An internationally recognized purification system credited with turning wastewater into drinkable water in Orange County will begin the final stage of expansion with a $124 million investment from the U.S. Environmental Protection Agency, officials announced Wednesday, July 19. The expansion of Orange County’s Groundwater Replenishment System will allow it to grow by 30 million gallons per day, to a total of 130 million gallons that will provide nearly half of Orange County communities with 85 percent of their water.