The ongoing deluge of sewage from Mexico has polluted the waters off Coronado, rendering them unsafe for swimmers. TC2412 - stock.adobe.com They’re up s–t creek without a plunger. Just when you thought it was safe to get back in the water: A picturesque California beach is at risk of being shuttered amid a deluge of sewage from Mexico that’s befouled the coastline. “It was heaven on Earth, and now I call it paradise lost,” Whitney David, 63, a retired surgeon and surfer, told the WSJ of the odiferous scourge. Posted signs at Coronado Beach warn the public of the pollution. The San Diego Union-Tribune via Getty Images Located off the coast of San Diego Bay, the upscale resort city of Coronado has long been a mecca for bathers. However, recently the region has been polluted by gallons of wastewater — as many as 38 million per day — from our neighbor to the South, which has increasingly rendered this idyllic seaside hub off-limits.…