(a) A mobilehome park that provides water service only to its tenants from water supplies and facilities that it owns, not otherwise dedicated to public service, is not a water corporation. However, that mobilehome park is subject to the jurisdiction of the commission to the extent that, if a tenant complains about the water rates charged or service provided by the mobilehome park, the commission shall determine, based on all the facts and circumstances, whether the rates charged are just and reasonable and whether the service provided is adequate.
(b) Complaints filed pursuant to subdivision (a) are subject to the provisions of this code and to the Rules of Practice and Procedure of the commission governing complaints and commission investigations.
(c) The commission may afford rate relief or may order the mobilehome park to improve its water supply, facilities, and services on those terms that it finds just and reasonable, or both.
(d) The public adviser created pursuant to Section 321 and necessary staff of the commission shall assist the complainant.