Science

UTA Survey of Barnett Shale Water Wells Finds Contaminant Levels Highest Near Fracking

The question Dr. Kevin Schug set out to answer was refreshingly simple: Does drilling activity in the Barnett Shale contribute to groundwater contamination? There is no shortage of assurances of safety from industry, or claims of mysterious illness from aggrieved landowners and environmental types. So, Schug and a fellow researcher at the University of Texas at Arlington, Dr. Brian Fontenot, decided to let science sort it out in 2011. In a study that is the first of its kind in the Barnett, the researchers tested 100 private water wells in a 13-county area. Some were located at various distances from natural gas wells. Others were completely outside of the Barnett Shale.

They analyzed the groundwater for arsenic, heavy metals and compounds commonly found in the concoction of chemicals, fine sand and water blasted thousands of feet beneath the surface at enormous pressures. Many of these contaminants occur naturally in the Barnett Shale. But on average, they were found in high concentrations in the water wells nearest drilling activity. In the study's active drilling-area, arsenic was detected in 29 water wells at levels exceeding federal limits. "It was clear in times where we found really high arsenic levels, you're up close to a wellhead," Schug tells Unfair Park.

Though the study, published last week in the journal Environmental Science & Technology, identified a correlation, Schug is quick to point out that they haven't singled out a mechanism for what could be causing the contamination. It could be a failure in the casing designed to protect groundwater. Mechanical vibrations might be disturbing particles in neglected water well equipment. Perhaps it's the lowering of the water table by the fracking process.

"I think our biggest conclusion is that more work needs to be done," Schug says.

One of the obstacles to this study was a lack of baseline data on contaminant levels before drilling began. Schug had to rely on historical data from the Texas Water Development Board. That's why he's so excited about the next phase of his research. Drilling in the Permian Basin's Cline Shale is ramping up. Schug and his colleagues were able to sample 60 wells before fracking operations began. They've gathered the kind of baseline data that was impossible get in the Barnett. What they predicts is that it will give them a before-during-and-after picture of groundwater quality in a shale play.

"This time lapse is something people haven't been able to look at before," he says.

Given the "frackademia" scandals of late, including the University of Texas researcher who exonerated fracking while neglecting to mention his well-compensated membership to a major fracker's board of directors, it's worth noting that this UTA study took no funding from either side of the aisle.

"Nobody could align us with the industry or the environmentalists, and assign us one agenda or another," he said.

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Brantley Hargrove