San Mateo County’s overcrowded jails will continue to swell if a new facility isn’t built soon, a new grand jury report warns.

The report, released Monday, says the county will struggle to rehabilitate inmates and will end up paying millions more dollars in the long run if a new, large facility is not built immediately. The women’s facility on Maple Street is packed too tight with inmates, says grand jury foreman Gerald Yaffee, who recently toured the facility.

The county’s jails house 45 percent more inmates than the design capacity, the report says.

maldax@sfexaminer.com