Regional Ground and Surface Water Enhancement Program Act of 2007 - Amends the Food Security Act of 1985 to direct the Secretary of Agriculture to: (1) identify areas in which protecting or improving water quality or water quantity, or both, is a priority; (2) establish (within the environmental quality incentives program) a regional water enhancement program to improve agricultural water quality or water quantity; and (3) invite prospective partners to submit competitive grant proposals for regional water enhancement partnerships.