Section 114221 Of Article 3. Mobile Water And Wastewater Tanks From California Health And Safety Code >> Division 104. >> Part 7. >> Chapter 7. >> Article 3.

. (a) Water tanks shall be designed with an access port for inspection and cleaning. The access port shall be in the top of the tank and flanged upward at least one-half inch and equipped with a port cover assembly that is provided with a gasket and a device for securing the cover in place and flanged to overlap the opening and sloped to drain.
  (b) Notwithstanding subdivision (a), water tanks that are not accessible for inspection may comply with this section by submitting written operational procedures for the cleaning and sanitizing of the potable water tank. The enforcement agency shall review and approve the procedures prior to implementation and an approved copy shall be kept on the mobile food facility during hours of operation.