The state inspector general says in a report released Monday that the California Medical Facility in Vacaville failed on half of 14 key benchmarks.
He cites poor nursing care and a recent policy change that means there are no doctors at the facility after normal hours.
The 61-year-old facility provides medical and psychiatric care to more than 2,500 sick inmates, including hospice care for the terminally ill.
It was recently in the news because of a dispute over whether a mentally ill prisoner essentially starved to death.
Inspectors say more than a third of the 22 prisons inspected since last year still provide inadequate care.
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