U.S. EPA's Office of Inspector General has published a "project notification" indicating that it too wants to get in on the activity: "The OIG's objective is to evaluate how the EPA and states have used their existing authorities to regulate hydraulic fracturing impacts to water resources. In meeting this objective, we will determine and evaluate what regulatory authority is available to the EPA and states, identify potential threats to water resources from hydraulic fracturing, and evaluate the EPA's and states' responses to them."
For a copy of the notice, see here (dated Feb. 5, 2014).