Imperial Beach Mayor Serge Dedina points towards a beach that was closed due to sewage water contamination as it flowed from Tijuana, Mexico, behind, through the Tijuana River, left, and out to sea Friday, March 3, 2017, in Imperial Beach, Calif. Dedina has called it, "the tsunami of sewage spills." For more than two weeks last month, a stench of feces, ammonium and laundry detergent wafted through the air in Imperial Beach. Sewer repair work in Tijuana, caused an estimated 143 million gallons to spill into the United States and the Pacific Ocean for 18 days. A Mexican official challenged those findings on Friday after a week of public uproar. (AP Photo/Gregory Bull)