The federal Energy Policy Act of 2005 contained a provision that has come to be known as the "Halliburton Loophole," an exemption for gas drilling and extraction from requirements in the underground injection control (UIC) program of the Safe Drinking Water Act (SDWA). Other exemptions are also present in the Clean Air Act and Clean Water Act.
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http://www.independentwatertesting.c...-loophole.html