Human contact with the water is prohibited at the discretion of the Board of Directors at the Casitas Municipal Water District. The Board states that since the Lake is used for drinking water body contact with water is not allowed, but fishing, boating and camping are permitted. During the 1984 Summer Olympics in Los Angeles, Lake Casitas hosted the canoeing and rowing events. The lake was used as the site for filming the scenes of 'Camp Greenlake' in the 19th century. The lake featured in the 2003 film Holes.
The "No Body Contact with Water" Lake Policy is created by elected officials at The Casitas Municipal Water District; the Casitas Municipal Water District Board of Directors. The existing "no body contact with water" regulation was established in the 1950's and 1960's because the lake did not have a filtration system in place. In the 1990's a multi-million dollar filtration system upgrade was made to the Lake Casitas facility. The US Department of the Interior conducted a 10-year study on the Lake where allowing body contact with water was explored. The study reported, "The capabilities of the current water filtration system to handle the additional burden of body contact were called into question. The system was shown to exceed current regulatory standards, and would “probably” be sufficient enough to mitigate body contact pollution as well" (Lake Casitas Resource Management Plan http://www.usbr.gov/mp/nepa/documentShow.cfm?Doc_ID=5268). The Casitas Municipal Water District has not significantly changed the legacy "no body contact with water" regulations in light of the facilities upgrade.