Data on 216 state psychiatric hospitals were analyzed to determine whether accreditation by the Joint Commission on Accreditation of Healthcare Organizations (JCAHO) or certification by the Health Care Financing Administration (HCFA) were related to seven hospital characteristics generally accepted as reflecting quality of care. The characteristics were average cost per patient, per diem bed cost, total staff hours per patient, clinical staff hours per patient, percent of staff hours provided by medical staff, bed turnover, and percent of beds occupied. While a majority of the hospitals had either JCAHO accreditation, HCFA certification, or both, analysis revealed a weak relationship between accreditation or certification status and the indicators of quality of care. Accredited or certified hospitals were, however, more likely to have higher values on specific indicators than hospitals without accreditation.