The Mountain Recreation and Conservation Authority (MRCA) operates the recreation zones on a seasonal basis in cooperation with the City of Los Angeles, the County of Los Angeles, and the Army Corps of Engineers. There are two segments of the Recreation Zone: the 2-mile Sepulveda Basin River Recreation Zone and the 2.5 mile Elysian Valley River Recreation Zone. Both Recreation Zones are open sunrise to sunset daily for walking, fishing, and kayaking from Memorial Day to September 30 every year. For maps and guides and more information on the Recreation Zones see www.lariverrecreation.org.
LA Sanitation staff sample and test water twice a week at three locations in each Recreation Zone, corresponding to the beginning, middle, and end of each zone. Samples are tested in a laboratory for the presence of E. coli bacteria, and for each sample a resulting MPN (Most Probable Number) per 100 milliliters (mL) is determined. The bacteria results at each location are compared to State of California water quality standards for water contact recreation (REC-1 and Limited REC-1) to determine if the water quality, in each Recreation Zone, is suitable for recreational activities. Based on the bacteria levels found, the status of each recreation zone is determined and displayed on the table below according to the following color code:
The status of each Recreation Zone is based on the latest bacteria results, but bacteria levels in urban waters can be highly erratic and dependent on a multitude of human and non-human sources. Since elevated bacteria levels can occur at any time in the river, you should always follow these safe practices in order to minimize your risk of getting sick.