That’s according to the U.S. Environmental Protection Agency’s annual evaluation of how the Texas Railroad Commission oversees thousands of injection and disposal wells that dot state oilfields — underground resting places for millions of gallons of toxic waste from fracking and other drilling activities.
“In light of findings from several researchers, its own analysis of some cases and the fact that earthquakes diminished in some areas following shut-in or reduced injection volume of targeted wells,” the Aug. 15 report states, “EPA believes there is a significant possibility that North Texas earthquake activity is associated with disposal wells.”
Scientists have known for decades that injecting fluid deep underground could trigger earthquakes, and a growing body of research has linked disposal wells to seismicity in Texas and other states, which has grown more frequent.
Jim Bradbury, a Fort Worth-based oil and gas attorney who has closely followed the earthquake saga, said he could not recall the EPA explicitly tying Texas earthquakes to industry activity.
"It's a big deal they said that," he said.
Texas, home to thousands of such wells, is the third-most at-risk state for man-made earthquakes, according to the U.S. Geological Survey — behind only Oklahoma and Kansas.
Several Texas drilling regions have recently felt more earthquakes, most of them small. But temblors in the Dallas-Fort Worth area have drawn the most attention, particularly those that struck in the past two years.
“EPA is concerned with the level of seismic activity during 2015 in the Dallas/Ft. Worth area because of the potential to impact public health and the environment, including underground sources of drinking water,” the agency wrote.
The shaking has created political challenges for the Texas Railroad Commission, which oversees the powerful oil and gas industry.
Since 2014, the agency has added a staff seismologist and approved regulations requiring disposal well operators to submit more geographical information. But the agency, which has conducted its own investigations, has not publicly tied any of the shaking to industry activity — even as regulators in other petroleum states acknowledge a connection. The Railroad Commission has pushed back against conclusions of some outside studies.
Responding to the EPA report Monday, the commission told The Texas Tribune that it "takes the issue of induced seismicity very seriously and has in place some of the most stringent rules on disposal wells."
Since approving those 2014 rules, the commission has received 56 disposal well applications in historically seismic areas, spokeswoman Gaye McElwain said in an email. Of those, the agency has issued 28 permits with "special conditions" — those related to injection volumes and pressures, for instance. Eleven applications were withdrawn or returned, while three were protested and sent to hearings. "Ten permits were issued without special conditions, and four applications are pending," McElwain said.
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