California Code, Health and Safety Code - HSC § 1685

The governing body of a city, county, city and county or school district may employ one or more school audiometrists, each of whom shall be registered with the State Department of Health Services and possess such qualifications as may at the date of registration be prescribed by the state department.

Audiometric testing as conducted by the qualified school audiometrist, pursuant to Section 13300 of the Education Code, or by other qualified certificated school personnel, as defined in Sections 11751 and 11824 of the Education Code, shall meet the standards which the State Department of Health Services determines necessary to insure the adequacy of hearing testing in the schools.  Subject to Section 11822 of the Education Code, audiometric tests may be administered to school and preschool children in school buildings and other places as are or may be used by schools, health departments or other agencies that provide qualified personnel to conduct such tests.