Note: The information presented in the above maps is updated daily and reflects confirmed CSO and diversion activity based on the best available data. Not all CSO outfalls are equipped with monitoring equipment. Therefore, other CSOs may have occurred that are not reflected on the above map. Regardless of CSO activity, the Chicago Area Waterways may contain disease-causing bacteria at any time.  Therefore, swimming, canoeing, or other activities where immersion in water is possible should be avoided and is not recommended, particularly during and immediately following rainfall.