The Orange County Water District’s Groundwater Replenishment System Prevented Beach Closures During Recent Heavy Rains

The Groundwater Replenishment System (GWRS), the world’s largest advanced water purification facility of its kind, has been online since January 2008. The project is a joint partnership between the Orange County Water District (OCWD; the District) and the Orange County Sanitation District (OCSD). On January 22-23, 2017, OCSD saw influent flows that had not been seen since 1995. OCSD experienced peak flows of up to 586 million gallons per day (mgd) coming into both of their wastewater treatment plants.