Sewage seeps into California beach city from Mexico, upending residents’ lives: “Akin to being trapped in a portable toilet”

California resident Shannon Johnson lives a few blocks from Imperial Beach’s turquoise water and waves of “perfect little curls” — but Johnson and her two young children haven’t stepped foot on the sand in a year.”Every time we go by the beach they’re asking, ‘Is it going to be clean? When are they going to fix it?'” said Johnson, 45, an activist with the Surfrider Foundation, who has been living in Imperial Beach, a small coastal city of 26,000 people 20 minutes from San Diego, since 2010.Heavy metals, toxic chemicals and bacteria including E. coli have been detected in the water,…