A celebrity-studded, water-strapped region on the western edge of Los Angeles County has cleared a major hurdle for the construction of a water purification facility that officials say will help reduce local dependence on supplies imported from Northern California. The board of the Las Virgenes-Triunfo Joint Powers Authority this week approved a final impact report for the proposed Pure Water Project at 30800 Agoura Road in Agoura Hills — a facility that would purify the millions of gallons of treated wastewater that are used for irrigation or flushed into the Pacific Ocean.