JEKYLL ISLAND — The underground aquifer that coastal Georgia relies on for its main source of drinking water was considered so pristine that state lawmakers 15 years ago declared it off-limits to well drillers looking for a place to stash extra water for use in periods of drought. That's not the case anymore. The moratorium imposed to protect the Floridan aquifer in 11 Georgia counties, those along and closest to the state's 100-mile coast from Savannah to St. Marys, lapsed July 1 after an attempt in the Legislature to make the regional ban permanent was put on hold.