El Dorado County Emergency Services Authority Share: Ambulance Service Visit Website Request Info 480 Locust Road Diamond Springs, CA 95619 (530) 642-0622 LinkedIn Facebook About Map About The EDC ESA coordinates the daily operational management of the fire based pre-hospital emergency medical ambulance and dispatch services for the Western Slope of the County. What's Nearby? Distance: 5 10 15 20 25 50 mi.