California Code, Health and Safety Code - HSC § 33214

(a) Notwithstanding Section 33120, the territorial jurisdiction of an agency in the county shall include all of the unincorporated territory that was included in a project area selected pursuant to Section 33322or 34004 even if that territory is subsequently annexed to a city or included within the boundaries of a new city, unless territorial jurisdiction over the project area is transferred from a county to a city pursuant to Section 33215,33216, or 33217.

(b) Notwithstanding Section 33120, the territorial jurisdiction of an agency in a city shall include all of the territory within the limits of the city that was included in a project area selected pursuant to Section 33322 or 34004 even if that territory is subsequently annexed to another city or included within the boundaries of a new city, unless territorial jurisdiction over the project area is transferred to the other city pursuant to Section 33215, 33216, or 33217.