California Code, Revenue and Taxation Code - RTC § 647

(a) If any city or lighting, water, or irrigation district, or any district described in Section 2131, on behalf of which the county does the assessing, makes written request, on or before the lien date, for a certified copy of the portion of the secured roll pertaining to property within its limits, the assessor shall comply with the request on or before July 1. Such roll is at all times, during office hours, open to the inspection of any person representing any taxing agency or revenue district, or any district described in Section 2131.

(b) In counties of the first class, if any city or lighting, water or irrigation district, on behalf of which the county does the assessing, makes written request, on or before the lien date, for a certified copy of the portion of the secured roll pertaining to property within its limits, the assessor shall comply with the request on or before the third Monday in August.