SAN DIEGO — Homeownership remained out of reach for most San Diego County households during the second quarter, despite housing affordability holding steady from the previous quarter, according to a report released today by the California Association of Realtors. In San Diego County, 17% of households could afford to purchase the county’s median-priced single-family home of $1.075 million during the second quarter, the same as the first quarter and up from 16% a year earlier, the association said. “Despite improving from a year earlier, affordability remains near historic lows as elevated housing costs and borrowing expenses continue to limit homeownership opportunities across many California communities,” the report said. Statewide, housing affordability fell to 19% in the second quarter from a four-year high of 22% in the first quarter as mortgage rates climbed and home prices rebounded. The statewide median home price rose to $916,750, requiring a minimum annual income of $228,400.