Founded in 1948 Riggs Ambulance Service Riggs Ambulance Service is a CAAS accredited, High quality emergency medical services provider in the Central Valley of California. As the exclusive ALS, BLS, CCT and Air Medical provider in Merced County, Riggs Serves a population of over 250,000 residents plus guest encompassing over 2,087 square miles. Visit our website at www.RiggsAmbulance.com to learn more about our organization and to search our current career opportunities.