California Code, Health and Safety Code - HSC § 117725

(a) “Medical waste treatment facility” means all land and structures, and other appurtenances or improvements on the land under the control of the treatment facility, used for treating medical waste offsite from a medical waste generator, including all associated handling and storage of medical waste as permitted by the department.

(b) For purposes of this section, land is under the control of the treatment facility if it is owned, rented, or controlled by contractual agreement.