Many of us have seen beaches forced to close due to bacteria in the water that often flows from the San Diego River. It's why people are advised to avoid swimming for about 72 hours after a big rainstorm. "Many people may not know that the beach closures are because of really high levels of fecal bacteria in the water," said Natalie Mladenov, a professor of environmental engineering at San Diego State University and head author on the study. Researchers at SDSU found the bacteria was mainly from leaking sewer pipes and not homeless encampments or septic tanks as some people had once thought. Full story on CBS8.com: https://www.cbs8.com/article/news/local/leaking-sewer-is-polluting-the-san-diego-river-closing-beaches/509-7e0b7df5-6452-4f16-bb1a-439d38f4de00