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The Potomac River's drinking water is safe, but chemicals in the river are raising concerns among water quality experts.
The U.S. Environmental Protection Agency says releases of toxic air pollutants were down in 2011 in the Mid-Atlantic.
An ongoing U.S. Environmental Protection Agency study on natural gas drilling and its potential for groundwater contamination has gotten tentative praise so far from both industry and environmental groups.
A federal judge has ruled that the Environmental Protection agency exceeded its authority by attempting to regulate stormwater runoff into a Fairfax County creek as a pollutant.
The Obama administration is temporarily waiving some Clean Air Act requirements in 16 states and the District of Columbia to reduce fuel disruptions from Superstorm Sandy.
The U.S. Navy has agreed to pay $38,500 to settle alleged hazardous waste violations at the Naval Air Station Patuxent River.