California Code, Government Code - GOV § 7295

Any materials explaining services available to the public shall be translated into any non-English language spoken by a substantial number of the public served by the agency.  Whenever notice of the availability of materials explaining services available is given, orally or in writing, it shall be given in English and in the non-English language into which any materials have been translated.  The determination of when these materials are necessary when dealing with local agencies shall be left to the discretion of the local agency.