Contra Costa County Grand Jury • 2026-2027

The Cost of Adult Detention Facilities

Published: May 14, 2026 22 pages
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Findings and Recommendations 6 findings

F1
The Sheriff’s Quarterly Oversight Report to the Board of Supervisors regarding the cost of detention borne by the Sheriff’s Department does not include costs borne by other County departments, such as the costs of medical and mental health services.
Related Recommendations (1)
R1
By January 1, 2027, the Board should consider requiring an audit to determine the full costs of adult detention facilities.
F2
In 2025, the average daily cost to detain an adult in custody at the County’s three detention facilities, including mental and medical services, was $396.
Related Recommendations (1)
R2
Upon completion of the audit and no later than June 30, 2027, the Board should consider directing the auditor to report on the review of the full costs of operating each of the adult detention facilities.
F3
At $627 per day, Marsh Creek Detention Facility (MCDF) costs more to house inmates than Martinez Detention Facility ($511) or West County Detention Facility ($278).
Related Recommendations (1)
R3
By October 31, 2026, the Sheriff’s Office should consider clarifying in its Quarterly Oversight Report that the detention costs reflect only the Sheriff’s Office costs.
F4
MCDF operates at 20% of its capacity.
Related Recommendations (1)
R4
By January 1, 2027, the Board should consider directing the Sheriff’s Office and the County Administrator’s Office to identify a methodology for determining and reporting the full costs of the adult detention facilities operated by Contra Costa County.
F5
The Custody Alternative Facility (CAF) does not separately report the costs of the programs it administers: Sheriff’s Work Alternative Program, Secure Continuous Remote Alcohol Monitoring, and Electronic Home Detention.
Related Recommendations (1)
R5
By July 1, 2027, the Board should consider directing the Sheriff’s Office to close MCDF.
F6
The most recently available Sheriff’s Community Transparency Portal does not report the costs to manage the adult detention facilities.
Related Recommendations (1)
R6
By December 31, 2026, the Board should consider directing the Sheriff’s Office to collect and report operating cost data separately for each CAF program.

In the News 1

News coverage of this report, automatically tracked.

Grand Jury: Contra Costa Jails Cost Nearly $145,000 Per Inmate Annually, Recommends Closure Of Marsh Creek Detention Facility
CLAYCORD · June 2, 2026