The discovery was made at the Hill Canyon Wastewater Treatment Plant at 9600 Santa Rosa Road. The gated facility, located in a remote area surrounded by hills and hiking trails, serves the city of Thousand Oaks.
Authorities responded at about 8:45 a.m. after a plant worker discovered the fetus, said Deputy Chris Dyer.
Authorities are asking for the public's help if anyone has information related to the case.