Some San Diego County beach areas are closed to swimmers and surfers Monday because of high bacteria levels, according to county health officials. Water contact closures were issued for the following locations due to bacteria levels exceeding health standards: Imperial Beach shoreline from the south end of Seacoast Drive through north of Carnation Avenue Tijuana Slough ocean shoreline from U.S./Mexico border north, including Border Field State Park and the Tijuana Slough National Wildlife Refuge (due to cross-boundary flows Additionally, water contact advisories were issued for the following locations due to bacteria levels exceeding health standards: La Jolla, Children’s Pool Coronado, Avenida Lunar Coronado, Coronado Lifeguard Tower Mission Bay, Tecolote Shores swim area Mission Bay, Fiesta Island’s northwest shoreline More information on water contamination in San Diego County can be found here.