The Orange County Health Care Agency has received 10 reports of acute hepatitis a virus (HAV) infection in Orange County residents since September 1, 2018. Median case age is 48 years (range 27-69 years); 5 females, 5 males; 50% self-report as Not-Hispanic or Latino/White. Eight of these cases reported no history of travel to areas with ongoing HAV transmission or exposure to a known case. One of the eight cases reported illicit drug use, none reported experiencing homelessness. No common social or geographic exposures have been identified. None report receiving hepatitis A vaccination in the past. Four cases with no history of travel have had genotyping performed, all were found to be infected with distinct HAV strains, indicating repeated introduction of HAV into the County.