California Code, Health and Safety Code - HSC § 117950

(a) Each large quantity generator, except as specified in subdivisions (b) and (c), shall register with the enforcement agency prior to commencement of the generation of medical waste.

(b) Large quantity generators operating as a business in the same building, or that are associated with a group practice in the same building, may register as one generator.

(c) Large quantity generators as specified in subdivision (a), operating in different buildings on the same or adjacent property, or as approved by the enforcement agency, may register as one generator.

(d) “Adjacent,” for purposes of subdivision (c), means real property within 400 yards from the property boundary of the primary registration site.All federal transportation requirements specified in Section 173.6 of Part 49 of the Code of Federal Regulations shall apply for purposes of transporting medical waste from adjacent properties.