21 of 31 drilling states have no regulations specific to hydraulic fracturing
4 of 31 drilling states have detailed regulations guiding hydraulic fracturing
10 drilling states surveyed require that fracturing chemicals be disclosed
0 states require that the volume of fluid left underground be recorded
Sources: State Oil and Natural Gas Regulations Designed to Protect Water Resources, May 2009, U.S. Department of Energy, office of Fossil Energy, National Energy Technology Lab, and the Ground Water Protection Council.