CA Gov't Code Section 66477.1

(a)

At the time the legislative body or the official designated pursuant to Section 66458 approves a final map, the legislative body or the designated official shall also accept, accept subject to improvement, or reject any offer of dedication. The clerk of the legislative body shall certify or state on the map the action by the legislative body or designated official.

(b)

The legislative body of a county, or a county officer designated by the legislative body, may accept into the county road system, pursuant to Section 941 of the Streets and Highways Code, any road for which an offer of dedication has been accepted or accepted subject to improvements.