings held by the Environmental Protection Agency on President Barack Obama's plan to cut carbon dioxide emissions by 30 percent by 2030, in Denver, Tuesday, July 29, 2014. In hearings, hundreds of people across the country are telling the EPA its new rules for power-plant pollution either go too far or not far enough. (AP Photo/Brennan Linsley)
Sierra Club volunteer Alex Burke organizes signs to hand out near the local Environmental Protection Agency offices, on the first of two days of public hearings held by the EPA on President Barack Obama's plan to cut carbon dioxide emissions by 30 percent by 2030, in Denver, Tuesday, July 29, 2014. In hearings, hundreds of people across the country are telling the EPA its new rules for power-plant pollution either go too far or not far enough. (AP Photo/Brennan Linsley)
Environmental Protection Agency Administrator Gina McCarthy said the agency is considering a ban on certain hydrofluorocarbons (HFCs), used in many industrial and consumer products, as part of the Obama administration's climate change efforts. The Clean Air Act allows the agency to restrict certain pollutants if there are available alternatives, though no HFC alternatives have been suggested. (Associated Press)
Rep. Tom Graves, Georgia Republican, proposed an amendment as a police rider on a $30.2 billion spending bill for natural resources agencies that would block the Environmental Protection Agency from garnishing wages to collect fines from Americans without a court order. Some Republican senators have demanded the EPA immediately withdraw the rule.