California Code, Health and Safety Code - HSC § 114353

(a) Except as provided in subdivision (b), a temporary food facility shall provide only single-use articles for use by the consumer.

(b) Notwithstanding subdivision (a), based on local environmental conditions, location, and similar factors, including the type and number of utensils, as defined in Section 113934, the volume and storage of potable water for warewashing, as defined in Section 113940, and waste water capacity, storage, and disposal, the local enforcement agency may allow a temporary food facility to use multiuse utensils that have been properly washed, rinsed, and sanitized pursuant to Chapter 5 (commencing with Section 114095), as applicable, at an approved food facility and are kept free of becoming soiled or contaminated.