California Code, Harbors and Navigation Code - HNC § 777

(a) Vessel pumpout facilities for the transfer and disposal of sewage from marine sanitation devices, floating restrooms, and onshore toilets shall be operated and maintained in a manner that will prevent the discharge of any sewage to the waters of the state and shall be maintained in good working order and regularly cleaned.

(b) Every vessel pumpout facility shall have a notice posted on the facility identifying the city, county, local public health officer, or boating law enforcement officer responsible for enforcing this chapter pursuant to Section 779, with the telephone number where a violation of subdivision (a) may be reported.

(c) Any violation of this section is a misdemeanor.  In addition, any violation of this section is subject to any remedy provided for in Chapter 5 (commencing with Section 13300) of Division 7 of the Water Code.