CHEYENNE, Wyo. -- The U.S. Geological Survey plans to release results Wednesday from new groundwater tests in Wyoming where another agency linked hydraulic fracturing to contaminants found in two water wells and residents complained of chemicals polluting their well water.
The new USGS data come from samples taken in April at one of the test wells near Pavillion in central Wyoming. The other test well didn't produce enough water to yield samples deemed large enough to test.
Hydraulic fracturing, or fracking, is the petroleum industry practice of pumping water, sand and chemicals down well bores to crack open fissures and boost the flow of oil and gas.
Environmental groups have sounded the alarm about fracking for years -- but with few, if any, examples of verified pollution. Petroleum industry officials say the lack of verified pollution, out of many thousands of wells fracked in the U.S. over the past few decades, proves the process is safe.