The City of Chico detected dangerous levels of E. coli this week in Sycamore Pool in Chico's Lower Bidwell Park. It's been an ongoing issue since last summer when several people got sick, claiming it was a result of swimming in the pool. The city has been monitoring levels with frequent testing, moving to daily tests at the end of June of this year. On Monday, city testing found the highest levels recorded this summer. Park Director Shane Romain said testing done Wednesday detected much lower levels of E. coli which falls under a swim advisory. He said the city will wait until Thursday's results come back before making the decision to officially put out new recommendations.