The woman's boyfriend, Taquan Maldonado, 35, was arrested on suspicion of killing her and was taken to Santa Rita jail in Dublin.
Sheriff's deputies have been called to the home in the 21000 block of Eden Canyon Road numerous times for domestic violence and other disturbances.
The woman's death was reported at about 3:10 p.m., sheriff's Sgt. J.D. Nelson said. Other people also were at or near the home in unincorporated Alameda County when the woman died, he said. She was stabbed in her torso.
Anyone with additional information about the stabbing is asked to call Detective Pat Smyth at (510) 667-7538.