Cal. Gov. Code § 6509.6

Notwithstanding any other law, a joint powers authority created pursuant to this chapter may purchase or acquire, by sale, assignment, pledge, or other transfer from a local agency, and any local agency may sell, assign, pledge, or transfer to a joint powers authority any or all of that local agency’s right, title, and interest in and to an assessment contract authorized by Chapter 29 (commencing with Section 5898.10) of Part 3 of Division 7 of the Streets and Highways Code, including any related lien, right, subsidy, or other right and receivable, and the enforcement and collection thereof, pursuant to any terms and conditions agreed to between the joint powers authority and the local agency.