Cal. Public Resources Code § 40001

(a) The Legislature declares that the responsibility for solid waste management is a shared responsibility between the state and local governments. The state shall exercise its legal authority in a manner that ensures an effective and coordinated approach to the safe management of all solid waste generated within the state and shall oversee the design and implementation of local integrated waste management plans. (b) The Legislature further declares that it is the policy of the state to assist local governments in minimizing duplication of effort, and in minimizing the costs incurred, in implementing this division through the development of regional cooperative efforts and other mechanisms which comply with this division. (c) The Legislature further declares that market development is the key to successful and cost-effective implementation of the 25-percent and 50-percent diversion requirements required pursuant to Section 41780, and that the state must take a leadership role, pursuant to Chapter 1 (commencing with Section 42000) of Part 3, in encouraging the expansion of markets for recycled products by working cooperatively with the public, private, and nonprofit sectors.