California Code, Health and Safety Code - HSC § 125850

(a) The Legislature finds and declares as follows:

(b) No city, county, or city and county ordinance, regulation, or administrative action shall prohibit or restrict the practice of male circumcision, or the exercise of a parent's authority to have a child circumcised.

(c) The Legislature finds and declares that the laws affecting male circumcision must have uniform application throughout the state. Therefore, this part shall apply to general law and charter cities, general law and charter counties, and charter city and counties.