The San Diego Regional Water Quality Control Board issued a permit Wednesday to develop and install permanent seawater intake and discharge facilities at the Claude “Bud” Lewis Desalination Plantin Carlsbad. The plant currently produces roughly 50 million gallons of potable water each day for use across San Diego County, but draws most of its water from the Agua Hedionda Lagoon, which is then circulated to the plant by the Encina Power Station.