No person shall maintain or operate in or upon the navigable waters of any lake, reservoir, or fresh water impoundment of this state any vessel that is equipped with a toilet unless the toilet is sealed or otherwise rendered inoperable or designed so that no human excreta can be discharged into the waters.
Source:
Section 117505, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=HSC§ionNum=117505..