The Mission grounds include the Lavanderia, site registered at the archaeological survey office at the University of California at Los Angeles, and given the permanent trinomial designation Sdi241. 

The Lavanderia was a bathing site and place for washing clothes. 

Additionally, the structure provided a means of channeling water into the Mission garden and fields for irrigation.  It was an extensive water conservation system. 

This site used by the early Indians needs restoration.