(1) The person in charge of a mobile food unit shall use the commissary approved by the regulatory authority issuing the mobile primary permit unless exempted under RCW 43.20.148.

(2) The regulatory authority must approve a request for a mobile food unit to be exempt from this chapter or regulatory authority requirements to operate from an approved commissary or servicing area if:

(a) The mobile food unit contains all equipment and utensils needed for complete onboard preparation of an approved menu;

(b) The mobile food unit is protected from environmental contamination when not in use;

(c) The mobile food unit can maintain required food storage temperatures during storage, preparation, service, and transit;

(d) The mobile food unit has a dedicated handwashing sink to allow frequent handwashing at all times;

(e) The mobile food unit has adequate water capacity and warewashing facilities to clean all multiuse utensils used on the mobile food unit at a frequency specified in this chapter;

(f) The mobile food unit is able to store tools onboard needed for cleaning and sanitizing;

(g) All food, water, and ice used on the mobile food unit are prepared onboard or otherwise obtained from approved sources;

(h) Wastewater and garbage will be sanitarily removed from the mobile food unit following an approved written plan or by a licensed service provider; and

(i) The local health officer approves the menu and plan of operations for the mobile food unit.