the european union has adopted a recommendation for minimum principles for using high-volume hydraulic fracturing. its regulatory regime requires full disclosure of all additives. in the united states, the ground water protection council launched fracfocus.org, an online voluntary disclosure database for hydraulic fracturing fluids funded by oil and gas trade groups and the u.s. department of energy. hydraulic fracturing is excluded from the safe drinking water act's underground injection control's regulation, except when diesel fuel is used. the epa assures surveillance of the issuance of drilling permits when diesel fuel is employed.