California Code, Public Contract Code - PCC § 22150

(a) If fitness and quality are equal, each local public entity shall purchase recycled products, as defined in Section 12200, instead of nonrecycled products whenever recycled products are available at the same or a lesser total cost than nonrecycled items.

(b) A local public entity may give preference to suppliers of recycled products.

(c) A local public entity may define the amount of this preference.