A new report finds the dirtiest beach in San Diego County this year is Cardiff State Beach in Encinitas. The report comes from the San Diego Coastkeeper and The Surfrider Foundation of San Diego County. The groups say volunteers at beach clean-up events each collected an average of just over 4 pounds of trash at Cardiff. The cleanest beach was La Jolla Shores, with about a half-pound of refuse per volunteer. Cardiff takes over the dubious top spot from last year's dirtiest, Mission Beach.