California Code, Health and Safety Code - HSC § 25510.3

The emergency response personnel, responding to the reported release or threatened release of a hazardous material, or of a regulated substance, as defined in Section 25532, or to any fire or explosion involving a material or substance that involves a release that would be required to be reported pursuant to Section 25510, shall immediately advise the superintendent of the school district having jurisdiction, if the location of the release or threatened release is within one-half mile of a school.