 John Kennedy is the general manager of the Orange County Water District. When you flush your toilet, you take a shower, you clean your clothes, wash the dishes, you're generating wastewater or sewage. Orange County, California is home to the largest groundwater replenishment system in the world. Every day, treated wastewater that would normally drain into the Pacific Ocean goes through a three-step purification process, including microfiltration, reverse osmosis, and ultraviolet light.