CA SB443

Defines "level of prehospital EMS" as the quantity of available staff, vehicles, and equipment, and the character of EMS services including basic life support, advanced life support, or limited advanced life support.

Requires cities or fire districts that provided prehospital EMS as of June 1, 1980 to retain their authorities and administration of EMS when entering joint exercise of powers agreements with counties or ceasing EMS provision due to the City of Oxnard v. County of Ventura court decision.

Clarifies that entering into written agreements with counties does not make cities or fire districts ineligible to retain EMS authorities or result in transfer, termination, or extinguishment of their EMS administration rights.

Restricts local EMS agency medical control authority by prohibiting them from limiting public safety agencies' ability to receive and process 911 emergency requests within their territorial jurisdiction.

Specifies that local EMS agencies cannot unilaterally reduce public safety agency response modes, prevent public safety responses, alter deployment of emergency resources, or prevent mutual aid under the California Emergency Services Act.